Detroit Diesel 4000 Series, Service Manual

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SERIES 4000 12/16V SERVICE MANUAL
7. Install valve rotators on valve guides. See Figure 377.
1. Valve Rotators
Figure 377 Installing Valve Rotators on Valve Guides
8. Visually inspect valve rotators for damage or wear at spring seat or in valve guide bore.
[a] If valve rotators show wear or damage, repair or replace as necessary.
[b] If valve rotators do not show damage or wear, continue inspection.
9. Place valve rotators between fingers of both hands and with light pressure, rotate valve
rotator.
[a] If there is any resistance or valve rotator stops, replace component.
[b] If there is no resistance and valve rotator does not stop, continue inspection.
10. Install outer and inner valve springs.
NOTE:
Valve springs have no "Top/Bottom" marking. Installation position does not matter.
11. Install valve spring retainers.
12. Install pressure plate on valve spring retainer and bolt to base plate.
13. Install manual spindle in valve spring tensioner.
All information subject to change without notice.
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