Yamaha F30B 2018, Service Manual

Page: 255 / 348

8-35
S himming
4. Measure:
• Forward gear backlash
See step 3 in “Measuring the forward gear
backlash and reverse gear backlash be-
fore disassembly” (8-27).
Out of specification

See “Adjusting the
forward gear shim thickness (T1)” (8-35).
Adjusting the forward gear shim thick-
ness (T1)
1. Remove:
• Tapered roller bearing outer race
• Forward gear shim (T1)
2. Measure:
• Thickness of original forward gear shim
(T1) in 2 places.
TIP:
Do not reuse a shim if deformed or scratched.
3. Select:
• Forward gear shim (T1)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Determine the forward gear shim (T1)
thickness adjustment using the “Forward
gear shim (T1) selection chart” according
to the backlash measurement (BL1) from
“Measuring the forward gear backlash”.
See “Forward gear shim (T1) selection
chart” (A-19).
TIP:
• If the shim thickness adjustment value is pos-
itive, increase the current shim thickness by
that amount and, if the value is negative, de-
crease the current shim thickness by that
amount.
• The gray-colored area on the selection chart
indicates the range of the specified backlash.
Shimming is not required if the measured
backlash is within the gray-colored area.
• The values for the shim thickness adjust-
ments specified in the selection chart are in-
tended to obtain the median value within the
range for the specified forward gear or re-
verse gear backlash.
• The table that follows the selection chart
shows the shim thickness adjustments for the
points marked on the chart.
Example:
Backlash measurement (BL1) = 0.10 mm
“a”
Forward gear shim (T1) thickness adjust-
ment = –0.17 mm “b”
The current shim thickness must be de-
creased by 0.17 mm.
Forward gear backlash
0.18–0.65 mm (0.0071–0.0256
in)
A. Backlash measurement (BL1)
B. Shim thickness adjustment
0 5 10 15 20 25 30 35 A
–0.23 –0.20 –0.17 –0.15 –0.12 –0.09 –0.07 –0.0 B
0.30
0.20
0.10
0
–0.10
–0.20
–0.30
–0.40
0 5 10 15 20 25 30 35
B
(mm)
A (1/100 mm)
a
b