LOWER UNIT 10-23
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
Follow the procedure below to adjust forward gear / pinion gear.
Step to prior to adjustment
1. Correctly assemble driveshaft bearing housing, driveshaft,
forward gear, pinion gear and related components (see page
10-14 to 10-16).
NOTE:
When installing forward gear back-up shim, choose shim thin-
ner than design specification for calculating adjustment.
2. Tighten pinion nut to specified torque.
! Pinion nut : 18 N
.
m (1.8 kg-m, 13.0 lb.-ft.)
3. Temporarily fasten the driveshaft bearing housing to the
gearcase with two bolts and nuts.
Place the bolts diagonally to the lower unit mounting hole.
Numerical
index / item
Available
thickness
(mm)
Design
specification
Thickness
(mm)
Pinion gear
back up shim
1.7, 1.8, 1.9, 2.0, 2.1, 2.2
2.0
Forward gear
back up shim
0.8, 0.9, 1.0, 1.1, 1.2, 1.3,
1.4, 1,5
1.2
Forward gear
thrust washer
2.0
2.0
Reverse gear
thrust washer
1.6, 1.8, 2.0, 2.2, 2.4, 2.6
2.0
Reverse gear
back up shim
0.2, 0.5, 0.8, 1.0
1.5
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