Kohler CV11-16, Service Manual

Page: 117 / 150

10.5
Section 10
Inspection and Reconditioning
10
Cylinder Head and Valves
Inspection and Service
Carefully inspect the valve mechanism parts. Inspect
the valve springs and related hardware for excessive
wear or distortion. Check the valves and valve seat
area or inserts for evidence of deep pitting, cracks,
or distortion. Check clearance of the valve stems
in guides. See Figure 10-5 for valve details and
specifi cations.
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 fi rst. After
removal, clean the valve heads, faces, and stems with
a power wire brush. Then, carefully inspect each valve
for defects such as warped head, excessive corrosion,
burned face, or 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.
89°
33.987/34.013 mm
6.5 mm
7.033/7.058 mm
31.37/31.63 mm
45°
1.5 mm
6.970/6.988 mm 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°
37.987/38.013 mm
6.5 mm
7.033/7.058 mm
35.37/35.63 mm
45°
1.5 mm
6.982/7.000 mm
Intake Exhaust
C
D
D
H
G
Exhaust Valve
E
F
Exhaust
Insert
Intake
Insert
G
H
Intake Valve
A
A
B
B A
F
E
Figure 10-5. Valve Details.