CONNECTING RODS
1. Check bearing area (big end)
for
excessive wear, score marks, running and side clearance.
Replace rod hearing on K662
or
rod on K482 and K532 if worn beyond limits stated.
2.
Slightly
undersize rod bearings
(.
002
"
less than standard) are available for K662 engines when
crankpin wear is moderate.
Connecting rods
.010" undersize are availahle for the K482 and
K532.
Connecting rod hearings .010 and .020M undersize are available for K662 for use with
reground crankpin.
VALVES
-
VALVE MECHANISM
Carefully inspect valve mechanism parts. Check valves and valve seat area
or
inserts for
evidence of deep pitting, cracks or distortion. Check clearance of valve stems in guide.
Guides: If a guide is worn beyond limits, it must be replaced.
A
guide with ,010" oversize
O.D.
is
available (K662 only) for cases where guide bore in crankcase is damaged. The guide bore must be
rehored to accommodate the oversize guide.
Replacement guides must he reamed to correct size.
To remove, drive guides into valve chamber and carefully
break protruding end until guide is
completely removed.
Be
careful not to damage block when removing old guide.
Press
new
guides to
depth stated in Clearance Section. Ream to proper
I.
D.
after installation.
Valves and Valve Seats: Consult parts manual for correct valve numbers when replacing valves.
Some applications require special hard faced valves for
both intake and exhaust valves.
Exhaust
valves are always hard faced.
Intake valve seats are machined into block on most
K482 and K532
models although intake inserts may be used in certain applications.
Both intake and exhaust seat
inserts are used on the
K662.
Exhaust valves seat on special hardened inserts on both models.
If valve seat insert is
badly worn, warped, damaged or if seating surface is badly pitted, the
insert must he replaced.
The inserts are a tight press fit in the cylinder head.
A
commercial valve
seat removal tool is recommended for this job.
Since insert removal causes loss of metal in the
insert
bore area in the head, use only Kohler service replacement inserts which have knurled outer
edges to provide proper retention in the head.
Make sure service inserts are properly started and
pressed into bore to prevent cocking of the insert.
FIGURE
10
-
9
--
VALVE, VALVE PORT DIMENSIONS
-
2
CYLINDER MODELS
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