Detroit Diesel 4000 Series, Service Manual, Page: 676 / 2706

SERIES 4000 12/16V SERVICE MANUAL
C 051.05.08 – INSPECTION AND REPAIR
Perform the following steps to inspect and repair the camshaft:
1. Clean camshaft.
2. Pre-polish bearing journals and cams with emery cloth.
3. Using the magnetic crack-testing method with fluorescent magnetic powder, check
camshaft for cracks.
[a] If cracked, replace camshaft.
[b] If camshaft is not cracked, continue inspection.
4. Check cam bearing surface, journal surfaces and roller tracks for scoring, wear and
indentations.
[a] If cam bearing surface, journal surfaces and roller tracks show signs of scoring, wear
or indentations, replace cam.
[b] If cam bearing surface, journal surfaces and roller tracks do not show signs of
scoring, wear or indentations, continue inspection.
5. Check gear mating surface for wear or damage.
[a] If gear mating surface is worn or damaged, rub down with oilstone
[b] If gear mating surface is beyond repair, replace component.
[c] If gear mating surface is not worn or damaged, continue inspection.
6. Check surface condition of gear teeth with magnifying glass.
[a] If gear teeth are worn, replace gear.
[b] If gear teeth are not worn, continue inspection.
7. Remove minor scoring, wear and indentations by polishing with emery cloth; if necessary,
machine to DDC specifications or replace camshaft.
NOTE:
Ensure parts are perfectly clean.
Checking Hardness of Cam and Journal
Perform the following steps to check hardness of cam and journal:
All information subject to change without notice.
C -530
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