Measuring The Forward Gear Backlash; Adjusting The Forward Gear Shim (T1) Thickness - Yamaha F225F Service Manual

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 adapter, original forward gear
shim, thrust bearing, and forward gear
assembly. See "Installing the forward
gear" (8-28).
TIP:
• If the original shim is missing, install a new
shim with a thickness of 2.00 mm.
• Do not reuse a shim if deformed or
scratched.
2. Install the drive shaft, pinion, and drive
shaft ring nut. See steps 1–3 in "Installing
the drive shaft" (8-28).
3. Check that the drive shaft turns smoothly.
4. Install the propeller shaft assembly and
propeller shaft housing assembly. See
steps 1–5 in "Installing the propeller shaft
housing assembly" (8-29).
5. Check that the drive shaft turns smoothly.
6. Measure the forward gear backlash. See
steps 2–9 in "Measuring the forward gear
backlash and reverse gear backlash
before disassembly" (8-39).
Forward gear backlash:
0.04–0.59 mm (0.0016–0.0232 in)
TIP:
In the "Forward gear shim (T1) selection
table," use the round-down average for the
backlash measurement (BL1).
Shimming (regular rotation model)
Adjusting the forward gear shim (T1)
thickness
1. Remove the propeller shaft housing
assembly and propeller shaft assembly.
See "Removing the propeller shaft hous-
ing assembly" (8-16).
2. Remove the drive shaft ring nut, pinion,
and drive shaft. See steps 2 and 3 in
"Removing the drive shaft" (8-23).
3. Remove the forward gear, thrust bearing,
original forward gear shim, and adapter.
See "Removing the forward gear" (8-23).
4. Measure the thickness of the original
forward gear shim in 2 places.
TIP:
Do not reuse a shim if deformed or
scratched.
5. Determine the forward gear shim (T1)
thickness using the "Forward gear shim
(T1) selection table" according to the
backlash measurement
"Measuring the forward gear backlash"
and the current shim thickness. See
"Forward gear shim (T1) selection table"
(8-56).
Example:
Backlash measurement (BL1) = 0.29 mm a
Current forward gear shim thickness = 2.06
mm b
Use the determined shim thickness of 2.03
mm instead of the current shim thickness.
0.27
2.00
2.03
B
2.06
2.09
b
A Backlash measurement (BL1)
B Current shim thickness
(BL1) from
a
(mm)
A
0.28 0.29
2.03
8-54
0
1
2
3
4
5
6
7
8
9
10
A