312
GEARCASE SERVICE, 40 – 65 HP MODELS
DRIVESHAFT SHIMMING
DRIVESHAFT SHIMMING
If a new pinion gear is needed,
replace gear set before shimming.
Pinion ge ar backla sh is adju sted by using shims
between the drivesh aft bearing hou sing and the
thrust washer. When in stalling a new thrust bear-
ing o r washer , bearing housing, pinion, or drive-
shaft, it is n ecessary to p roperly sh im the
assembly to restore the correct clearance.
Use Driveshaft Shimming Tool, P/N 5005925.
Shim gauge bars are precision made and should
be handled carefully. The len gth of each bar is
stamped near the part number. This dimension is
0.020 in. (0.508 mm) shorter than the actu al
shimmed length of the driveshaft.
IMPORTANT: Clean pinion and driveshaf t
before assembly. Replace any damaged parts.
Assemble t he driveshaf t bearing ho using, thru st
washer, thrust bearing, and pinion onto the drive-
shaft. Use Driveshaft Seal Protector, P/N 312403,
when installing or removing the bearing housing.
Lightly coat the threads of the pinion nut with out-
board lubricant and tighten to a torque of 40 to 45
ft. lbs. (54 to 60 N·m).
IMPORTANT: The origina l pinion nut may be
used for shimming, but must NOT be used in final
assembly.
Select correct collar and shim gauge bar:
• Collar: P/N 328363
• Shim gauge bar: P/N 328366
Slide the collar o nto the driveshaft with large e nd
in contact with the bearing housing.
Insert the assembled driveshaft into the tool base
and tighten pre load screw against the driveshaft
until groove on the spr ing-loaded plunger is flush
with end of threads. Tighten locking ring on pre-
load screw.
Rotate the driveshaf t several revolutions to se at
bearings.
Lay the tool b ase on it s side . Place the shim
gauge bar against guide pins of the tool base.
Check squareness of the bearing housing mount-
ing surface by holding the shim gauge bar against
the pinion while rot ating just the bearing hous-
ing. Use a fe eler g auge to me asure cle arance
1. Driveshaft bearing housing
2. Thrust washer
3. Thrust bearing
4. Pinion
COA3565
1. Collar
2. Tool base
3. Groove
COA3566
DSC00326
1. Shim gauge bar 005416
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