18. Valve Lash And Brake Lash; Adjusting Valve Lash - Navistar International DT 466 Diagnostic/Troubleshooting Manual

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18. Valve Lash and Brake Lash

Figure 355
NOTE: If Tests 1-17 meet specifications, engine
operation is good: Test 18 is not necessary.
Figure 356
Purpose
• To check or adjust valve lash for intake and
exhaust valves
• To check or adjust actuator lash for Diamond
Logic® engine brake
Tools
• Feeler gauge
• Straight-blade screwdriver
• Open end wrench (two sizes)
• Torque wrench
• Crows foot (two sizes)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
possible death or damage to the engine or
vehicle, read all safety instructions in the "Safety
Information" section of this manual.
Valve Lash for Intake and Exhaust Valves
During the procedure to adjust valve lash, the
crankshaft is rotated two times:
•
•
If the engine is equipped with the Diamond Logic®
engine brake, corresponding brake actuator lash can
be adjusted before rotating the crankshaft the second
time.

Adjusting Valve Lash

1. Remove valve cover following procedure in
2. Turn crankshaft in the direction of engine rotation
3. Confirm that piston 1 is at TDC compression
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
WARNING: To avoid serious personal injury,
Six valve adjustments are made when piston 1 is
at Top Dead Center (TDC) compression.
Six valve adjustments are made when piston 6 is
at Top Dead Center (TDC) compression.
Engine Service Manual.
to remove gear lash from gear train and align the
timing mark on the damper pulley with the TDC
mark on the front cover.
by turning both push rods by hand to verify that
valves are closed.
• If push rods are loose and turn easily, piston 1
is at TDC compression and valves are closed.
If piston 1 is at TDC compression, see and do
steps 4, 5, and 6.
• If push rods will not turn easily for cylinder 1,
piston 6 is at TDC compression. Confirm that
valves are closed by making sure that push
rods for cylinder 6 are loose and turn easily. If
piston 6 is at TDC compression, see and do
steps 4, 5, and 6.