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10.5
Section 10
Inspection and Reconditioning
10
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
4 mm
7.038/7.058 mm
33.37/33.63 mm
45°
1.5 mm
6.982/7.000 mm
Intake Exhaust
89°
32.987/33.013 mm
6.5 mm
7.038/7.058 mm
29.37/29.63 mm
45°
1.5 mm
6.970/6.988 mm
B
A
C
D
D
H
G
Exhaust Valve
EF
A
Exhaust
Insert
Intake
Insert
F
E
G
H
BA
Intake Valve
Figure 10-5. Valve Details.
Normal: Even after long hours of operation a valve
can be reconditioned and reused if the face and
margin are in good shape. If a valve is worn to where
the margin is less than 1/32" do not reuse it. The valve
shown was in operation for almost 1000 hours under
controlled test conditions.
Bad Condition: The valve depicted here should be
replaced. Note the warped head; margin damaged and
too narrow. These conditions could be attributed to
excessive hours or a combination of poor operating
conditions.