394 DIAMOND LOGIC® EN GINE BRAKE
Figure 621 Measure between valve bridge and
brake actuator
4. Measure brake lash when engine is cold. Put
0.048 mm (0.019 in) feeler gauge (long) (Table
56) between the pivot foot and valve bridge, a
light drag on the feeler gauge should be felt. If
adjustment is required, loosen locknut and turn
actuator adjustment screw.
5. Once brake lash is set, tighten the locknut to
Special Torque (Table 55) and remove the feeler
gauge. Recheck for light drag on feeler gauge. If
drag is too tight or loose, repeat steps 4 and 5.
Corresponding valve lash can be adjusted before
rotating crankshaft.
6. Turn crankshaft 360° in the direction of engine
rotation to remove gear lash from gear train and
realign the timing mark on the damper pulley with
theTDCmarkonthefrontcover.
7. If piston 6 is at TDC compression, see Chart 2
(page393) and do steps 4 and 5 for cylinders 2, 4,
and 6.
Reconditioning
Diagnostic Tests Procedures and Service Parts
See Engine Diagnostic Manual for diagnostic test
procedures. The following service parts are available,
if required after diagnostic testing.
• BCP sensor
• Brake actuator piston assembly
• Brake shutoff valve assembly
• High-pressure oil rail bolt, M8 x 90 (12)
• ICP sensor
• Oil inlet O-ring
• Oil pressure relief valve
•Plugassembly,M12
• Rail end plug assembly (2)
The following reconditioning procedures are provided
to replace specific components determined faulty
during diagnostic tests. A new Brake Shutoff Valve,
BCP sensor, or ICP Sensor can be installed without
removing the high-pressure oil rail, The High-pres
sure
oil rail must be removed to install new brake actuat
or
pistons.
Reconditioning Procedures
NOTE: Remove valve cover. See (Valve Cover, pa
ge
120) in the “Cylinder Head and Valve Train” secti
on of
this manual.
NOTE: If the valve cover is removed for any rea
son,
check six brake piston locknuts. If loos
e, reset during
brake lash adjustment.
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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