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 with an acetylene torch or
other appropriate heat source.
(2) Remove the ring gear by striking it evenly around the
periphery with a hammer through a rod.
2.3.2 Installing ring gear
(1) Heat the ring gear evenly up to approx. 100°C [212°F]
with an appropriate heater.
(2) Install the ring gear onto the flywheel with the no-gear-
chamfering side facing to the flywheel.
Note: Do not heat the ring gear excessively.
Removing ring gear
Item Standard Limit
Flywheel flatness
0.08 mm
[0.0031 in.] or less
0.50 mm
[0.0197 in.]
Flywheel
Ring gear
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