Yamaha F150A, Service Manual

Page: 384 / 493

8-77
Shimming (counter rotation model)
A. Backlash measurement (BL1)
B. Shim thickness adjustment
4. Calculate the new reverse gear shim (T1)
thickness.
TIP:
• Use the lowest number of shims to obtain
the required shim thickness.
• If the calculated shim thickness cannot be
obtained with a combination of the available
shims, increase or decrease the shim thick-
ness by 0.01 mm.
Calculation formula:
New reverse gear shim (T1) thickness =
Current reverse gear shim thi shim
thickness adjustment
Example:
Use the following formula when the shim
thickness adjustment value is positive.
Current reverse gear shim thickness
= 1.00 mm
Shim thickness adjustment = 0.22 mm
New reverse gear shim (T1) thickness
= 1.00 mm + 0.22 mm
= 1.22 mm
Use the following formula when the shim
thickness adjustment value is negative.
Current reverse gear shim thickness
= 1.00 mm
Shim thickness adjustment = –0.14 mm
New reverse gear shim (T1) thickness
= 1.00 mm + (–0.14 mm)
= 0.86 mm
5. Install the determined reverse gear shims
(T1) and roller bearing outer race.
0 5 10 15 20 25 30 35 A
–0.28 –0.24 –0.21 –0.18 –0.14 –0.11 –0.08 –0.04 B
0.30
0.20
0.10
0
–0.10
–0.20
–0.30
0 5 10 15 20 25 30 35
B
(mm)
A (1/100 mm)
a
b
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm