Yamaha F150A - Measuring the Forward Gear Backlash; Adjusting the Forward Gear Shim Thickness (T2)

8-74
Shimming (counter rotation model)
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8. Calculate the new propeller shaft shim
(T4) thickness.
TIP:
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
9. Remove the special service tools, and
then install the determined propeller
shaft shims.
Measuring the forward gear backlash
• Spray anti-rust lubricant on the gears and
bearings before installation. Do not apply
gear oil to the parts. Otherwise, correct
measurements 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 original
bearings and shims.
1. Install the original forward gear shims
(T2) and propeller shaft housing assem-
bly. See “Installing the propeller shaft
housing assembly” (8-64).
TIP:
• If the original forward gear shims (T2) are
missing, install new shims with a combined
thickness of 0.52 mm.
• Do not reuse a shim if deformed or
scratched.
2. Measure the forward gear backlash. See
steps 3–13 in “Measuring the forward
gear backlash and reverse gear backlash
before disassembly” (8-69).
Adjusting the forward gear shim
thickness (T2)
1. Remove the propeller shaft housing
assembly and forward gear shims (T2).
2. Measure the thickness of original forward
gear shim (T2) in 2 places.
TIP:
Do not reuse a shim if deformed or
scratched.
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm
Forward gear backlash (FL150A):
0.15–0.42 mm (0.0059–0.0165 in)
Forward gear backlash (FL150B):
0.15–0.49 mm (0.0059–0.0193 in)