Yamaha 250GETO, Service Manual

Page: 195 / 293

6S35H11 6-58
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8
7
6
5
4
3
2
1
Shimming (counter rotation model)
Selecting the forward gear shim
1. Turn the taper roller bearing outer race
1
2 or 3 times to seat the rollers, and then
measure the bearing height (M5) and
(M6) as shown.
NOTE:
9
Select the shim thickness (T2) by using the
specified measurement(s) and the calcula-
tion formula.
9
Measure the forward gear at 4 points to find
the height average.
9
Make of note the each measurement
numerical.
2. Calculate the forward gear shim thick-
ness (T2) as shown in the examples
below.
NOTE:
“R” is the deviation of the lower case dimen-
sion from standard, and “A” is the deviation of
the propeller shaft housing from standard.
The “R” mark
a
is stamped on the trim tab
mounting surface of the lower case, and the
“A” mark
b
is stamped on the propeller shaft
housing in 0.01 mm units. If the “R” mark or
“A” mark is unreadable, assume that “R” and
“A” are zero and check the backlash when
the unit is assembled.
Example:
If “M5” is 21.95 mm and “M6” is 16.78 mm
and “R” is (– 1) and “A” is (– 3), then
T2 = 6.50 + (– 1)/100 – (– 3)/100
– 21.95 + 16.78 mm
= 6.50 – 0.01 + 0.03 – 21.95 + 16.78 mm
= 1.35 mm
6S360460
T2
S69J6715
3
2
1
M5
S69J6720
2
3
1
M6
Shimming plate
2
: 90890-06701
Digital caliper
3
: 90890-06704
Calculation formula:
Forward gear shim thickness (T2) =
6.50 + R/100 – A/100 – M5 + M6
6S35H11_061 05.9.5 14:15 Page 61