Section 9
Inspection and Reconditioning
9
9.5
Hard starting or loss of power accompanied by high
fuel consumption may be symptoms of faulty valves.
Although these symptoms could also be a ributed to
worn rings, remove and check the valves fi rst. A er
removal, clean the valve heads, faces, and stems with
a power wire brush.
Figure 9-6. Valve Details.
A
B
C
D
E
F
G
H
Seat Angle
Seat Taper
Guide Depth
Guide I.D.
Valve Head Diameter
Valve Face Angle
Valve Margin (Min.)
Valve Stem Diameter
Dimension
89°
30°
8.5 mm (0.334 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
38.625/38.685 mm (1.5206/1.5230 in.)
45°
1.0 mm (0.0393 in.)
6.982/7.000 mm (0.2749/0.2756 in.)
Intake
Exhaust
89°
30°
8.5 mm (0.334 in.)
7.038/7.058 mm (0.2771/0.2779 in.)
31.625/31.825 mm (1.2450/1.2549 in.)
45°
1.0 mm (0.0393 in.)
6.970/6.988 mm (0.2744/0.2751 in.)
EXHAUST VALVE
INTAKE VALVE
AB
C
D
D
F
E
G
H
F
E
G
H
EXH
INT
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.
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