Kohler command pro CH742 Service Manual page 54

Disassembly/Inspection and Service
Remove Governor Cross Shaft
1. Remove hitch pin and plain washer, or retainer and
nylon washer from governor cross shaft.
2. Pull cross shaft with small washer out through inside
of crankcase.
Governor Cross Shaft Oil Seal
Cross Shaft Oil Seal Details
A
A 2.0 mm (0.0787 in.)
B Governor Cross Shaft Seal
If governor cross shaft seal is damaged and/or leaks,
replace it using following procedure.
Remove oil seal from crankcase and replace it with a
new one. Install new seal to depth shown using a seal
installer.
Remove Flywheel End Oil Seal
Remove oil seal from crankcase.
54
B
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Crankcase
Inspection and Service
Check all gasket surfaces to make sure they are free of
gasket fragments. Gasket surfaces must also be free of
deep scratches or nicks.
Inspect main bearing (if equipped) for wear or damage.
Replace crankcase using a miniblock or short block as
required.
Check cylinder bore wall for scoring. In severe cases,
unburned fuel can cause scuffi ng and scoring of cylinder
wall. It washes necessary lubricating oils off piston and
cylinder wall. As raw fuel seeps down cylinder wall,
piston rings make metal to metal contact with wall.
Scoring of cylinder wall can also be caused by localized
hot spots resulting from blocked cooling fi ns or from
inadequate or contaminated lubrication.
If cylinder bore is badly scored, excessively worn,
tapered, or out-of-round, resizing is necessary. Use an
inside micrometer to determine amount of wear (refer
to Specifi cations), then select nearest suitable oversize
of either 0.25 mm (0.010 in.) or 0.50 mm (0.020 in.).
Resizing to one of these oversizes will allow usage of
available oversize piston and ring assemblies. First,
resize using a boring bar, then follow these procedures
for honing cylinder.
24 690 34 Rev. D