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LOWER UNIT 8-21
LOWER UNIT GEARS- SHIMMING AND
ADJUSTMENT
If lower unit has been rebuilt or has had components replaced,
shimming for correct gear contact and backlash will have to be
adjusted to ensure smooth, reliable operation of gears.
Shim/Washer & Mounting position
FORWARD GEAR/PINION GEAR
Step to prior to adjustment
Correctly assemble forward gear, pinion gear, driveshaft and
related components. (See page 8-15.)
NOTE:
When installing the forward gear back-up shim, choose shim
thinner than design specification for calculating adjustment.
Adjusting gear backlash
Check a slight amount of backlash exists between the pinion
gear and forward gear by slightly rotating driveshaft or forward
gear by hand.
• If backlash is larger than the specified, thickness of the for-
ward gear back-up shim must be increased.
• If backlash is smaller, the forward gear back-up shim thick-
ness must be decreased.
Numerical
index/item
Available
thickness
(mm)
Design
specification
thickness
(mm)
1
Pinion gear back up
shim
0.7, 0.8, 0.9, 1.0,
1.1, 1.2, 1.3
1.0
2
Forward gear back
up shim
0.7, 0.8, 0.9, 1.0,
1.1, 1.2, 1.3
1.0
3
Forward gear thrust
washer
1.5
1.5
4
Reverse gear thrust
washer
1.1, 1.2, 1.3, 1.4,
1.5, 1.6, 1.7, 1.8,
1.9
1.5
5
Reverse gear back
up shim
0.7, 0.8, 0.9, 1.0,
1.1, 1.2, 1.3
1.0