Measuring The Reverse Gear Backlash; Adjusting The Reverse Gear Shim Thickness (T2); Reverse Gear Shim (T2) Selection Chart - Yamaha F50D Servise Manual

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"
(8-8) step 3–step 4.
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"
(8-17).
3. Check that the drive shaft rotates
smoothly.
4. Measure the reverse gear backlash. See
"Measuring the forward gear and reverse
gear backlash before
(8-24) step 15–step 17.
Reverse gear backlash:
0.71–1.06 mm (0.028–0.042 in)
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-
Example:
(BL2) = 0.15 mm a
(T2) adjustment = –0.42 mm b from the

"Reverse gear shim (T2) selection chart."

The
decreased by 0.42 mm.
å Backlash measurement (BL2)
∫ Shim thickness adjustment
disassembly"
ness (T2) adjustment in the "Reverse
gear shim (T2) selection chart" according
to the truncated average (BL2) from
"Measuring the reverse gear backlash".
current shim thickness
-0.20
-0.30
-0.40
b
-0.50
-0.60
-0.70
0 5 10 15 20 5
a
å (1/100mm)
å
0 5 10 15 20 5
∫
-0.50 -0.47 -0.44 -0.42 -0.39 4
Shimming (F50D)
must be
50 55 60 65 70 7
50 55 60 65 70 7
-0.22 - -0. 1 8 -0. 1 6 -0. 1 4 -0. 1 0
8-36
0
1
2
3
4
5
6
7
8
9
10
A