Detroit Diesel MBE 4000 Service Manual page 200

1.19 VALVES
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3. Measure the valve standback listed in Table 1-39, from the cylinder head. See Figure 1-117.
NOTE:
The valve standback is the difference in height between the lower contact surface of the
cylinder head and the valve head, when it is touching the valve seat.
1. Cylinder Head
2. Valve Head
Figure 1-117
Valve Type
Intake
Intake
Exhaust
Exhaust
Table 1-39 Valve Standback
[a] Set the scale of the dial gauge to "0" (zero).
[b] Move the dial gauge enough so that its probe is touching the valve head.
[c] If the gauge reads between 0.7 and 1.1 mm (0.03 and 0.04 inch), the valve standback
is within specifications for new cylinder heads. Skip down to "Install the cylinder
head..."If the gauge reads less than 0.7 mm (0.03 inch), or more than 1.1 mm (0.04
inch), the valve standback is not within specifications.
1-152
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Measuring Valve Standback
Description
Normal
Wear Limit
Normal
Wear Limit
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3. Valve Stem
mm (inch)
0.7-1.1 (0.03-0.04)
1.6 (0.06)
0.7-1.1 (0.03-0.04)
1.6 (0.06)
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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All information subject to change without notice.
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