67
Disassembly/Inspection and Service
66 690 07 Rev. -- KohlerEngines.com
Disassemble Cylinder Heads
NOTE: These engines use a valve stem seal on intake
and exhaust valves. Serial No. 3422000010 and
lower used a seal on intake side only. Always
use new seals when valves are removed from
cylinder head. Replace seals if they are
deteriorated or damaged in any way. Never
reuse an old seal.
1. Remove screws, rocker arms and pivots from
cylinder head(s).
2. Compress valve springs using a valve spring
compressor and remove valve spring keepers.
Remove compressor.
3. With keepers taken out following items can be
removed.
● valve spring retainers
● valve springs
● valve spring caps
● intake and exhaust valves
● valve stem seals (intake valve only)
4. Repeat above procedure for other cylinder head. Do
not interchange parts from one cylinder head with
parts from other cylinder head.
After cleaning, check fl atness of cylinder head and
corresponding top surface of crankcase, using a surface
plate or piece of glass and feeler gauge. Maximum
allowable out of fl atness is 0.076 mm (0.003 in.).
Carefully inspect valve mechanism parts. Inspect valve
springs and related hardware for excessive wear or
distortion. Check valves and valve seat area or inserts
for evidence of deep pitting, cracks, or distortion. Check
clearance of valve stems in guides.
Inspection and Service
Valve Details
EXHAUST VALVE INTAKE VALVE
EXHAUST
INSERT
INTAKE
INSERT
H
H
G
G
E
E
F
F
A
A
C
D
D
B
B
Dimension Intake Exhaust
A Seat Angle 89° 89°
B Insert O.D. 36.987/37.013 mm (1.4562/1.4572 in.) 32.987/33.013 mm (1.2987/1.2997 in.)
C Guide Depth 4 mm (0.1575 in.) 6.5 mm (0.2559 in.)
D Guide I.D. 7.038/7.058 mm (0.2771/0.2779 in.) 7.038/7.058 mm (0.2771/0.2779 in.)
E Valve Head Diameter 33.37/33.63 mm (1.3138/1.3240 in.) 29.37/29.63 mm (1.1563/1.1665 in.)
F Valve Face Angle 45° 45°
G Valve Margin (Min.) 1.5 mm (0.0591 in.) 1.5 mm (0.0591 in.)
H Valve Stem Diameter 6.982/7.000 mm (0.2749/0.2756 in.) 6.970/6.988 mm (0.2744/0.2751 in.)
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