Selecting The Reverse Gear Shims - Yamaha F150A Service Manual

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:
Forward gear shim thickness (T1) =
28.60 + F/100 – M1
Example:
If "M1" is 28.08 mm and "F" is (+5), then
T1 = 28.60 + (+5)/100 – 28.08 mm
= 28.60 + 0.05 – 28.08 mm
= 0.57 mm
3. Select the forward 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
Example:
If "T1" is 0.57 mm, then the forward gear
shim is 0.55 mm.
If "T1" is 0.60 mm, then the forward gear
shim is 0.58 mm.
63P3F11
Rounded numeral
0
2
5
8
Shimming (regular rotation model)

Selecting the reverse gear shims

1. Install the ball bearing, thrust washer,
and reverse gear onto the propeller shaft
housing.
2. Measure the gear height (M2) from the
thrust washer on the propeller shaft
housing.
T2
NOTE:
• Select the shim thickness (T2) by using the
specified measurement(s) and the calcula-
tion formula.
• Measure the reverse gear at three points to
find the height average.
Shimming plate 1: 90890-06701
Digital caliper 2: 90890-06704
1
2
3
S63P6450
4
5
6
7
8
9
6-28