Yamaha F50D Servise Manual - page 235
8-36
0
1
2
3
4
5
6
7
8
9
10
A
Measuring the reverse 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 forward gear or reverse
gear backlash, use the original bearing and
shims.
1.
Install a new ball bearing and original
shim(s) onto the reverse gear, and then
install the reverse gear assembly into the
propeller shaft housing. See “Assembling
the propeller shaft housing assembly”
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 propeller shaft housing assem-
bly into the lower case. See “Installing
the propeller shaft housing assembly”
3.
Check that the drive shaft rotates
smoothly.
4.
Measure the reverse gear backlash. See
“Measuring the forward gear and reverse
gear backlash before disassembly”
Adjusting the reverse gear shim
thickness (T2)
1.
Remove the reverse gear. See “Disas-
sembling the propeller shaft housing
assembly” (8-7) step 1.
2.
Measure the thickness of each original
reverse gear shim (T2) in 2 places.
TIP:
Do not reuse a shim if it is deformed or
scratched.
3.
Determine the reverse gear shim thick-
ness (T2) adjustment in the “Reverse
gear shim (T2) selection chart” according
to the truncated average (BL2) from
“Measuring the reverse gear backlash”.
Example:
(BL2) = 0.15 mm
a
(T2) adjustment = –0.42 mm
b
from the
“Reverse gear shim (T2) selection chart.”
The current shim thickness must be
decreased by 0.42 mm.
å
Backlash measurement (BL2)
∫
Shim thickness adjustment
Reverse gear backlash:
0.71–1.06 mm (0.028–0.042 in)
å
(1/100mm)
∫
(mm)
0
5
10 15 20
-0.60
-0.70
-0.50
-0.40
-0.30
-0.20
0
-
-0.39
-0.42
-0.44
-0.47
-0.50
20
15
10
5
å
∫
7
70
65
60
55
50
5
-0.10
-0.14
-0.16
-0.18
-0.22
4
7
70
65
60
55
50
5
b
a
Shimming (F50D)