Yamaha F50D, Руководство по обслуживанию

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Lower unit
8-33
LOWR
Measuring the forward gear backlash
9 Spray anti-rust lubricant on the gear and
bearings before installation. Do not apply
gear oil to the parts. Otherwise, correct
measurements cannot be obtained.
9 Keep the parts free of foreign material,
such as dirt and lint.
9 When measuring the forward gear or
reverse gear backlash, use the original
bearings and shims.
9
Use heat-resistant gloves, otherwise
burns could result.
9
Remove any flammable substances,
such as gasoline and oil, around the
working area to avoid the risk of fire.
9
Heat the lower case in a well-ventilated
area.
1. Install the original forward gear shim(s)
(T1) and a new taper roller bearing outer
race into the lower case. See “Assem-
bling the lower case” (8-14) step 1–step
2.
TIP:
9 If the original shim(s) are missing, install
new shims with a combined thickness of
0.50 mm.
9 Do not reuse a shim if it is any deformed or
scratched.
2. Install the forward gear assembly, drive
shaft, pinion, and pinion nut. See “Install-
ing the drive shaft” (8-16).
3. Check that drive shaft rotates smoothly.
4. Install the propeller shaft housing assem-
bly. See “Installing the propeller shaft
housing assembly” (8-17).
5. Check that the drive shaft rotates
smoothly.
6. Measure the forward gear backlash. See
“Measuring the forward gear and reverse
gear backlash before disassembly”
(8-24) step 1–step 12.
Adjusting the forward gear shim
thickness (T1)
1. Remove the taper roller bearing outer
race. See “Disassembling the lower
case” (8-13) step 2.
2. Measure the thickness of each original
forward gear shim (T1) in 2 places.
TIP:
Do not reuse a shim if it is deformed or
scratched.
3. Determine the forward gear shim thick-
ness (T1) adjustment in the “Forward
gear shim (T1) selection chart” according
to the truncated average (BL1) from
“Measuring the forward gear backlash”.
Example:
(BL1) = 0.15 mm
a
(T1) adjustment = –0.12 mm
b
from the
“Forward gear shim (T1) selection chart.”
The current shim thickness must be
decreased by 0.12 mm.
å
Backlash measurement (BL1)
∫
Shim thickness adjustment
Forward gear backlash:
0.18–0.53 mm (0.007–0.021 in)
-0.30
-0.20
-0.10
0 00
0 5 10 15 20 25 30 35
-0.20 -0.17 -0.14 -0.12
å
∫
35 30 25 20 15 10 5 0
å
(1/100mm)
∫
(mm)
a
b