6 PERFORMANCE DIAGNOSTICS 277
Brake Lash
• Three actuators are adjusted when piston 1 is at
Top Dead Center (TDC) compression.
• Three actuators are adjusted when piston 6 is at
Top Dead Center (TDC) compression.
Corresponding intake and exhaust valve lash should
be adjusted before rotating the crankshaft.
Figure 361 Brake lash adjustment
Figure 362 Feeler gauge between the valve
bridge and brake actuator
1. Check cold brake lash with a (0.019 in) feeler
gauge between the actuator and valve bridge. If
adjustment is required, loosen the locknut and
turn the actuator adjustment screw until a light
drag is felt.
2. Once bra k e lash is set , tighten the locknut to
27 N·m (20 lbf·ft) and remove the feeler gauge.
Recheck for light drag on feeler gauge. If drag is
too tight or loose, repeat steps 1 and 2.
Possible Causes
• Worn valve train
• Worn valve seat or valve face
• Worn actuator in Diamond Logic® engine brake
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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