Service and Repairs

87
Disassembly/Inspection and Service
17 690 01 Rev. L KohlerEngines.com
Remove Governor Assembly (Mechanical Governor
Only)
CH245, CH255, CH260, CH270
NOTE: Mark orientation of all parts as governor
assembly is removed.
1. Remove cup and washer from governor gear.
2. Using a suitable drift, drive governor gear shaft from
crankcase.
3. Remove hitch pin and washer from governor cross
shaft.
4. Remove cross shaft from inside crankcase.
CH395
NOTE: Governor gear shaft is pressed into closure
plate, and should not be removed.
NOTE: Take note of orientation of governor gear
components.
1. Governor gear is located in closure plate. To remove
governor gear, pull governor gear off shaft.
2. Remove hitch pin and washer from governor cross
shaft.
3. Remove cross shaft from inside crankcase.
CH440
NOTE: Do not pry on gasket surface of closure plate, as
this can cause damage and leakage.
NOTE: Take note of orientation of governor gear
components.
NOTE: Governor gear shaft is pressed into closure
plate, and should not be removed unless
damaged.
1. Governor gear is located in closure plate. To remove
governor gear, pry underneath gear to lift it off shaft.
2. If governor gear shaft is bent or damaged, remove it
by pulling straight out.
3. Remove hitch pin and washer from governor cross
shaft.
4. Remove cross shaft from inside crankcase.
Inspection
Inspect governor gear teeth. Replace gear if it is worn,
chipped, or if any teeth are missing. Inspect governor
weights. They should move freely in governor gear.
Remove Crankcase and Closure Plate Seals and
Bearings
NOTE: Inspect bearings for signs of wear by rotating
inner race and examine for marring or cracks.
Check to make sure race moves easily and is
not sloppy. If bearing is tight and rotates
smoothly, removal is not necessary. If you feel
any roughness or chattering or bearing is sloppy,
it should be replaced.
1. Remove oil seal from crankcase.
2. Using a suitable press, push crankshaft bearing from
crankcase.
3. Remove oil seal from closure plate.
4. Using a suitable press, push crankshaft bearing from
closure plate.
Crankcase Inspection and Service
Cylinder Bore Detail
NOTE: A 0.25 mm (0.010 in.) oversize piston is
available if resizing is selected. Initially, resize
using a boring bar, then follow procedures for
honing cylinder.
Check all gasket surfaces to make sure they are free of
gasket fragments. Gasket surfaces must also be free of
deep scratches or nicks.
Check cylinder bore 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).