Exhaust Valve - Kohler command pro CH742 Service Manual

Disassembly/Inspection and Service
Disassemble Cylinder Heads
NOTE: These engines use valve stem seals on intake
valves. Use a new seal whenever valve is
removed or if seal is deteriorated in any way.
Never reuse an old seal.
1. Remove screws, rocker arm pivots and rocker arms
from cylinder head.
2. Compress valve springs using a valve spring
compressor.
Inspection and Service
Valve Details

EXHAUST VALVE

E
G
H
Dimension
A Seat Angle
B Insert O.D.
C Guide Depth
D Guide I.D.
E Valve Head Diameter
F Valve Face Angle
G Valve Margin (Min.)
H Valve Stem Diameter
46
F
C
D
D
Intake
89°
36.987/37.013 mm (1.4562/1.4572 in.)
4 mm (0.1575 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
33.37/33.63 mm (1.3138/1.3240 in.)
45°
1.5 mm (0.0591 in.)
6.982/7.000 mm (0.2749/0.2756 in.)
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3. Once valve spring is compressed, remove following
items.
● Valve spring keepers.
● Valve spring retainers.
● Valve springs.
● Valve spring caps.
● Intake and exhaust valves (mark position).
● Valve stem seals (intake valve only).
4. Repeat above procedure for other cylinder head. Do
not interchange parts from one cylinder head to
other.
B
A
EXHAUST
INSERT
INTAKE
INSERT
A
B
32.987/33.013 mm (1.2987/1.2997 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
29.37/29.63 mm (1.1563/1.1665 in.)
6.970/6.988 mm (0.2744/0.2751 in.)
INTAKE VALVE
F
E
G
H
Exhaust
89°
6.5 mm (0.2559 in.)
45°
1.5 mm (0.0591 in.)
24 690 34 Rev. D