Kohler K9J Service Manual page 114

Figure 11-13. Posi-Lock Connecting Rods.
Inspection and Service
Check bearing area (big end) for excessive wear,
score marks, running and side clearances (refer
to Section 1 , "General Information"). Replace rod
and cap is scored or excessively worn.
Service replacement connecting rods are available
in STD crank pin size and .010" undersize. The
.010" undersize rod can be identified by the drilled
hole located in the lower end of the redshank (re-
fer to Figure 11-14) . Always refer to the appropri-
ate parts information to ensure the correct re-
placements are used.
Service Connecting Rod
Standard
1 Service Connecting Rod
0.010" Undersize
Figure 11-14. Standard And .01 0" Undersize
Connecting Rods.
BALANCE GEARS AND STUB SHAFTS
Most K321 and K341 K-Series engines are
equipped with a balance gear system. K91, K161,
and K181 engines do not have balance gears.
Some K241 and K301 engines are equipped with a
balance gear system.
The system consists of two gears and spacer
(used to control end play) mounted on stub shafts
which are pressed into the crankcase. The gears
and spacers are held on the shafts with snap-ring
retainers. The gears are timed with and driven by
the engine crankshaft.
Inspection and Repair
Use a micrometer and measure the stub shaft di-
ameter. If the diameter is less than .4996", re-
place the stub shaft. Use an arbor press to push
old shaft out and new shaft in. Refer to Figure
11-15. The stub shaft must protrude a specific
distance above the stub shaft boss. If the stub
shaft boss is about 7 I 1 6" above the main bearing
boss, press the shaft in until it is . 735" above the
stub shaft boss. On blocks where the stub shaft
boss is only about 1 I 1 6" above the main bearing
boss, press shaft in until it is 1 . 11 0" above the
stub shaft boss. A
318"
spacer must be used with
the shaft which protrudes 1 . 11 0" .
Inspect the gears for worn or chipped teeth and
for worn needle bearings. Use an arbor press and
driver to replace bearings, if required.
BALANCE GEAR BEARING AND BALANCE
GEAR ASSEMBLY
A new needle bearing for the Dynamic Balance
System is now being used on 1 0-1 6 HP Kohler
engines. The new bearing (part number 47030 01)
Ill
has been in use beginning with serial number
9641311 . It is not interchangeable with the old
needle bearing, part number 236506.
11.11