308
GEARCASE SERVICE, 40 – 60 HP MODELS
DRIVESHAFT SHIMMING
DRIVESHAFT SHIMMING
If a new pinion gear is needed,
replace gear set before shimming.
Pinion gear backlash is adjusted by using shims
between the driveshaft bearing housing and the
thrust washer. When installing a new thrust bear-
ing or washer, bearing housing, pinion, or drive-
shaft, it is necessary to properly shim 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 length of each bar is
stamped near the part number. This dimension is
0.020 in. (0.508 mm) shorter than the actual
shimmed length of the driveshaft.
IMPORTANT: Clean pinion and driveshaft
before assembly. Replace any damaged parts.
Assemble the driveshaft bearing housing, thrust
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 original 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 onto the driveshaft with large end
in contact with the bearing housing.
Insert the assembled driveshaft into the tool base
and tighten preload screw against the driveshaft
until groove on the spring-loaded plunger is flush
with end of threads. Tighten locking ring on pre-
load screw.
Rotate the driveshaft several revolutions to seat
bearings.
Lay the tool base on its 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 rotating just the bearing hous-
ing. Use a feeler gauge to measure clearance
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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