Detroit Diesel 4000 Series, Service Manual, Page: 632 / 2706

SERIES 4000 12/16V SERVICE MANUAL
5. If necessary, recondition valve stem end (1) on device provided on valve grinding
machine. See Figure 364.
1. Valve Stem End
Figure 364 Reconditioning Valve Stem End
6. Measure valve length.
[a] If limit values are not achieved, replace valve as necessary.
[b] If limit values are achieved, continue inspection.
7. Using the surface crack-testing method with fluorescent penetrant dye, check valves
for cracks.
[a] If cracks are found, replace valves as necessary.
[b] If no cracks are found, continue inspection.
Inspecting Valve Springs
Perform the following steps to inspect the valve springs:
1. Visually inspect valve springs for surface cracks or broken coils.
[a] If surface cracks or broken coils are found, replace valve springs as necessary.
[b] If no surface cracks or broken coils are found, continue inspection.
2. Visually inspect valve springs for indentations, flatness, burring and deformation.
All information subject to change without notice.
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