Selecting The Forward Gear Shim - Yamaha 55DEHD 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 check the backlash when the unit is
assembled.
Calculation formula:
Pinion shim thickness (T3) =
M3 – 31.50 – P/100
Example:
If "M3" is 32.10 mm and "P" is (–5), then
T3 = 32.10 – 31.50 – (–5)/100 mm
= 0.60 + 0.05 mm
= 0.65 mm
5. Select the pinion shim(s) (T3) as follows.
Calculated numeral
at 1/100th place
1, 2
3, 4, 5
6, 7, 8
9, 10
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40 and
0.50 mm
6-27
Lower unit
69D60320
Rounded numeral
2
5
8
10
Example:
If "T3" is 0.43 mm, then the pinion shim is
0.45 mm.
If "T3" is 0.38 mm, then the pinion shim is
0.38 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 (M1) as
shown.
T1
NOTE:
9 Select the shim thickness (T1) by using the
specified measurement(s) and the calcula-
tion formula.
9 Measure the bearing outer race at 4 points
to find the height average.
9 Make a note of each measurement numer-
al.
Shimming plate 2: 90890-06701
Digital caliper 3: 90890-06704
68860530
3
1
M1
2
6B460550
6885J11