Yamaha F30A, Service Manual

Page: 174 / 285

LOWR
Lower unit
6-23
67C3K11
4. Calculate the pinion shim thickness (T3)
as shown in the examples below.
NOTE:
“P” is the deviation of the lower case dimen-
sion from standard. The “P” mark
a
is
stamped on the trim tab mounting surface of
the lower case in 0.01 mm units. If the “P”
mark is unreadable, assume that “P” is zero
and measure the backlash when the unit is
assembled.
Example:
If “M1” is 11.70 mm and “P” is (+5), then
T3 = 11.70 – 11.30 – (+5)/100 mm
= 11.70 – 11.30 – 0.05 mm
= 0.35 mm
If “M1” is 11.70 mm and “P” is (–3), then
T3 = 11.70 – 11.30 – (–3)/100 mm
= 11.70 – 11.30 + 0.03 mm
= 0.43 mm
5. Select the pinion shim(s) (T3) as follows.
Example:
If “T3” is 0.35 mm, then the pinion shim thick-
ness is 0.35 mm.
If “T3” is 0.43 mm, then the pinion shim thick-
ness is 0.45 mm.
Selecting the forward gear shim
1. Turn the taper roller bearing outer race
1
2 or 3 times to seat the rollers, and
then measure the bearing height (M2) as
shown.
NOTE:
• Select the shim thickness (T1) by using the
specified measurement(s) and the calcula-
tion formula.
• Measure the bearing outer race at 4 points
to find the height average.
2. Calculate the forward gear shim thick-
ness (T1) as shown in the examples
below.
Calculation formula:
Pinion shim thickness (T3)
=
M1 – 11.30 – P/100
Calculated number Rounded number
0.01–0.02 0.02
0.03–0.05 0.05
0.06–0.08 0.08
0.09–0.10 0.10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, 0.50
mm
S67C6064
a
Digital caliper
2
: 90890-06704
Shimming plate
3
: 90890-06701
M2
S6AG6470J
2
3
1
S67C6103
T1