Selecting The Reverse Gear Shim - Yamaha E115A Service Manual

LOWR
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.
Calculation formula:
Forward gear shim thickness (T1) =
24.6 + F/100 – M1
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.
Calculated numeral
at 1/100th place
1, 2
3, 4, 5
6, 7, 8
9, 10
6-25
Lower unit
Rounded numeral
0
2
5
8
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
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.
1
2
M2
6F660520
61U5H11