Detroit Diesel 4000 Series, Service Manual, Page: 625 / 2706

SERIES 4000 12/16V SERVICE MANUAL
6. Visually inspect mating surface of injector sleeve in cylinder head for scoring and wear.
[a] If mating surface of injector sleeve is scored or worn, rub down.
[b] If mating surface of injector sleeve is excessively worn, replace components as
necessary.
[c] If mating surface of injector sleeve is not scored or worn, continue inspection.
7. Inspect thread of injector sleeve in cylinder head for ease of movement and wear.
[a] If thread of injector sleeve does not show ease of movement or is worn, rub down
or replace as necessary.
[b] If thread of injector sleeve shows ease of movement and is not worn, continue
inspection.
8. Visually inspect valve seat in the cylinder head for wear and pitting.
[a] If valve seat is worn or pitted, recondition as necessary.
[b] If valve seat is not worn or pitted, continue inspection.
9. Visually inspect washers and tapers for wear.
[a] If washers or tapers are worn, replace as necessary.
[b] If washers or tapers are not worn, continue inspection.
10. Visually inspect all threads in cylinder head for ease of movement.
[a] If threads do not show ease of movement, rechase threads as necessary.
[b] If threads show ease of movement, continue inspection.
11. Replace cylinder head gaskets and O-rings.
12. Replace valve guides during W6 overhaul.
Checking Cylinder Head Bolts
Perform the following steps to check cylinder head bolts:
1. Check that thread and bolt head mating surfaces are in perfect condition.
[a] If thread and bolt head mating surfaces are not in perfect condition, replace bolts
as necessary.
All information subject to change without notice.
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