Yamaha F200C Service Manual page 216

LOWR
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) = 2.50 + R/100 mm
Example:
If "R" is (+5), then
M0 = 2.50 + (+5)/100 mm = 2.50 + 0.05 mm
= 2.55 mm
If "R" is (–3), then
M0 = 2.50 + (–3)/100 mm = 2.50 – 0.03 mm
= 2.47 mm
2. Install the shim(s) 1, thrust bearing 2,
propeller shaft 3, taper roller bearing 4,
and claw washer 5, and then tighten the
ring nut 6 to the specified torque.
Ring nut wrench: YB-06578
Ring nut 6:
108 N·m (10.8 kgf·m, 78 ft·lb)
3. Set the shimming tool on the taper roller
bearing inner race.
Shimming gauge 7: YB-06440-A
6-53
Lower unit
4. Measure the clearance (M) between the
shimming tool and the propeller shaft
housing 8 as shown.
NOTE:
Measure the clearance at four points to find
the clearance average.
5. Select the forward gear shim(s) (T2).
NOTE:
The sum of T2 and M should not be more
than M0.
S69J6684
69J1D11