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' Sherwood Pump Repair 3047'



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The Original Engine Cooling Pump Since 1921
www.sherwoodpumps.com




G Series Technical Guide  9959 Impeller


                                   Identification




                  G30-2 & G30-2B                    G9901 & G9903




      K75 & K75B                        J70                         G15
                          Assembly / Disassembly Instructions
                                                                                                                           4
                                                                                                            21
                                                                                           22

      23                                                                                                         6
                                                               8          7          10
                18                        20
                               1
                                                          12




                 16                                       13                          11
                                          19         14                                      15 9      5
                           3
The following assembly/disassembly procedures apply to all G Series pumps. Deviations from pump to pump are primarily a result
of different methods of drive and mounting.

Disassembly:
A. Remove the screws (1) and lockwashers (2) that hold the body (3) and housing (4) together.
B. The housing assembly including the impeller (5) can be removed from the body assembly, along with the o-ring (6), spacer
   plate (7) and gasket (8).
C. Remove the woodruff key (9) from the shaft (10). If the shaft is to be used again, and if it is put in a vise, always use lead over
   the jaws of the vise so that the shaft is not damaged.
D. Remove the retaining ring (11 or 15) from the shaft (impeller end). The shoulder washer (12) and seat assembly (13) can now
   be removed.
E. From the drive end of the pump (pulley end, hub end, shaft end), remove retaining ring, remove pin (17), remove woodruff key
   (18) and loosen setscrew if used. NOTE: If the pulley (23) or hub (24) is pressed on the shaft, it will be necessary to locate a
   support directly between the pump body and pulley or hub as close to the shaft as possible. Press the shaft out of the pulley or
   hub. Make sure the body is free and not supported.
F. Remove the large internal retaining ring (16) from the body at the end of the bearing.
G. Support the body, and press the shaft, bearings (19), spacer (20) and retaining rings (11) out through the bearing or pulley end
   of the body.
H. The seal assembly (14) is pressed into the body. It can be removed by pushing a tool through the bearing end and up against
   the metal or back side of the seal. NOTE: On some pumps there is a spacer located between the pulley (hub) and bearing on
   the shaft. On other pumps, the bearings are positioned on the shaft with a retaining ring on each end. Support the bearings on
   the inner race, and push the shaft out of the bearings.

Assembly:
A. When assembling the cam (21), put Permatex #1 on the backside of the cam and the screw (22) that retains the cam. Wipe off
   any Permatex that gets into the impeller cavity.
B. Assemble a retaining ring (11) on the shaft into the second groove from the impeller end. Push the ball bearing (19) over the
   shaft (10). Press on the inner race of the bearing. Push the bearing up against the retaining ring. Assemble a spacer and then
   the second ball bearing. Assemble the second retaining ring over the shaft and up against the ball bearing, if required.
C. There is a large internal retaining ring (16) located in the body that provides a shoulder for the bearings (approximately 1.38"
   from the bearing end of the body). If it has been removed, it must be inserted at this time.
D. Press the mechanical seal (14) into the body from the impeller end. Make sure that seal is pressed in square. A tool should be
   used to assure proper assembly.
E. Push the bearing and shaft assembly into the body using care not to cock the bearing. A tool is recommended that will give
   you uniform pressure on the bearing outer race. Lock the bearing in place with the large internal retaining ring.
F. Assemble the seat assembly (13), shoulder washer (12) and retaining ring (11 or 15) over the shaft from the impeller end.
   Locate the white ceramic surface against the seal  Do not damage (scratch) the white ceramic surface of the seat, or the seal
   and seat assembly might leak. Lubricate the rubber part of the seat and use a tool for ease of assembly.
G. While supporting the shaft, press the pulley (23) or hub (24) onto the shaft. Secure pulley/hub with pin (17) or key (18) and
   retaining ring or setscrew as needed.
H. Press the woodruff key (9) into the shaft. Make sure the stainless steel key is used at this location.
I. Assemble the impeller (5) into the housing (4).
                                                                   1
             Assembly / Disassembly Instructions (continued)

J. Assemble the gasket (8) and spacer plate (7) on the body (3), and line up the screw holes. Replace the lockwashers (2) and
   tighten the screws (1).
K. Make sure the o-ring (6) is properly located in the groove in the housing. A small dab of grease will help hold it in position
   until the housing to body screws are tightened.

        Sherwood #                    G15            G21        G30-2B       G30-2           G9901          G9903       J70              K75B
        Engine Manufacturer        Chris Craft                 Chris Craft Chris Craft     Volvo/OMC      Volvo/OMC Commander
        Engine Model                  350                          350         350          6&8 Cyl          4 Cyl   302&351
ITEM                         QTY                              16.80-18346 16.80-18346       3852398        3855079 CM1-10-610
  1     Screw                 3       12857         12857        12857       12857           12857          12857     12857              12857
  2     Lockwasher            3       12710         12710        12710       12710           21757          21757     12710              12710
  3     Body                  1       12324         12328        19784       12328           21153          21759     12328              19948
  4     Housing               1       12303         12303        12303       12303           21151          21151     12303              13793
  5     Impeller              1        9959          9959         9959        9959            9959           9959      9959               9959
  6     O-ring                1       12231         12231        12231       12231           12231          12231     12231              12231
  7     End Plate             1       12856         12856        12856       12856           12856          12856     12856              12856
  8     Gasket                1       12855         12855        12855       12855           12855          12855     12855              12855
  9     Key                   1        4432          4432         4432        4432            4432           4432      4432               4432
  10    Shaft                 1       12233         13363        12612       12612           13363          13363     13274              13363
  11    Retaining Ring (Ext) 2/3       4258          4258         4258        4258            4258           4258      4258               4258
  12    Washer                1        4264          4264         4264        4264            4264           4264      4264               4264
  15    Retaining Ring (Ext) 1        12305
  16    Retaining Ring (Int)  2        4259         4259          4259          4259           4259         4259         4259            4259
  17    Pin                   1                                  12791         12791
  18    Key                   1       12622                                                                             12622
  19    Ball Bearing          2       23448         23448        23448         23448         23448         23448        23448            23448
  20    Spacer                1        5133          5133         5133          5133          5133          5133         5133             5133
  21    Cam                   1       15883         15883        15883         15883         15883         15883        15883            15883
  22    Cam Screw             1       10515         10515        10515         10515         10515         10515        10515            10515
  23    Drive Pulley or Gear 1        12323         19729                                    21154         21175        13429
  24    Hub                   1                                  12615         12615                                                     13795
13/14   Water Seal/Seat Assy 1        12859         12859        12859         12859         12859         12859        12859            12859
        Minor Repair Kit              23979         23979        23979         23979         23979         23979        23979            23979
        Major Repair Kit              12665         12665        12665         12665         12665         12665        12665            12665




                                                            Inspection

The #1 reason for premature engine wear is overheating. To maintain engine performance,
                insist upon genuine Sherwood impellers and service kits.
Recommended inspection to be performed at any service interval:
Impeller . . . . . . . . . . . Inspect for cracks or tears. Also, inspect for excessive abrasion of vane ends. Replace annually,
                            or if any of the conditions exist, as in the picture below.*
Wear Plate . . . . . . . . . Inspect for wear, flatness, and pin for fatigue. Replace at minor and major pump
                            rebuild or if wear is evident to maintain pump flow and suction performance. Pitting                   Cavitation
Cam . . . . . . . . . . . . . . Replace at major pump rebuild or if pitting/wear is evident.                                             Tear
                                                                                                          Bead Worn
Cover . . . . . . . . . . . . . Replace at major pump rebuild or if wear exists to maintain pump          To A Flat
                            flow and suction performance.
Mechanical Seal . . . . Replace at minor and major pump rebuild or if leaking.                            Ripped
                                                                                                          Vane
Lip Seal . . . . . . . . . . . Replace at minor and major pump rebuild or if leaking.                                               Bowed (set)
Shaft . . . . . . . . . . . . . . Inspect for wear in area of lip seal and rubber impeller. Grooving of
                            lip seal area or heavy fretting of the impeller end shaft will require shaft replacement.
Bearing . . . . . . . . . . . . Inspect for loss of grease, corrosion or rough rotation. Replace at major pump rebuild or if in doubt.

* See maintenance schedule on back page


                                                                       2
                                 Preventative Maintenance


                                     Pleasure Boating                             Commercial/Fishing Use
     Maintenance                            (Low Hours)                                     (High Hours)
      Schedule                Light Duty              Severe Duty              Heavy Duty               Severe Duty
                                                    (High RPM, Silt or Sand)                        (High RPM, Silt or Sand)

       Impeller Kit            Every year                 6 months              6 months                   3 months
        Minor Kit               2 years                   Every year           Every year                  6 months
        Major Kit               4 years                    2 years               2 years                 Every year




                                    Impeller Kit               Minor Kit            Major Kit
                                      09959K                    23979                12665
                                 1-09959 Impeller         1-09959 Impeller     1-09959 Impeller
                                 1-12231 O-Ring           1-12231 O-Ring       1-12231 O-Ring
                                 1-12855 Gasket           1-12855 Gasket       1-12855 Gasket
                                                          1-12859 Seal         1-12859 Seal
                                                          1-04258 Snap Ring    3-04258 Snap Ring
                                                          1-04432 Key          1-04432 Key
                                                          1-04264 Washer       1-04264 Washer
                                                          2-04259 Snap Rings   2-04259 Snap Rings
                                                                               2-23448 Bearings
                                                                               1-12856 End Plate
                                                                               1-15883 Cam
                                                                               1-10515 Cam Screw


                      G15                   X                        X                  X
                      G21                   X                        X                  X
                      G30-2B                X                        X                  X
                      G30-2                 X                        X                  X
                      G9901                 X                        X                  X
                      G9903                 X                        X                  X
                      G55-2                 X                        X                  X
                      J70                   X                        X                  X
                      K75B                  X                        X                  X




5/02
Form 3047


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