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OMC Cobra shimming techniques newsletter

Repair of upper gearcase yoke-water pump shaft assembly

  • Water pump shaft bearing removal is best removed by grinding one side of cone bearing until a line break can be seen on the race.
  • Note the water pump shaft must be protected with a cover of some type in case grinder slips.
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By author Trish Dougherty

Aftermarket OMC Cobra shimming parts with plastic shim sizes .007, .009 and .011. comes in a kit. T.C. Marine uses a standard shimming size of .020 between the front yoke bearing carrier # 27920 and the case, see picture illustration.

22 962 Gearcase kit ratio 21-16
22 962 Gearcase kit ratio 21-16

Stainless steel shims sizes of .005 # 23372, .007 # 23373 and .010 # 23374 on drawing are then placed in back of rear bearing cup until 5 to 8 torque lbs specification is made. In the marine trade this is called bearing pre-load.

tool 124
tool 124

Gasket sealant and retaining compounds are required, Loctite aviation gasket sealant ( liquid type ) # 30517 is used with all o rings

Loctite 680 P/N 68015 retaining compound for small yoke shaft bearing cup and outside seals.

tool 1
tool 1

Yoke water pump shaft # 28320 must be shimmed first with out the pinion gear installed, so torque value can be adjusted with out lower pinion gear drag.

 Note failure to replace # 22525 centering cone may result in driven gear bearing out of round on yoke drive shaft. U-joint nut # 28470 can be reused if blue loctite is used with the nut.

 Oil seal # 86530 and oil seal # 86610 should be used with loctite 680 after bearing carrier seal area is sanded clean or wire brushed.

tools 2
tools 2

This page will forward to our tech service web site around Jan 30th 2015, until this time please contact tech service department for questions concerning your repairs.

 

OMC Cobra and king cobra stern drive repair manual by Seloc will give step by step procedures to help boating enthusiasts performing their own work. They are sold by Wal-Mart on-line or Wal-Mart stores.

 

Repair parts that may be needed for OMC Cobra upper gear case are listed below

# 15 #22525 Centering cone $28.79
# 16 #28470 U-joint nut $15.79
# 5 #28460 Pinion nut $23.79
# 34 #27800 Pinion / bearing carrier $77.79
# 3-4-14-17-2227 Bearing set $129.79
# 7-12-13-18-19-20-21-22-26-28-29-37-53
Above parts in # 87654 Seal kit $31.79
# 45 #23366 Plastic shim kit $14.79
# 52 #23372 .007 Shim stainless steel $8.79
# 52 #23373 .010 Shim stainless steel $4.79
# 52 #23374 .012 Shim stainless steel $4.79
# 52 #23372 .015 Shim stainless steel $4.79
# 30517 Aviation gasket $12.79
60921 Loctite $19.79
#11 #28320 Yoke-water pump shaft $226.79
Total Repair parts cost $605.56