Yamaha F200B, Service Manual

Page: 465 / 579

8-102
8
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,
and then assemble the propeller shaft
housing assembly. See steps 7–10 in
“Assembling the propeller shaft housing
assembly” (8-74).
TIP:
• If the original shims are missing, install new
shims with a combined thickness of 1.12
mm.
• Do not reuse a shim if deformed or
scratched.
2. Install the propeller shaft housing assem-
bly (without the O-ring and dog clutch).
See step 2 in “Installing the propeller
shaft housing assembly” (8-84) and step
4 in “Installing the propeller shaft housing
assembly” (8-29). (FL200B) See step 2 in
“Installing the propeller shaft housing
assembly” (8-84) and step 4 in “Installing
the propeller shaft housing assembly” (8-
35). (FL250G)
3. Check that the drive shaft turns
smoothly.
4. Measure the forward gear backlash. See
steps 2–14 in “Measuring the forward
gear backlash and reverse gear backlash
before disassembly” (8-93).
TIP:
In the “Forward gear shim (T2) selection
chart,” use the round-down average for the
backlash measurement (BL2).
Adjusting the forward gear shim (T2)
thickness
1. Remove the propeller shaft housing
assembly. See step 1 in “Removing the
propeller shaft housing assembly” (8-16)
and step 2 in “Removing the propeller
shaft housing assembly” (8-73).
(FL200B) See step 2 in “Removing the
propeller shaft housing assembly” (8-22)
and step 2 in “Removing the propeller
shaft housing assembly” (8-79).
(FL250G)
2. Remove the original forward gear shim.
See step 2 in “Disassembling the propel-
ler shaft housing assembly” (8-73).
3. Measure the thickness of each original
forward gear shim in 2 places.
TIP:
Do not reuse a shim if deformed or
scratched.
4. Determine the forward gear shim (T2)
thickness adjustment using the “Forward
gear shim (T2) selection chart” according
to the backlash measurement (BL2) from
“Measuring the forward gear backlash.”
See “Forward gear shim (T2) selection
chart” (8-104).
Example:
Backlash measurement (BL2) = 0.90 mm
a
Forward gear shim (T2) thickness adjustment
= 0.18 mm
b
The current shim thickness must be
increased by 0.18 mm.
Forward gear backlash:
0.46–0.82 mm (0.0181–0.0323 in)
Shimming (counter rotation model)