Example:
If “M1” is 25.30 mm and “F” is (+4), then
T1 = 25.70 + (+4)/100 – 22.30 mm
= 25.70 + 0.04 – 25.30 mm
= 0.44 mm
3. Select the forward gear shim(s) (T1) as
follows.
Example:
If “T1” is 0.44 mm, then the forward gear
shim is 0.42 mm.
If “T1” is 0.50 mm, then the forward gear
shim is 0.48 mm.
Selecting the reverse gear shims
1. Install the ball bearing onto the propeller
shaft housing.
2. Measure the bearing housing height (M2)
as shown.
LOWR
6-49
6F65G11
Lower unit
NOTE:
9 Select the shim thickness (T2) by using the
specified measurement(s) and the calcula-
tion formula.
9 Measure the bearing housing at three
points to find the height average.
3. Calculate the reverse gear shim thick-
ness (T2) as shown in the examples
below.
NOTE:
“R” is the deviation of the lower case dimen-
sion from standard. The “R” mark a is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the “R”
mark is unreadable, assume that “R” is zero
and check the backlash when the unit is
assembled.
Calculation formula:
Forward gear shim thickness (T1) =
25.70 + F/100 – M1
Available shim thicknesses:
0.05, 0.08, 0.12, 0.30, 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
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