Selecting The Reverse Gear Shims - Yamaha F200C Service Manual

LOWR

Selecting the reverse gear shims

1. Calculate the specified value (M0) as
shown in the examples below.
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:
Specified value (M0) = 0.50 – R/100 mm
Example:
If "R" is (+5), then
M0 = 0.50 – (+5)/100 mm = 0.50 – 0.05 mm
= 0.45 mm
If "R" is (–3), then
M0 = 0.50 – (–3)/100 mm = 0.50 + 0.03 mm
= 0.53 mm
2. Set the shimming tool on the ball bear-
ing.
Shimming gauge I 1: YB-06439
6-27
Lower unit
3. Measure the clearance (M) between the
shimming tool and the ball bearing 2 as
shown.
NOTE:
Measure the ball bearing at three points to
find the clearance average.
4. Select the reverse gear shim(s) (T2).
NOTE:
The sum of T2 and M0 should not be more
than M.
Calculation formula:
Reverse gear shim thickness (T2) =
M – M0
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
69J1D11