Detroit Diesel 4000 Series, Service Manual, Page: 629 / 2706

SERIES 4000 12/16V SERVICE MANUAL
[b] If valves are not damaged, continue inspection. See Figure 362.
1. Bridge Contact Area 3. Neck
2. Valve Stem 4. Head
Figure 362 Checking Valves
2. Visually inspect chrome plating on valves for damage and wear.
[a] If chrome plating is damaged or worn through, replace valves as necessary.
[b] If chrome plating is not damaged or worn, continue inspection.
3. Visually inspect valve stems for indentations and scoring.
[a] If indentations or scoring are found, replace valves stems.
[b] If no indentations or scoring is found, continue inspection.
4. Visually inspect for pitting at transition from valve head to valve stem.
[a] If pitting is found at transition from valve head to valve stem, replace valves as
necessary.
[b] If no pitting is found, continue inspection.
NOTE:
Valve keyways must not be damaged and valve seats must not be burnt.
5. Inspect valves for concentricity and dimensional accuracy.
All information subject to change without notice.
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