Kohler COMMAND CH18, Service Manual

Page: 188 / 232

10.5
Section 10
Inspection and Reconditioning
10
EXHAUST
VALVE
E
G
F
H
D
D
C
A
B
A
B A
F
E
G
H
INTAKE VALVE
EXHAUST
INSERT
INTAKE
INSERT
A
B
C
D
E
F
G
H
Seat Angle
Insert O.D.
Guide Depth
Guide I.D.
Valve Head Diameter
Valve Face Angle
Valve Margin (Min.)
Valve Stem Diameter
Dimension
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.)
Intake
Exhaust
89°
32.987/33.013 mm (1.2987/1.2997 in.)
6.5 mm (0.2559 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
29.37/29.63 mm (1.1563/1.1665 in.)
45°
1.5 mm (0.0591 in.)
6.970/6.988 mm (0.2744/0.2751 in.)
Figure 10-6. Valve Details.
Hard starting or loss of power accompanied by high
fuel consumption may be symptoms of faulty valves.
Although these symptoms could also be attributed to
worn rings, remove and check the valves first. After
removal, clean the valve heads, faces, and stems with a
power wire brush. Then, carefully inspect each valve for defects such as a
warped head, excessive corrosion, or a worn stem
end. Replace valves found to be in bad condition. A
normal valve and valves in bad condition are shown
in the accompanying illustrations.