150 CYLINDER HEAD AND VALVE TRAIN
Valve Lash for Intake and Exhaust Valves
During the procedure to adjust valve lash, the
crankshaft is rotated two times:
• Six adjustments are made when piston 1 is at Top
Dead Center (TDC) compression.
• Six adjustments are made when piston 6 is at Top
Dead Center (TDC) compression.
If the engine is equipped with the Diamond Logic®
engine brake, corresponding brake actuator lash
(Adjusting Valve Lash, page 150) can be adjusted
before and after rotating the crankshaft the second
time.
Adjusting Valve Lash
1. Remove valve cover (Valve Cover, page120).
2. Turn the crankshaft in the direction of engine
rotation to remove gear lash. Position piston 1 at
TDC compression by observing cylinder 6 rocker
arms in overlap as the vibration damper timing
mark approaches the TDC mark on the front
cover. Cylinder 6 exhaust valve will be closing
(coming up) and the intake valve will be starting
to open (going down).
3. If piston 1 is at TDC compression, see Chart 1
(page151) and do steps 4 and 5 for cylinders 1, 3,
and 5.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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