Measuring The Forward Gear Backlash; Adjusting The Forward Gear Shim Thickness (T2) - Yamaha F150A Service Manual

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
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40,
0.50 mm
9. Remove the special service tools, and
then install the determined propeller
shaft shims.
Shimming (counter rotation model)

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).
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)
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.
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