Yamaha F40B - Selecting the Reverse Gear Shim

67C3K11 6-24
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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 “M2” is 22.30 mm and “F” is (+5), then
T1 = 22.75 + (+5)/100 – 22.30 mm
= 22.75 + 0.05 – 22.30 mm
= 0.50 mm
If “M2” is 22.30 mm and “F” is (–3), then
T1 = 22.75 + (–3)/100 – 22.30 mm
= 22.75 – 0.03 – 22.30 mm
= 0.42 mm
3. Select the forward gear shim(s) (T1) as
follows.
Example:
If “T1” is 0.50 mm, then the forward gear
shim thickness is 0.48 mm.
If “T1” is 0.42 mm, then the forward gear
shim thickness is 0.40 mm.
Selecting the reverse gear shim
1. Remove the reverse gear and reverse
gear shim(s) from the propeller shaft
housing.
Calculation formula:
Forward gear shim thickness (T1) =
22.75 + F/100 – M2
Calculated number Rounded number
0.01–0.02 0.00
0.03–0.05 0.02
0.06–0.08 0.05
0.09–0.10 0.08
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
S67C6067
a
Shimming