Kohler K9J Service Manual page 115

ABOVE
MAIN
BEARING
BOSS
7/16"
11/16" NOMINAL -
PRESS DEPTH .735"
IF SHAFT PROTRUDES ABOUT
ll/16" ABOVE STUB SHAFT
BOSS, DO NOT USE 3/8" SPACER
~STUB
SHAFT
STUB SHAFT
BOSS
1-1/16" NOMINAL -
PRESS DEPTH 1 .110"
IF SHAFT PROTRUDES ABOUT 1-1/16"
ABOVE STUB SHAFT BOSS, USE 3/8"
THICK SPACER NEXT TO BOSS
Figure 11-15. Stub Shaft Press Depth.
Complete balance gear assemblies are inter-
changeable - and old style gear assemblies have
been superceded with a new gear assembly, part
number 47 042 01.
Critical consideration is required when only the
needle bearing is to be replaced. The engine se-
rial number alone can correctly determine which
needle bearing is involved on original equipment
engines. However should a bearing replacement
be required after a complete balance gear has
been replaced on an engine with a serial number
prior to 9641311 , the following methods will assist
in identifying the correct bearing:
Method #1 - I.D. of Balance Gear Bore
~-
236506
. 6821
.&.6..6..5. -
4 7 030 01
. 6869
Method #2 - O.D. of Old Bearing
~-
236506
.6828
.&aN-
47 030 01
.6875
GOVERNOR GEAR
Inspection
Inspect the governor gear teeth. Look for any evi-
dence of worn, chipped or cracked teeth. If one
11.12
or more of these problems is noted, replace the
governor gear.
CAMSHAFT AND CRANKSHAFT
Inspection and Service
Inspect the gear teeth on both the crankshaft and
camshaft. If the teeth are badly worn, chipped or
some are missing, replacement of the damaged
components will be necessary.
Also, inspect the crankshaft bearings for scoring,
grooving, etc. Do not replace bearings unless they
show signs of damage or are out of running clear-
ance specifications. If crankshaft turns easily and
noiselessly, and there is not evidence of scoring,
grooving, etc., on the races or bearing surfaces,
the bearings can be reused .
Check crankshaft keyways. If worn or chipped,
replacement of the crankshaft will be necessary .
Also inspect the crank pin for scoremarks or me-
tallic pickup. Slight score marks can be cleaned
with crocus cloth soaked in oil. If wear limits, as
stated in Section 1 , "General Information", are ex-
ceeded, it will be necessary to either replace the
crankshaft or regrind the crank pin to .010" under-
size. If reground, a . 01 0" undersize connecting
rod (big end) must then be used to achieve
proper running clearance. Measure the crank pin
for size, taper and out-of-round.
NOTE: If the crank pin is reground, visually check
to ensure that the fillet blends smoothly with the
crank pin surface. Refer to Figure 11-16.