Detroit Diesel 4000 Series, Service Manual, Page: 1337 / 2706

SERIES 4000 12/16V SERVICE MANUAL
C 185.05.08 – INSPECTION AND REPAIR
Perform the following steps for inspection and repair of the air cooling system:
1. Visually inspect oil filter cores for metal contamination.
[a] If oil filter cores show metal contamination, replace cores as necessary.
[b] If oil filter cores do not show metal contamination, continue inspection.
2. Clean all components.
3. Visually inspect components for damage.
[a] If components are damaged, machine components as necessary.
[b] If damage is beyond repair, replace components as necessary.
[c] If components are not damaged, continue inspection.
4. Visually inspect cooler insert for damage.
[a] If cooler insert is damaged, replace component.
[b] If no damage is found, continue inspection.
5. Visually inspect oil cooler housing for cracks with red penetrant dye.
[a] If cracks are detected, replace component.
[b] If no cracks are detected, continue inspection.
6. Visually inspect all sealing, mating and sliding surfaces for wear, scoring and indentations.
[a] If sealing, mating and sliding surfaces are worn, scored or indented, remove minor
damage by rubbing down with an emery cloth or an oilstone.
[b] If damage is beyond repair, replace components as necessary.
[c] If sealing, mating and sliding surfaces are not worn, scored or indented, continue
inspection.
7. Visually inspect threads of components for wear or damage.
[a] If threads are worn or damaged, rechase threads.
[b] If damage is beyond repair, replace components as necessary.
[c] If threads are not worn or damaged, continue inspection.
8. Replace gaskets, sealing rings and O-rings.
9. Ensure that oil chambers and oil passages are perfectly clean.
Cleaning Cooler Cores on Coolant Side
Perform the following steps for cleaning cooler cores in coolant side:
NOTE:
The oil cooler housing must be replaced if metal debris has penetrated the engine oil
system, for example, in event of piston scuffing or damage to bearings.
All information subject to change without notice.
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