Detroit Diesel 4000 Series, Service Manual, Page: 630 / 2706

SERIES 4000 12/16V SERVICE MANUAL
[a] If valves are not within acceptable limits of concentricity and dimensional accuracy,
replace valves.
[b] If valves are within acceptable limits, continue inspection.
6. Inspect valve seats for minor deviations in concentricity.
[a] If minor deviations in concentricity are found, regrind valve sealing area on a valve
grinding machine or replace valve as necessary.
[b] If no minor deviations in concentricity are found, continue inspection.
NOTE:
Do not straighten valves.
Regrinding Valve Sealing Area
Perform the following steps to regrind valve sealing area:
NOTE:
Do not remove more material than is absolutely necessary to achieve perfect valve
sealing.
All information subject to change without notice.
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