Service Manual

Flywheel and Ring Gear Inspection
1. Check ring gear teeth for wear or damage and re-
place ring gear if necessary
. If ring gear teeth are dam-
aged or broken, check starter motor pinion. To replace
ring gear, strike ring gear at several points on out circum-
ference. Install ring gear, then heat ring gear to 260 –
280C (500 – 536F) for shrink fit.
Figure 232
2. Inspect flywheel clutch disk surface for stepped wear
,
streaking or seizure and replace if necessary. Check fly-
wheel runout and replace if runout exceeds the limit.
Flywheel
Ring gear Ball bearing
Ring gear
Flywheel
Flywheel runout limit 0.13 mm (.005 in.)
3. Check ball bearing for smooth rolling and noise.
Check (sealed) bearing for grease leakage. Replace
bearing if necessary.
Figure 233
Crankshaft Reassembly
1. When installing crankshaft bearings note that there is
an oil groove in the upper bearing and no oil groove in
the lower bearing.
Upper bearing
Lower bearing
Grooved
Not
grooved
Figure 234
2. Install thrust bearing so oil groove faces out.
Oil groove
Figure 235
Liquid Cooled
Gas Engine
Workman 3000/4000 Series
Page 3 – 107
Liquid Cooled Gas Engine