Yanmar YM276 Service Manual page 128

Crankshaft. Main Bearings, and Flywheel
20-1
5-5
1. Examine flywheel ring gear for chipped or broken teeth
2. Remove ring gear by placing the flywheel on
a
flat surface, and
driving off ring gear with a punch.
3. Install new ring gear b y heating gear t o 1 4 8 ' ~ ( 3 0 0 ' ~ ) using
either heated oil, oven heat, or flame heat.
I f flame heat is used, be sure gear i s heated uniformly around
c~rcumference. DO NOT OVERHEAT. SEE CAUSION.
Overheating may also destroy original heat treatment of gear.
4. Make sure the ring gear direction to the flywheel. The side
grinded a t the bottoms of teeth must be faced towards starter
pinion gear.
A
Oil fumes or oil can ignite above 1 9 3 ' ~ ( 3 8 0 ' ~ ) . Use
a thermometer and d o not exceed 1 8 2 " ~ (360°F). Do
not allow a flame or heating element t o be i n direct contact
with the oil Heat the oil in a wellventilated area. Plan
a safe handling procedure t o avoid burns.
5. Tap heated gear into place against flywheel shoulder.
/-.
C l u t c h S h a f t ( M a i n Drive S h a f t ) P i l o t Bushing
1. Measure 1.D. of clutch shaft bushing, and O.D. of clutch shaft.
2.
Compare measurements taken with the following specifications.
PILOT BUSHING SPECIFICATIONS
New Parts
Bushing
1.D
Clutch shaft
O.D.
. . . . .
Bushing-to-shaft
. . . .
.
.
.
. . . . . . . . . . . .
0.3 m m
Clearance 10.012 in.)
3. Remove bushing by using Pilot Busing puller.
4. When installing pilot bushing, drive in until flush with clutch
side of flywheel.
Make sure tangs on bearings f i t in recesses in bearing housing.
SME2760111-8304 YMZ76and 2760
~ ; ~ o m a r a . Printed in Japan