Periodic Service; Engine Brake Actuator Lash; Brake Lash Adjustment - Navistar INTERNATIONAL DT 466 Service Manual

392

Periodic Service

GOVERNMENT REGULATION: Engine
fluids (oil, fuel, and coolant) may be a hazard
to human health and the environment.
Handle all fluids and other contaminated
materials (e.g. filters, rags) in accordance
with applicable regulations.
or dispose of engine fluids, filters, and
other contaminated materials according to
applicable regulations.
WARNING: To prevent personal injury or
death, read all safety instructions in the "Safety
Information" section of this manual.
WARNING: To prevent personal injury or
death, shift transmission to park or neutral, set
parking brake, and block wheels before doing
diagnostic or service procedures.
WARNING: To prevent personal injury or
death, wear safety glasses with side shields.
Limit compressed air pressure to 207 kPa (30 psi).
WARNING: To prevent personal injury or
death, disconnect the main battery negative
terminal before disconnecting or connecting
electrical components.
WARNING: To prevent personal injury or
death, do not let engine fluids stay on your skin.
Clean skin and nails using hand cleaner and wash
with soap and water. Wash or discard clothing
and rags contaminated with engine fluids.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
DIAMOND LOGIC® ENGINE BRAKE
Recycle
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
NOTE: If the valve cover is removed for any reason,
check six brake piston locknuts. If loose, reset during

brake lash adjustment.

Engine Brake Actuator Lash

During the procedure to adjust brake lash, the
crankshaft is rotated two times:
• 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 can be
adjusted before and after rotating the crankshaft. See
(Adjusting Valve Lash, page150 ) in the "Cylinder Head
and Valve Train" section of this manual.
Brake Lash Adjustment
1. Remove valve cover. See (Valve Cover, page120 )
in the "Cylinder Head and Valve Train" section of
this manual.
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 3
(page392 ) and do steps 4 and 5 for cylinders 1, 3,
and 5.