Selecting The Forward Gear Shims - Yamaha F150A Service Manual

LOWR
2. Calculate the reverse gear shim thick-
ness (T1) as shown in the examples
below.
NOTE:
"F" is the deviation of the lower case dimen-
sion from standard. The "F" mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the "F"
mark is unreadable, assume that "F" is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Reverse gear shim thickness (T1) =
29.10 + F/100 – M1
Example:
If "M1" is 28.25 mm and "F" is (+5), then
T1 = 29.10 + (+5)/100 – 28.25 mm
= 29.10 + 0.05 – 28.25 mm
= 0.90 mm
3. Select the reverse gear shim(s) (T1) as
follows.
Calculated numeral
at 1/100 place
1, 2
3, 4, 5
6, 7, 8
9, 10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
6-57
Lower unit
Rounded numeral
0
2
5
8
Example:
If "T1" is 0.90 mm, then the reverse gear
shim is 0.88 mm.
If "T1" is 1.15 mm, then the reverse gear
shim is 1.12 mm.

Selecting the forward gear shims

1. Install the thrust washer 1 and taper
roller bearing 2 onto the forward gear.
2. Measure the gear height (M2) from the
thrust washer on the taper roller bearing.
NOTE:
• Select the shim thickness (T2) by using the
specified measurement(s) and the calcula-
tion formula.
• Measure the forward gear at three points to
find the height average.
T2
S63P6790
63P3F11