Detroit Diesel MBE 4000 Service Manual page 205

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9. Inspect the valve guides for wear. See Figure 1-121. Listed in Table 1-41 are the
specifications.
1. Valve Guide
2. Cylinder Head
Figure 1-121
Description
Normal
Wear Limit
Table 1-41
[a] Measure the inside diameter of the valve guide by inserting the go/no go gauge
(J 46181 or 636 589 00 21 00) into the valve guide.
[b] Replace the valve guide if the larger diameter end of the go/no go gauge tool
(J 46181 or 636 589 00 21 00)fits into either end of the guide.
10. Clean the valves thoroughly. Remove any traces of combustion residue.
11. Check the valves to see if they can be re-used. Replace the valves if the stem ends are
damaged or bent, if the valve grooves are deformed, if the seat is burned, or if the chrome
surface of the shaft is not entirely intact.
12. Check the following critical valve dimensions, and repair as necessary. See Figure 1-122
to determine the dimensions given in the table. Listed in Table 1-42 are the dimensions.
Valve stem diameter (A)
All information subject to change without notice.
6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION
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Measuring the Inside Diameter of the Valve Guide
Inside Diameter of Valve Guide
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MBE 4000 SERVICE MANUAL
mm (inch)
9.000-9.022 (0.3543-0.3552)
9.050 (0.3563)
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1-157
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