Kohler Command Pro CV173 Service Manual page 50

Disassembly/Inspection and Service
3. Top compression ring (top groove): Install top
compression ring using a piston ring expander tool.
Make sure identifi cation mark is up or colored dye
stripe (if contained) is left of end gap. Adjust ring
gaps.
Remove Crankshaft
Remove crankshaft and thrust washer.
Inspection and Service
Inspect gear teeth of crankshaft and cam gear. If any
teeth are badly worn or chipped, or if some are missing,
replacement of crankshaft will be necessary.
Inspect crankshaft bearing surfaces for scoring,
grooving, etc. Measure running clearance between
crankshaft journals and their respective bearing bores.
Use an inside micrometer or telescoping gauge to
measure inside diameter of both bearing bores in vertical
and horizontal planes. Use an outside micrometer to
measure outside diameter of crankshaft main bearing
journals. Subtract journal diameters from their respective
bore diameters to get running clearances. Check results
against values in Specifi cations and Tolerances. If
running clearances are within specifi cation, and there
is no evidence of scoring, grooving, etc., no further
reconditioning is necessary. If bearing surfaces are worn
or damaged, crankcase and/or closure plate will need to
be replaced.
Inspect crankshaft keyway. If worn or chipped,
replacement of crankshaft will be necessary.
Inspect crankpin for score marks or metallic pickup.
Slight score marks can be cleaned with crocus cloth
soaked in oil. If wear limits in Specifi cations are
exceeded, it will be necessary to replace crankshaft.
Remove Governor Cross Shaft
A
B
Governor Cross
A
Shaft
C Oil Seal
Remove clip securing governor shaft. Remove shaft and
washer.
Inspection
Inspect oil seal in crankcase and remove it if it is worn or
damaged. Refer to Install Governor Cross Shaft Oil Seal
in Reassembly for new oil seal installation.
50
C
D
B Flat Washer
D Governor Shaft Clip
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Crankcase
Inspection and Service
Check all gasket surfaces to make sure they are free of
gasket fragments and deep scratches or nicks.
Check cylinder wall for scoring. In severe cases,
unburned fuel can dissolve lubricating oil off piston and
cylinder wall. Without lubrication, piston rings would
make metal to metal contact with wall, causing scuffi ng
and scoring. Scoring of cylinder wall can also be caused
by localized hot spots from blocked cooling fi ns or from
inadequate or contaminated lubrication.
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