6-25
E
LOWR
SHIM SELECTION
Example:
If M is “28.60 mm” R is “–1”, then
T2 = 28.60 – 28.00 + 1/100 = 0.61
NOTE:
● Use a minimum number of shims to
obtain the thickness equal or nearly equal
to the calculation.
● Install the shims with the thicker one on
the outer side.
163015-0*
MEASURING THE BACKLASH
NOTE:
● Do not install the water pump compo-
nents when measuring the backlash.
● Both forward and reverse gear backlashes
should be measured.
● If both the forward and reverse gear back-
lashes are larger than specified, the pinion
may be too high.
● If both forward and reverse gear back-
lashes are smaller than specified, the pin-
ion may be too low.
● If either of these conditions exists, then
check the pinion shim selection.
1. Place the shift rod in neutral.
2. Install a dial gauge on the gear case.
3. Install a backlash indicator gauge (spe-
cial service tool) on the drive shaft (50,
60, 70 hp: 18 mm in diameter, 75, 80, 90
hp: 20 mm in diameter) and make the
dial gauge stem contact the mark on the
indicator gauge.
Available shim thickness:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40
and 0.50 mm
Dial gauge:
YU-3097/90890-01252........... 1
Magnet base:
YU-34481/90890-06705......... 2
Backlash indicator:
YB-6265/90890-06706 ........... 3
Backlash adjusting plate:
YB-7003.................................. 4
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