Kohler K91 Service Manual page 115

1 1 / 1 6 "
NOMI NAL -
PRESS DEPTH
ABOVE
MAIN
BEARING
BOSS
7/16"
3/8"
I F SHAFT PROTRUDES ABOUT
1 1 / 1 6 "
ABOVE STUB SHAFT
BOSS , DO NOT USE
Complete balance gear assemblies are inter­
changeable - and old style gear assemblies have
been superceded with a new gear assembly, part
number 47 042 0 1 .
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 964 1 3 1 1 , the following methods will assist
in identifying the correct bearing :
1 . 0 . of Balance Gear Bore
Method #1
-
� - 236506
. 682 1
.... .6. .6. .6.5.
- 47 030 01
. 6869
0 . 0 . of Old Bearing
Method #2 -
� - 236506
. 6828
.&aN - 47 030 01
. 6875
GOVERNOR G EAR
Inspection
Inspect the governor gear teet h . Look for any evi­
dence of worn , chipped or cracked teet h . If one
1 1 . 1 2
.735"
�
STUB SHAFT
STUB SHAFT
BOSS
SPACER
Figu re Stub Shaft Press Depth.
1 1 -1 5.
1 - 1 / 1 6 "
NOMINAL -
1 . 1 1 0"
PRESS DEPTH
I F SHAFT PROTRUDES ABOUT
ABOVE STUB SHAFT BOSS , USE 3/8"
THI CK SPACER NEXT TO BOSS
or more of these problems is noted , replace the
governor gear.
CAMS HAFT AND CRANKS HAFT
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,
groovi ng , 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 t he crank pin to . 0 1 0 " under­
size . If reground , a . 0 1 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 fi llet blends smoothly with the
crank pin surface . Refer to Figure 1 1 - 1 6 .
STU' SHAn
I
/3/8"
SPACER
1 - 1 / 1 6 "