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Yanmar Yse Service Manual



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         ,:t
iIODEL
YSI
                                                                                                                                                    \
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                                                                        o'/-.u, (F",.^*.(r*/AJ,".,
                                                                                                .
                                                                                                   cr/ol -4"!cl,(                          .
                                                              CONTENTS

                                                                                                                                 Page

           1    ENGINE I\          PHOTOCRAPHS                                                                                        1
           2.   OUTST.{\DNG             FE.{TLRES OF YSE SERIES                                                                       2
           3.   GENER{L DESCRIPTTON                                                                                                   3
                                                                                                                                      3
                3.2      Po*er Take-off Shaft Pulleys                 ....                                                            5


j
          4.    P ERIODICAL          }LdII{TENANC E                                                                                   6
          5.    FUEL      ,\\D     LUBRICATING OILS                                                                                   7
                5. t     FuelOils                                                                                                     7
                         ;. 1. 1     Propert!      requirements                                                                       7




                                                                                                                                     7
                        5.2.2                                                                                                       -8
                                     Classification     by viscosity
                        5.2.3        R e c o m m e n d eDdl a n o s                                                                  I
          6.    TROUBLESHOOTING                                                                    .....,..,....,.,.                10 -
               6 .1     E n g i nD    e oes    \o1Start                                 . .,.,.,........,......                 10
               6.2      D i f f i c u l tS r a f i - u p . . . , .                            . . . , . . , , . . . . . , . . , 1l
               6.3      B a dE x h a u s       Ct o l o r                                                       ....,...I2                 '.
.   '=--,---6.4         M o m e n t a r lH i g h - s p e e d      Relolution ... . ..                           ,....,..        12
                6,5 Hunting                                                                         . . . , . .. . . . . . . . 1 2
                6 . 6 O u t p uD      t e c r e a s e.                                                ............. 13
                6. ? Knocking during Operation                                                                                  13                          ,
                6 . 8 S u d d eE        nn g i n S  etop                                          . .,........... . 14                                       l
                6.9 Lubricatin                Ogi l L e a k . . . . . .                             ......,....... 14                                       I
                6 . 1 0F u O      l i ll e a k . . .                                        ... .............. 14
                                                                                                - .
                6 . 1 1 W a t e rL e a k . . . . . .                                                                ..... . 15
                6 ,1 2 C o o l i n g   W a t e rF a i l u r e . .                                             .......,. 15
                6 . 1 3C l u t cS     hl i p . . . . . . . . . . . . .                          . . . . . . . . . . . . . . . .1 5
          7.    WEAR LIMIT OF EACH MAIN PAR'T                                                      ... ..,...........              TE
          8.             A N D s E R V r c r N do F M A I N p - { R T S . . . . - . - . - r i h . - . . . . . . . . . .
                INSPECTION                                                                                                         t7
                8;l     Fuel Injection Pump anclNozzle                                  . . . . , . , : , . . , . . . , , , . . . . . 17
                        8 .1 . 1    F u e li n j e c t i o p
                                                           nump                                ......... 77
                        8.1.2       Fuelinjectionnozzle(throttleno2z 1e1.,.,.,..,..................19
                        8.1.3       Air venting                      . . . . . . . . . . . , . . . . . . . . . . 21
                8 . 2 C o o l i nW
                                 g ater Pump                                                           .....,..22
                8.3 Cylinde       Hre a d                                               .-..-.-...-.........-..24

                                                                                                                                                    ,ta

                                                                                                                                                _       f
                                                                                       Page

           8.4    Piston and Connec t i n gR o d A s s e m b l y   .,...............    26
           8.5    Cylinder Liner                                                        30
           8.6    Crankshaft and Main Beafing Metal                                     32
           8.7    ElectdcaI Equipment
                  8.7.1     Stater                                                      36
                  8.7.2     Generator                                                   37

     9.   ADIUSTMENTS                                                                   38

           9.1    Governor Lever                                                        38

                  9.1. 1    Adjustmentprocedure                                         38


           9.2
                  9.1.2     Readjustment
                  Inbke/ExhaustValve

                  9.2.1
                                        procedure


                            Adjustmentprocedure
                                                                                        39
                                                                                        39
                                                                                        39
                                                                                        39
                                                                                              t
                  Fuel Injection Timing
          ._9.3
                  9.3..1..
                  "
                    :'.'
                           Checkinghints
                           ","'-"_b "'_"_

                  9.3.2     Adjustment procedure                                        40
          DISASSEMBLY                                                                   4I
           10,1 Preparation
           10.2 Serviceman'sKit                                                         4T

                  10.2. 1   General tools
                                                                                       '4r
                  10.2.2    Specialtools                                                42
                  10.2.3    Measuring instruments                                       42
                  10.2.4    Others                                                      43

           10.3 Precautions                                                             43
           10.4 Cl ul.chDisussemblj Prucedu-re                                          43
     1 1 , REASSEMBLY

           11. 1 Precautions                                                            4?

     12. STERN ARN,ANGEMENT                                                             48




I
I
[,

t           .                        "-llkl              =-4--
                           1. ENGINE IN PHOTOGRARHS

                                      Eye nur {for ho si ngenqine)




F

t
t
    (only for electi..l   startng)

                                                             Propeller
                                                                     shaft ;uprinq
                                 OF YSE SERIES
                          FEATURES
             2. OUTSTANDING
1.   Its extra-compactness, light weight, and large output permit engine room to be
     miniaturized.


2.   Wet tlpe single-disc clutch, and reduction/reversing gear offer very light forward/
     backward change, easy and positive operation, and outstanding durability.


3.   Selection of crankshaft-to-propeller   shaft ratios:   2 : 1 and 3 : 1.


4.   Selection ol starting systems: electric starting, coupled also available with handle
     starting, and handle stafiing with speed-up chain gearing (available to install on
     eitherbow or sternside).


5.   All-speed gove-rnor, insterlocked \tith easy-to-operate, durable Yanmar-Dickel type
     fuel injection pump. assures minimum load fluctuations and excellent low-speed oper-
     ation,


6.   Rotary type cooling water pump feat.rring ample circulating water and simple construc_
     tion makes the engine seizure-free.


7.   Flywheel enclosed in the cllrtch housing provides safety to the operator.


8.   Full sealed forced lubrication system saves oiling labor dudng operational mode,
     and thereby increases working efficiency.


9.   Constructional simplicity of component parts makes the engine very easy to operate,
     maintaitr, and inspect.



                                                                                              a




                                                2
'..-
   f:
                              3. GENERAL DESCRIPTION
          Each of Yanmar diesel engines, models YSE8 and YSE12, comes equipped with
    clutch reduction gear, which togethei with a flywheel is totally enclosed in the flywheel
    housing and the clutch housing. The propeller shaft is run from the flywheel side.
          The starter for electrical starting is directly mounted to the fly\rheel housing to
    drive the ring gear of the nyl,heel For chain starting, the power take-olf shaft is
    chain-connected to the starting shaft located immediately above the cjlinder. The engine
    is started b]'clockwise rotation on the stern side and by counter-clockwise rotation on the
    bo'i{ side.



    3,1     Construction

                       Part                             Description & Specifications

           1. CrI. bodr               llonoblock casting of water jacket, crankcase and
                                      oil pan.

           2. Cyl, liner              Wet tlpe made of special cast iron and coated with
                                      special anticorrosive paint.

           3. Main bearing            Side cover side: precision kelmet metal with thin
                                                       back metal.

                                      Fl]'wheel side: Thick meta-I.
                                                                                                  {
          4. Cyl.                     Gasket tfpe, part of monoblock including valve guides.

           5. Intake/exhaust valve    Mushroom ttpe.

           6. Intake pipe             lntakeneniatype madof stel.

           7. Exhaust silencer        Round, expansion t!pe, or water injection type'

           8. Valve drive system      Tappet & valve push rod type. Parabolic suction/
                                      exhaust cam with approach ramp.

           9. C rankshaft             Stamp forged, with induction hardened journal, pin
                                      and oil seal portions,

          10. Flywheel                Mounted to clutch, enclosed in flywheel housing-

          11. Piston                  Made of aluminum alloj/, oval shaped.

          12. Piston rings            Three compression rings, one oil scraper ring.

          13. Piston pin              Float type.


                                                    3

\
                 Part                           Description & Speciacations

     14, Connecting rod           I-section, stamp forged.

     15. Crankpin metal           Drum type

     16. Lube oil pump            Trochoid pump, driven by camshaft.

     17. Lube oil strainers       Iniet side: perforated steel t!?e.

                                  Outlet side: auto-clean tlpe, full-flow passing tlTe.

     18. Indicators               Electric starting: hydraulic lamp

                                  Manual startingr oil light

     1 9 . Lube oil circulation
         chart
                                   nlet side strainer

                                   rochoid pump

                                  Outlet side strainer




                                  Main bearing metal (flywheel side)

                                      Valve rocker arm chamber

                                  Main bearing metal(gearcase side

                                  Crankpin metal



     20. Cooling water pump       Rotary type (belt-driven from power take-off shaft)

     21. Fuel itrjectio! pump     Yanmar-Dickel type pump

     22. Fuel injection nozzle    Pintle nozzle
=t
         Fuel strainer            FiIter paper

     24. Fuel tank                Steel plate

     25. Governor                 Centritugal, all-speed tJpe



                                                                                          a
                       Part                               Description & Specifications

           26. Governor remote             Remote control wiTe, steel lever
               control device

           27. Decompressionremote Remote control wire, steel lever
               control

           28. Electric starting           Starter (!iog gear tlpe)
               devic
                                           Output: 1.0 KW at 12 v (nomirlal)
-1
 I                                         Battery: 40-?0AH
 i         29. Manual starting             Speed-up chain (on stern or bow side)
               de\rice
                                           Speed-up ratio:    2 . 0 7 ( Y S E 8 ) ,2 . 9 1 ( Y S E 1 2 )

           30. Rever8ing clutch           Wet t ?e siDgle plate disc clutch

           31. Reduction gear             Constant mesh spur gear type

                                          Reduction latio:     2 : \, 3 : 1

           32, Power take-off shaft       Spur gear-driven from crank gear with pulleys lor
               pulley                     alternator and for cooling water pump.




     3.2    PowerTakeoff ShaftPull.ys

     The outside pulley is for the alternator and the inside pulley for the cooling water. If the
     alteinator is not attached, the outside pulley can be used as desied to drive a bilge pump,

     (Remark) The flexible mounting being on engine, not using P.T.O. shaft.


                              Model                               YSE8                            YSE12

             PTO shaft rotation speed/engine speed           4100/3200rpm                           rpm
                                                                                            3380/30oo

             Outside diameter oI pulley                          90 mm                           1 1 0m m

             V belts                                         Single HM type                 Single HM tYP

             PTO max. permissible output power            r-t.s/32o0 HP/rpt!              2-3l3oooHPl4m

                                                                                                                 /

                                                    - 5
                                                                                                             ii
                                                                                                            :g
                                   4. PER]ODICAL M A I N T E N A N C E
                                                                                                 Hours of opemtion
                  No.                                                                                       !verY
                                                                                                   100        250    500

                  I     Fuel Oil         1.   C h e c kt l e l o i l l e v e l , a n d
                                              supply luel, if necessary.                     a
                                        2.    Discharge drainage {rom
                                                                                             a
                                        L
                                        4.
                                              Clern fuel str3iners.
                                              Renes the fuel st.liner
                                                                                                   o
                                              filter elements.                                                       a
                  2                      1.   Check lube oil levels in
                                              cftnkcase and reduction
                                              Sear case, ano supprJ
                                                                                             a
                                              lube oil, if necessary.
                                        2.    Lubricate the sarting shaft,
                                              chaih. and other Darts.                        a
                                        3.    Tun tbe lube oil shaine.
                                                                                             a
                                        L     O"e.h^l tn" Itb..il
                                                                                                   a
                                              R e n e Nc r a n k c a s el u b e o i l .
                                        6         Clnrch-aa-nb
                                              Renan                                      I                   a
                                        l.    D i s . h a r g e c o o i i n gq a r e r
    , -**r
                  3                           alte. ottrarion in cold                        a
                                        2.    Chec\ the recirculated
                                              condition of c@ling wate..                     a
             :;
                  4                     l.    Check fuel injeciion
                                              (iniection noise).
                                                                                             a
                                        2.    Adjust th govemor
                                        3,    Check fuel injection timing.                                           a
                                        t.    al@n the;;;,Ie.                                                        a
                  5     cylinder Eead   l.    RetightcD the cvlinder                               a
                                        2.    Adjust ih intake/exhausr
                                                                                                             a.
                                        3.    clean the intemal surfaces
                                              of combustion chamber.                                                 a
                                        l.    Clean the pre-cohbuslion
                                                                                                                     a
                                        5.    Checkth mtake/exhaust
                                                                                                                     a
                                        6.    Cbeck valve rocker alrn and
                                                                                                                     o
                  6                     1.    Wash the breather valve.                             a
                                        2.    Check the belt tensions
                                              (cooling saler pump,                                 a
                        Rrnc
                                        3.    Renew the anticorrosive
                                                                                                                     a
                                              Check the piston and the
                                        4.
                                              .ing.                                                                  a
                                                                            6

\
                             5. FUEL AND LUBRICATING OILS
         To the engine, fuel oil is food and lubricating oil is blood. Mis-handling might cause
     unexpected engine trouble. The efficiency of the Yanmar engine will dependupon strict
     adherence to these instructions and recommendati ons,
         It is the salesman's or serviceman's duty and mission to urge the user to follow them.


     5.1       FuelOils

     5.1.!     Propertyroquirsmsnts

      il\    IIidh.afanp     Tqfind



fl       loor ignitability of fuel oil results in a ignition lag, causing difficult starting or
\l   knockine.
I                "
      (2) Low sulphur content
         Sulphur contained iD fuel oil when burned is combined witi water to produce
     sulphuric acid v,/hichcorrodes metallic parts,
     (3) No dust or moisture content
         Dust and moisture contained in fuel oil can cause faster wear or sticking of the
     plunger of fuel injection pump and injection nozzle.
     (4) Appropdate viscosity
         Fuel viscosity has a relation to the condition of injection,              It should be such that the
     pluoger and the nozzle valve will be properly lubricated.                                                  .,n


     5.r.2     R*mmend        b.ands

                           Suppl
                               ie.                                        BraIto

                     SHELL                            Shell Diesoline (or local equivalent)

                     CALTEX                           Caltex Diesel Oil

                     MOBIL                            Mobil Diesel oil

                     ESSO                             Esso Diesel Oil

                     B. P. (British Petroleum)        B. P. Diesel OiI


              Lubricating
                        Oils

     5.2.1 Functions

     (1) Lubrication--reduces friction and wear ou sliding surfaces.
     (2) Cooling--carries             away combustion and {riction heat.
                                                             ,7
    (3) Air-tightening--keps the cylinder air-tight,                prevents escape of compressed
        air and operating gas.
    (4) Cleaning--carries away carbon (combustion product) and intelnal dust.
    (5) Rust prevention--keeps parts from rust.
        Today, improved engines call for Ngh-quality lubdcating oils. Oil companies
    are now using a [umber of additives to improve the properties of their lubricaung oils.


    5.2.2                 by viscositv
             Classification

    Lube oil viscosity should be so selected as to suit the ambient temperature.


                                                    SAE-Viscosity Table


                              ..             o'F ( 17.8"C)                           I l0oFta8 aoc)
                    SAE

t                   No.        Sayboli unive'sal         Kinematic
                                                        viscosity.CSt
                                                                         $ybotl uoiYersar
                                                                                                viscosiry.
                                                                                                        CSI


I                    5W             below 4,000         below 869




F     lo'c
                    10w

                    20w

                     20
                                   6,000a-l
                                         2,000

                                   r 2,000b48,000
                                                        1,303a-2,606

                                                       2,606b-10323

                                                                             45-58               513.9.62
      l0
      -2ec
                     30                                                       58-70             9.62.t2.93

                     40                                                       7G85              t2.92-16.7'1
      300c                                                                   85-110             16.17.22.68
                     50




                                                              8
     5.2.3   Rocommended   (t9r crankce andger
                      brands                 box,

                                                                  SAE No.
      Supplier
                                                below 10'C 10 - 20'c 20 - 35'C over 35"C
                                                    10w       20/20w
                                                                            30
                   Shll Rotella oil
                                                    20/2ow                  40
                                                                            30
     SHELL         Shell Talona Oil                 10w         2Q               50
                                                                            40
                                                                            30
                   Shell Rimula oil                 20/20\v   20/20w        40
                                                                                 50

                                                                            30
                   RPM Delo Marine Oil              10w         20
                                                                            40
     CALTEX
                                                    10w                     30
                   RPM DeIo Multi-Service Oil                   20
                                                    20/20W                  40
                                                                            30
                   Delvac Special                   10w         20
                                                                            40

                   Delvac 20W-40                    20w-40    20w-40
     MOBIL
                                                    20-20w                  30
                   Delvac 1100Series                       20-20w
                                                    10w                     40
                                                    20-20w                  30
                   DeIvac 1200Series                       20-20w                50
                                                    10w                     40
                                                                            30
                   Estor HD                         r0w         20
                                                                            40
                                                                            30
     ESSO          Esso Lube HD                                 20               50
                                                                            40
                                                                            30
                   Standard Diesel Oil              10w         20
                                                                            40

     B.P.        B P. Energol
     (British    B P. Venellus*                                             30
                                                    20w,30 20w,30                50
     Petroleuno) B P. Diesel 53                                             40
                 B P. venellus**


       * API gr.adeCB
      ** API gxade CD




                                                    9

\*
                              6. TROUBLESHOOTING
     The best engine will come to malfunction i{ not properly handled day after day or
after a prolonged period of service.
     Locating the trouble is the first consideration. Pinpointing the trouble cause is to
be done next. Then comes a proper remedy therefore. If careless handling is the case,
the operator may be instructed not to cause the same trouble.
     The following lists the troubles, check points, possible causes, and remedies.


6.1    EngineDoesNot Start

        Check point                Possible cause
1. Intake/xhaust         1. No valve clearance.             Adjust to 0, 2 mm.
                         2. Calbod or wear on valve          Fit valve with quick
                            seat.                            successlvemovemenls.
                         3. Worn valve guide.               Renewcylinder head.      " 24

                         4.   lntake/exhaustvalve
                              stuck.

2. Fuel injection             Loose or uns] mmetricalll
   nozzle                     tightened nozzle guard.
                         2. FaultJ or lost packing.         Repair or renew.
     Cylinder liner      1. UnsuitableIube oil.             Change oil.
 .* r& piston
                         2. Gasoline overcharged at
                            start-up.
                         3. Stuckor worn piston ring,
                         4. Seized or worn piston and                                  27
                            cylinder Iiner.                                            30

4, Gasket                1. Gasket damaged (loose or        Renew or retighten
                            unsymmetrically ti ghtened
                            head).
                         1. Fuel failure.                   Supply fuel.
                         2. Tank cock in closed position.
6. Fuel injection        1. Air in pump.
   pump
                         2.   Difiy, scratched or worn      Clean or renew.
                              delivery valve.

                         3. Dirty, scratchedor worn         Clean or renew.
                            regulator needle.
                                                            Clean or renew.
     Check poi[t                        Possible cause                      Remecty

?. Fuel injection          1. Stuckor worn nozzle.             Clean or renev.               I9
   nozzle
                           2, Hight or low injection pres-     Adjust to 160 kglcm2.         20
                              sure.
8. Main bearing            1. Stuck or seized.                 C l e a no r r e n e r r .
9. Crankpin metal          1. Stuck or seized.                 Clean or rene*.               26

10. Starter operatio.r     1. Battery discharge.               Rechargeup to 1,26 (S.C. )
                                                               at 20'C.
                           2, Kev switch fault.                Renew.
                           3, Magnetswitch fault.              Correct or renew.
                           .1, llotor brush fault.             Renew.

                           5. llotor unit fault.               Renew,
11. Batterv                I.   Batter!   discharge,           Rechargeup to 1. 26 (S.G. )
                                                               at 20'C.
                           2. Voltage drop (under no load)     Renewii below 12V.
12. Govelllor   lever      1. Not properly adjusted.           Readjust.                     38         F.   .l
                                                                                                   =.         t
                                                                                                              I

      Dilficult Start.up

     Check point                        Possible cause                      Remedy

l.   Temperature           1.   Lo\a.                          Select suitable lube oiL
                                                               Use start-up accelerator.
2. Fuel oil                l.   Unsuitable qualit!.            Change fuel oil                7

3. Injection               1, Stuck or worn nozzle valve.      Clean or renew.               19              4
                           2. Low injection pressure.          Ad.iust to 160 kg,/cmz.       20

                           3. Worn plunger.                    Renew.
4.   Intak/exhaust         1. Misadjusted.                     Reactjust.
                                                                                             39

5, Compression
6. Electric
   equrpment
                                                                                             26
7. Heavy manual            1. Stuck or seized piston, liner.   Correct or renew.             3t)
   turnrng
                           2, Stuck or seized main beadng      Correct oI renew,             33
                              metal.
                           3. Stuck or seized crankpin         Correct or renew.             26
                              metal.
                           4.   Unsuitable lube oil.           Change oil                     8

                                                  lt                                                          :
       6.3     Bad Exhaust
                         Color


                 Check point               Possible cause                         Remedy

        1. Operating             1. Overloaded operation.             Reduceload.
           conditions
        2. Output decrease                                                                           13
        3. Fuel oil              1. Unsuitable quality.               Change fuel oil.                7

       4. Injection              1. Stuck ot rlorn nozzle,            Correct or renew.              19

                                 2. Low injection preaaure.           Adjust to 160 kg/cm2           20

        5. Injection timing      1. lnjection lag.                    Set to 10 + 2" before TD.c.,
                                                                                                     40
                                                                      listeoing to injection noise
        6. Carbon deposit        1. Stuck or worn piston ring or      Correct or renew.
                                                                                                     21
           (Sticky)                 oil ring.
                                 2. WoIII cylinder liner or piston.   Renew.                         27
                                    (Burning oil)                                                    30
Ir
F
r      6.4     MomentaryHith{peed Revolution
I
                 Check point               Possible cause                        Re6edy

        1. Regulator handle      l.   Sudden operatioD,               Do not move it suddnly.
F                                                                                                    38
       ?,. Governor syatem       1. Misadjusted lever,                Readjust.
{a:"                             2. Stuck regulator spindle.          Cleao and correct,


       6.5     Hunting

I                Check point               Possible cause                        Remedy
        1. Govemor               1. Misadj usted levr.                Readjust.                      38
           system
                                 2. Stuck regulator spiodle.          Clean and correct.
                                 3, Malfuction of No. I lever         Correct.
                                    shait.
       2. Injection              1. Stuck or worn nozzle,             Correct or renew.
                                 2. High or low preasure.             Adjust to 160 kg,/cm2          20
       3-    r uel oll           L. Inferior quality.                 Change fuel oil.
       4. Idjectiod timing       1. Injection advance or lag.         Set to 10 + 2' before TDC.,
                                                                                                    40
                                                                      listening to injection noise.
       5. C rankshaft side       1. Large gap. (worn main             Renew'
                                                                                                     33
          gap                       bearing)
      6.6     Output Decrease

               Check point                    Possible cause                              Remedy

       1. Compression
      2.    Intake/exhaust      1. over/under clearance.                    Adjust to 0.2 mm.            39
            valve

      3. Injectiod              1, Stuck or worn nozzle.                    Colrect or renew,            19

                                2. Pressure drop,                           Adjust to 160 kglcm2.        20
                                3. \forn plunger,                           Renew.                       18

I                               4. Scratchedor worn delivery                Correct or renew.
                                   !alve.
                                5. Uisadjusted govemor lever.               Readjust.                    38

      4, Fuel oil               l    L n s u i t a b l eq u 3 l i t , ! .   Change fuel oil.              7
      5. CombustioD             1. Carbon deposit                           Remove.
         chamber

      6. Moving parts           l.   Stuck or seized cylinder liner         Correct orarenert.           27
                                     and piston.                                                         30

                                2. Stuck or seized crankpin                 Correct or renew.            26
                                   metal.
                                3. Stuckor seized main bearing              Correct or renew.
                                                                                                         32
                                   metal.
                                4. Stuckor seized piston pin                Correct or renew.
                                                                                                         27
                                   and pin metal.


      6-7     KnockingduringOporation

               Check point                   Possible cause                               Remedy

       1. Tightening            1. Loose end nut.                           Retighten.
          parts
                                2. Irose connecting rod bolts               Retighten.
                                   and nuts.
                                3. Other tightening parts loose,            Retighten,
      2. Moving parts           1. Worn or seized crankpin                  Renew,                       26
                                   metal.
                                2. worn or seized mai! bearing              Renew.
                                                                                                         32
                                   metal.
                                3. worn or seized piston pin and Renew.                                  27
                                   pin metal.

      3. Intake/exhaust         1, Large cleaiance.                         A d j u s tt o 0 . 2 m m .   39
         valve

                                                                  l3

a._
              Cbeck point               Posaible cause                    Remedy

       4. Fuel oil.             1. Unsuitable quality.           Change fuel oil.        7

       5. Injection.            1. Stuckor worn nozzle.          Correct or renew,       19
                                2. High or low pressure.         Adjust to 160 kglcm2.   20


      6.8    SuddenEngineStop

              Check point               Possible cause                    Remedy

       1. Heavy manual          1. Seizedmain bearing metal.     Renew.
          rurrung.                                                                       26
                                2. Seized crankpin metal.        Renew,
                                3. Seized pistod and cylinder    Renew.                  27
                                   Iiner,                                                30

       2. Injection

       3. Compression.
                                1. Fuel failure,                 Supply fuel oil

F                               2. Unsuitable.luality.           Changefuel oil
       5. Load.                 1. Overload.                     Reduce load.

14"
t     6,9    Luboil Leak

              Check point               Possible cause                    Remedy
       1, Contact surfaces      1. Loose bolts and nuts.         Retighten.
          of parts.
                                2. Scratched packings.           Renew.
       2. Sliding parts.        1. Scratched or worn oil seals   Renew.
                                   or shafts.
       3. Lube oil tube.        1, Loose bolts or scratched.     Retighten or renew.


      6.10   FuelOil Leak

             Check point                Possible cause                    Remedy

       1. Firel tank cock       1. Loose bolts and nuts, ot      Retighten, or rene\r.
          reutlner.                scratched packings.
       2. Fuel oil pipe.        1. Loose or scratchedbolts.      Retighten, or renew,
       3. Oil reaervoir.        1. Defective plunger tightning   Retighten, or renew.
                                   nuts, loose setbolts, damaged                         23
                                   packings, or scratched
                                   codtact surfaces,




                                                   l4
     6.11   WaterLeak

             Check point               Possible cause                   Remedy
      1. Rocker cover         1. Loose bolts and nuts.        Retighten.
                              2. Damagedpackings.             Rene\r.
      2. Cylinder head,       1, Crack causedby fteezing.     Renew.
                              2. Loose bolts.                 Retighten.                    24

                              3. Damagedgaskets.              Renew.
      3, Cylinder body.       1. Crack causedby freezing.     Renew.
 a
      4, Inside of crank-     1. Scractched liner packing.    Renew.
         case.


     6.12   CoolingWaer Failure

             Check point              Posaible cause                    Remedy
      1. Kidgston cock.       1. Dirty mouth.                 Clean.
                             2. Cock in closed position,      Open cock.
      2, Cooling water        1, Scratchedpackings,           Renew.                        22
         pipe flange.
                             2. Loose tighteningparts.        Retighten.
      3. Pump drive           1. Slack belt,                  Tighten. Adjust finger-
         belt.                                                depressed deflexion to
                                                              5-? mm.




     4. Cooling water        1. Scratched or worn imDeller,   Renew.
        pump.                                                                               22


 a   6.13   ClutchSliD

            Check point               Poasible cause                    Remedy
     1. Friction disc.       1. Worrl disc.                   Renew if total wear on bott
                                                              sides er(ceeds2 mm.
     2. Spring.              1, Weakened ot broken.           Renew.




                                                15
\-
             7. WEAR LIMIT OF EACH MAIN PART

                                                     YSES                                  YSEl2
                Description                                                                   wear limit,
                                           std. dim. ,   wear limit,       std. dim, ,
                                                           mm                                    mm

          Clearance between cylinder                        0.38             0.208                 0.43
                                             0:109
          liner and piston
          Clearance between piston pin       0.0375         0.30             0.0375                0.30
          and piston pin metal
          Clearance between crankpin         0.036          0.14             0.036                 0.17
          and cranl

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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.