Yamaha E115A, Service Manual

Page: 162 / 261

LOWR
6-25 61U5H11
Lower unit
Example:
If “T1” is 0.85 mm, then the forward gear shim
is 0.82 mm.
If “T1” is 0.80 mm, then the forward gear shim
is 0.78 mm.
Selecting the reverse gear shim
1. Install the ball bearing, thrust washer,
and reverse gear onto the propeller shaft
housing.
2. Measure the gear height (M2) from the
thrust washer on the propeller shaft
housing.
2. Calculate the forward gear shim thick-
ness (T1) as shown in the examples
below.
NOTE:
“F” is the deviation of the lower case dimen-
sion from standard. The “F” mark
a
is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the “F”
mark is unreadable, assume that “F” is zero
and check the backlash when the unit is
assembled.
Example:
If “M1” is 23.80 mm and “F” is (+5), then
T1 = 24.6 + (+5)/100 – 23.80 mm
= 24.6 + 0.05 – 23.80 mm
= 0.85 mm
If “M1” is 23.80 mm and “F” is (0), then
T1 = 24.6 + (0)/100 – 23.80 mm
= 24.6 + 0 – 23.80 mm
= 0.80 mm
3. Select the forward gear shim(s) (T1) as
follows.
Calculation formula:
Forward gear shim thickness (T1) =
24.6 + F/100 – M1
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
Calculated numeral
Rounded numeral
at 1/100th place
1, 2 0
3, 4, 5 2
6, 7, 8 5
9, 10 8
6F660520
M2
1
2
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