Yamaha F30A Service Manual page 176

LOWR
2. Measure the propeller shaft housing
height (M3) as shown.
2
1
M3'
M3
M3 = M3' – 10 mm
NOTE:
Measure the propeller shaft housing at 4
points to find the height average.
Digital caliper 1: 90890-06704
Shimming plate 2: 90890-06701
3. Calculate the reverse gear shim thick-
ness (T2) as shown in the examples
below.
6-25
Lower unit
1
2
S67C6075
10 mm
(0.39 in)
S67C6076
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:
Reverse gear shim thickness (T2) =
98.00 – M3 + R/100
Example:
If "M3" is 96.79 mm and "R" is (–1), then
T2 = 98.00 – 96.79 + (–1)/100 mm
= 98.00 – 96.79 – 0.01 mm
= 1.20 mm
If "M3" is 96.79 mm and "R" is (+3), then
T2 = 98.00 – 96.79 + (+3)/100 mm
= 98.00 – 96.79 + 0.03 mm
= 1.24 mm
4. Select the reverse gear shim(s) (T2) as
follows.
Calculated number
0.01–0.02
0.03–0.05
0.06–0.08
0.09–0.10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
a
S67C6078
Rounded number
0.00
0.02
0.05
0.08
67C3K11