Yamaha 50G Service Manual page 114

LOWR
SHIM SELECTION (FOR USA AND CANADA)
Example: (60, 70 hp)
If R mark is "+5", then
M = 1.00 – (+5)/100 mm
= 1.00 – 0.05 mm
= 0.95 mm
If R mark is "–3", then
M = 1.00 – (–3)/100 mm
= 1.00 + 0.03 mm
= 1.03 mm
Example: (75, 90 hp)
If R mark is "+5", then
M =1.50 – (+5)/100 mm
=1.50 – 0.05 mm
=0.45 mm
If R mark is "–3", then
M =1.50 – (–3)/100 mm
=1.50 + 0.03 mm
=1.53 mm
2. Place the original shim(s) on the thrust
washer mounted on the bearing hous-
ing and place the shimming gauge on
top of the shim(s) as shown in the illus-
tration.
NOTE:
1. If the original shim(s) is unavailable, start
with a 0.50 mm shim.
2. Be sure to remove the O-ring from under
the thrust washer.
Shimming gauge:
YB-34468-5 (60, 70 hp)
YB-34468-3 (75, 90 hp)
3. Using a thickness gauge at the specified
measurement (M) established above,
check the fit between the shimming
gauge and the reverse gear. Force the
shimming gauge against the shims and
thrust washer when checking the fit.
Thickness gauge:
YU-26900-8
YU-26900-9
4. If the thickness gauge at the M specifi-
cation will not fit, then remove or add
the shim(s) until the thickness gauge
just fits between the tool surfaces.
Available shim thickness:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40
and 0.50 mm
6-21
E