8-62
Shimming (counter rotation model)
c. Calculate the new propeller shaft shim
(T4) thickness.
Use up to 3 shims to obtain the required shim
thickness.
Calculation formula:
New propeller shaft shim (T4) thickness =
Current propeller shaft shim thickness +
Shim thickness adjustment
Example:
Use the following formula when the shim
thickness adjustment value is positive.
Current propeller shaft shim thickness =
0.8 mm
Shim thickness adjustment = 0.2 mm
New propeller shaft shim (T4) thickness =
0.8 mm + 0.2 mm = 1.0 mm
Use the following formula when the shim
thickness adjustment value is negative.
Current propeller shaft shim thickness =
0.8 mm
Shim thickness adjustment = –0.1 mm
New propeller shaft shim (T4) thickness =
0.8 mm + (–0.1 mm) = 0.7 mm
d. Remove the special service tools, and
then install the determined propeller shaft
shims.
Measuring the forward gear backlash
and reverse gear backlash
• Spray anti-rust lubricant on the gear and
bearings before installation. Do not apply
gear oil to the parts. Otherwise, correct mea-
surements cannot be obtained.
• Keep the parts free of foreign material, such
as dirt and lint.
• When measuring the forward gear or reverse
gear backlash, use the shims of the specified
thickness for the reverse gear shim (T1) and
forward gear shims (T2), and use the shims
of the selected thickness for the pinion shims
(T3).
1. Install:
• Adapter assembly
• Specified reverse gear shim (T1)
• Thrust bearing
• Reverse gear assembly
See “Installing the reverse gear” (8-55).
Do not reuse a shim if deformed or scratched.
2. Install:
• Determined pinion shim (T3)
• Drive shaft
• Pinion
• Pinion nut
• Drive shaft ring nut
See steps (1)–(3) in “Installing the drive
shaft” (8-34).
• Do not reuse a shim if deformed or scratched.
• Check that the drive shaft turns smoothly.
A. Free play measurement
B. Shim thickness adjustment
Available shim thicknesses
Propeller shaft shims
0.10/0.12/0.15/0.18/0.30/0.40/
0.50 mm (FL350BST, LF350SA)
(mm)
A
B
1.0
1.1
+0.7 +0.8
a
b
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