Yamaha F150A, Service Manual

Page: 380 / 493

8-73
Shimming (counter rotation model)
Selecting the pinion shim (T3)
See “Selecting the pinion shim (T3)” (8-39).
Selecting the propeller shaft shim
(T4)
1. Install the original propeller shaft shims
(T4).
TIP:
• If the original shims are missing, measure
the free play without any shims.
• Do not reuse a shim if deformed or
scratched.
2. Install the propeller shaft housing
assembly. See “Installing the propeller
shaft housing assembly” (8-64).
3. Turn the propeller shaft 10 turns or more.
4. Set up the special service tools “1” and
“2”.
5. Measure the propeller shaft free play.
6. Round the measurement value to the
1/10 place if out of specification.
TIP:
In the “Propeller shaft shim (T4) selection
table”, use the rounded measurement value
for the free play measurement.
7. Determine the value of propeller shaft
shim (T4) thickness adjustment using the
“Propeller shaft shim (T4) selection table”
according to the free play measurement.
See “Propeller shaft shim (T4) selection
table” (A-15).
TIP:
• If the shim thickness adjustment value is
positive, the current shim thickness must be
increased by that amount and, if the value
is negative, the current shim thickness must
be decreased by that amount.
• The gray-colored cell on the selection table
indicates the specified propeller shaft free
play. Shimming is not required if the mea-
sured propeller shaft free play is 0.25–0.35
mm.
• The values for the shim thickness adjust-
ments specified in the selection table are
intended to obtain the specified propeller
shaft free play of 0.3 mm.
Example:
Free play measurement = 1.1 mm “a”
Propeller shaft shim (T4) thickness adjust-
ment = 0.8 mm “b”
The current shim thickness must be
increased by 0.8 mm.
A. Free play measurement
B. Shim thickness adjustment
Dial gauge set “1”: 90890-01252
Magnetic base B “2”: 90890-06844
Propeller shaft free play:
0.25–0.35 mm (0.0098–0.0138 in)
1
2
(mm)
A
B
1.0 1.1
+0.7 +0.8
a
b