INSPECTION AND REPAIR OF BASIC ENGINE
6-7
2. Inspecting and repairing flywheel
2.1 Measuring flatness of flywheel
Place the flywheel on a surface plate and move a dial gauge
on the friction surface of the flywheel to measure the
flatness.
Grind the friction surface of the flywheel if the limit is
exceeded.
Measuring flatness of flywheel
2.2 Inspecting ring gear
Inspect the ring gear for a missing tooth or worn teeth, and
if defects are found, replace the ring gear.
2.3 Replacing ring gear
2.3.1 Removing ring gear
(1) Heat the ring gear evenly using an acetylene torch or
other appropriate heat source.
(2) With a rod placed on the periphery of ring gear, tap the
rod with a hammer evenly around the ring gear, and
remove the ring gear.
2.3.2 Installing ring gear
(1) Heat the ring gear evenly up to approx. 150°C [176°F]
with an appropriate heater.
(2) Install the ring gear onto the flywheel with the no-gear-
chamfering side faced to the flywheel.
Note: Do not heat the ring gear excessively.
Removing ring gear
Item Standard Limit
Flywheel flatness
0.15 mm
[0.0059 in.] or less
0.50 mm
[0.0197 in.]
Flywheel
Ring gear
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