Yamaha F200B, Service Manual

Page: 469 / 579

8-106
8
Measuring the reverse 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 reverse gear shims.
TIP:
• If the original shims are missing, install new
shims with a combined thickness of 0.65
mm.
• Do not reuse a shim if deformed or
scratched.
2. Install the retainer. See steps 3 and 4 in
“Assembling the lower case” (8-83).
3. Install the thrust bearing and reverse
gear assembly into the lower case.
4. Install the pinion shims, drive shaft, pin-
ion, and oil seal housing. See steps 2–5
in “Installing the drive shaft” (8-28).
(FL200B) See steps 2 and 3 in “Installing
the drive shaft” (8-35) and steps 4 and 5
in “Installing the drive shaft” (8-28).
(FL250G)
5. Install the 2 pieces of washers (90201-
31M00) and propeller shaft housing
assembly (without the O-ring and dog
clutch). See step 2 in “Installing the pro-
peller 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)
6. Check that the drive shaft turns
smoothly.
7. Measure the reverse gear backlash. See
steps 12, 13, and 21 in “Measuring the
forward gear backlash and reverse gear
backlash before disassembly” (8-93).
TIP:
In the “Reverse gear shim (T1) selection
chart,” use the round-down average for the
backlash measurement (BL1).
Adjusting the reverse gear shim (T1)
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 retainer and original reverse
gear shims. See step 2 in “Disassem-
bling the lower case” (8-82).
3. Measure the thickness of each original
reverse gear shim in 2 places.
TIP:
Do not reuse a shim if deformed or
scratched.
4. Determine the reverse gear shim (T1)
thickness adjustment using the “Reverse
gear shim (T1) selection chart” according
to the backlash measurement (BL1) from
“Measuring the reverse gear backlash.”
See “Reverse gear shim (T1) selection
chart” (8-108).
Example:
Backlash measurement (BL1) = 1.00 mm
a
Reverse gear shim (T1) thickness adjustment
= 0.28 mm
b
The current shim thickness must be
increased by 0.28 mm.
Reverse gear backlash:
0.43–0.96 mm (0.0169–0.0378 in)
Shimming (counter rotation model)