Shimming; Selecting The Pinion Shims - Yamaha F200C Service Manual

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Shimming

NOTE:
• Shimming is not required when assembling
the original lower case and inner parts.
• Shimming is required when assembling the
original inner parts and a new lower case.
• Shimming is required when replacing the
inner part(s).

Selecting the pinion shims

1. Calculate the specified value (M0) 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 check the backlash when the unit is
assembled.
Calculation formula:
Specified value (M0) = 1.00 + P/100 mm
Example:
If "P" is (+5), then
M0 = 1.00 + (+5)/100 mm = 1.00 + 0.05 mm
= 1.05 mm
If "P" is (–3), then
M0 = 1.00 + (–3)/100 mm = 1.00 – 0.03 mm
= 0.97 mm
2. Install the drive shaft 1, thrust bearing
2, and drive shaft housing 3 to the
shimming tool.
6-25
Lower unit
3. Install the pinion and pinion nut, and then
tighten the nut to the specified torque.
Pinion shimming gauge III 4:
YB-06441
Pinion nut:
142 N·m (14.2 kgf·m, 103 ft·lb)
4. Measure the clearance (M) between the
shimming tool and the pinion as shown.
NOTE:
Measure the pinion at three points to find the
clearance average.
5. Select the pinion shim(s) (T3).
NOTE:
The sum of T3 and M should not be more
than M0.
Calculation formula:
Pinion shim thickness (T3) = M0 – M
Available shim thicknesses:
0.10, 0.12, 0.15, 0.18, 0.30, 0.40, and
0.50 mm
69J1D11