Yamaha F350B - Page 403

8-61
Shimming (counter rotation model)
Selecting the propeller shaft shim (T4)
1. Install:
• Original propeller shaft shim (T4)
See steps (2)–(7) in “Assembling the pro-
peller shaft housing and forward gear” (8-
51).
TIP:
• If the original shims (T4) are missing, mea-
sure the free play without any shims.
• Do not reuse a shim (T4) if deformed or
scratched.
2. Install:
• Specified forward gear shim (T2)
• Propeller shaft assembly
• Propeller shaft housing assembly
• Claw washer (do not bend the tabs)
• Ring nut
See step (1) in “Installing the propeller
shaft housing assembly” (8-53) and steps
(4) and (5) in “Installing the propeller shaft
housing assembly” (8-24).
a. Set up the special service tools “1” and “2”.
b. Measure the propeller shaft free play.
3. Select:
• Propeller shaft shim (T4) thicknesses
a. Select the propeller shaft shim (T4) thick-
nesses if out of specification.
TIP:
Use the rounded measurement value for the
free play measurement.
b. 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 ta-
ble” (A-20).
TIP:
• If the shim thickness adjustment value is pos-
itive, the current shim thickness must be in-
creased by that amount and, if the value is
negative, the current shim thickness must be
decreased by that amount.
• The blue-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 in-
tended 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 in-
creased by 0.8 mm.
Dial gauge set “1”
90890-03238
Dial indicator gauge “1”
YU-03097
Magnet base B “2”
90890-06844
Magnetic base stand “2”
YU-A8438
New
2
1
Free play
0.25–0.35 mm (0.0098–0.0138
in) (FL350BST, LF350SA)