Sunday, July22, 2018

' Sherwood Pump Repair 3047'

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The Original Engine Cooling Pump Since Series Technical Guide 9959 Impeller
G302 G302B G9901 G9903
K75 K75B J70 G15
Assembly Disassembly Instructions
23 6
8 7 10
18 20
16 13 11
19 14 15 9 5
The following procedures apply to all G Series pumps Deviations from pump to pump are primarily a result
of different methods of drive and 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 oring 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 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 138
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 pulleyhub 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
Assembly Disassembly Instructions 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 oring 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 G302B G302 G9901 G9903 J70 K75B
Engine Manufacturer Chris Craft Chris Craft Chris Craft VolvoOMC VolvoOMC Commander
Engine Model 350 350 350 68 Cyl 4 Cyl 302351
ITEM QTY 168018346 168018346 3852398 3855079 CM110610
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 Oring 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 23 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
1314 Water SealSeat 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
1 reason for premature engine wear is overheating To maintain engine performance
insist upon genuine Sherwood impellers and service inspection to be performed at any service 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 Replace at major pump rebuild or
if pittingwear is evident Tear
Bead Worn
Cover Replace at major pump rebuild or if wear exists to maintain pump To A Flat
flow and suction Seal Replace at minor and major pump rebuild or if leaking Ripped
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 Inspect for loss of grease corrosion or rough rotation
Replace at major pump rebuild or if in doubt
See maintenance schedule on back page
Preventative Pleasure Boating 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
109959 Impeller 109959 Impeller 109959 Impeller
112231 ORing 112231 ORing 112231 ORing
112855 Gasket 112855 Gasket 112855 Gasket
112859 Seal 112859 Seal
104258 Snap Ring 304258 Snap Ring
104432 Key 104432 Key
104264 Washer 104264 Washer
204259 Snap Rings 204259 Snap Rings
223448 Bearings
112856 End Plate
115883 Cam
110515 Cam Screw
G15 X X X
G21 X X X
G302B X X X
G302 X X X
G9901 X X X
G9903 X X X
G552 X X X
J70 X X X
K75B X X 3047

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