Selecting The Forward Gear Shim - Yamaha F30A Service Manual

LOWR
4. Calculate the pinion shim thickness (T3)
as shown in the examples below.
a
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.
Calculation formula:
Pinion shim thickness (T3) =
M1 – 11.30 – P/100
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.
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
6-23
Lower unit
S67C6064
Rounded number
0.02
0.05
0.08
0.10
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.
3
T1
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.
Digital caliper 2: 90890-06704
Shimming plate 3: 90890-06701
2. Calculate the forward gear shim thick-
ness (T1) as shown in the examples
below.
2
1
M2
S6AG6470J
S67C6103
67C3K11