DIAMOND LOGIC® ENGINE BRAKE 401
Installation
High-pressure Oil Rail
1. Back off all valve lash adjustments. This must
be done to eliminate the possibility of additional
forces on the high-pressure oil rail when mounting
bolts are torqued.
CAUTION: To prevent engine damage, a new backup
ring and injector inlet seal must be installed on all six
injector oil inlet tubes.
CAUTION: To prevent engine damage, when
installing new backup rings, a new backup ring must
match the backup ring removed from the injector oil
inlet tubes.
2. Inspect injector oil inlet adaptors for internal
O-ring extrusion and high-pressure oil leak
paths. Verify that each oil inlet tube is moveable
.
Replace any adaptor having an extruded internal
O-ring, high-pressure oil leak path or seized oi
l
inlet tube.
Figure 643 Groove Measure
ment (M) in injector
oil inlet tube
3. Measuregrooveinthein
jector oil inlet tube.
Figure 644 Injector oil inlet adapter installed in
high-pressure oil rail
1. Injector oil inlet adaptor
2. Backup ring
3. Injector oil inlet seal
4. Oil inlet tube
5. Internal O-ring (not serviceable)
Table53 GrooveMeasurement(M)inOilInlet
Tube and Required Backup Ring
Groov e (M) in Oil Inlet
Tube
Backup Ring
5.080 mm (0.200 in)
Backup ring 1.8 mm
(0.07 in)
4.877 mm (0.192 in)
Backup ring 1.6 mm
(0.06 in)
4.420 mm (0.174 in)
Backup ring 1.1 mm
(0.04 in)
4. Install a new backup ring onto injector oil inlet
tubes, according to the groove measurements
listed in the table.
5. Install new injector inlet seal onto injector oil inlet
tubes.
6. Coat backup rings and injector oil inlet seals with
clean engine oil.
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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