192 5 HARD START AND NO START DIAGNOSTICS
Figure 237 High-pressure oil hose with test
fittings installed
1. Air chuck
2. Shut-off valve
3. Fitting, 13/16-16 NPT
4. High-pressure hose
5. Oil level gauge
1. Install 13/16-16 NPT fitting, shut-off valve, and air
chuck fitting to high-pressure oil hose connected
to cylinder head.
WARNING: To avoid serious personal
injury, possible death, or damage to
the
engine or vehicle, do the following
:
• Install an inline shut-off valve.
If system does not leak when air is app
lied,
the system will maintain pressur
e.
When hose is removed, oil will be r
eleased
with air pressure.
• Use inlin e shut-off valve to cont
rol and
contain bleed-offpressure mix
ture (air and
oil).
2. Remove oil level gauge from oil fill tube.
3. Close shut-off valve.
4. Connect shop air supply line to test hose.
5. Apply 689 kPa (100 psi) of pre ssure. Slowly open
the shut-off valve.
6. Listen for an air leak in the crankcase through the
oil fill tube.
NOTE: Engines with engine brake option will have
a small amount of air passing through the system.
Air will pass through brake shut-off valve into the
brake oil gallery. The air will leak off through the
actuator pistons a nd the relief valve at the end of
the rail.
7. Record results on Diagnostic Form.
• If a leak is not heard, check previous test
results.
• If a leak is heard, check components under
the valve cover. Continue with step 8.
8. Close inline sh ut-off va lve to s to p air flow.
9. Remove the valve cover following procedures in
the Engine Service Manual.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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