Engine Systems - Navistar International DT 466 Diagnostic/Troubleshooting Manual

170

8. Engine Systems

Figure 198
Purpose
To inspect engine and control system for damage
(leaks, open connections, or harness chaffing)
Tools
• Inspection lamp
Procedure
WARNING: To avoid serious personal injury,
possible death, or damage to the engine or
vehicle, read all safety instructions in the "Safety
Information" section of this manual.
1. Inspect fuel supply system (including tank and
lines) for leaks and damage.
2. Check high-pressure oil line from high-pressure
pump to supply manifold for major leaks.
3. Check engine for oil leaks.
4. Inspect cooling system for leaks.
5. Check sensor, relay,
connections. All connections must be seated, in
good condition, and free of damage or corrosion.
NOTE: The engine will not start if the following
components are disconnected or damaged:
• Injection Pressure Regulator (IPR) valve
• Camshaft Position (CMP) sensor
• Crankshaft Position (CKP) sensor
• Electronic Control Module (ECM)
• Injector Driver Module (IDM)
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
5 HARD START AND NO START DIAGNOSTICS
and control module
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
6. Inspect battery cable and fuse connections for
corrosion. All connections must be seated, in
good condition, and free of damage or corrosion.
7. Inspect engine wiring harness for correct routing
and protection against rubbing or chaffing.
8. Check the following components of the air
induction system for leaks:
• Inspect air filter housing for damage or
distortion that could allow unfiltered air into
the engine.
• Inspect air filter housing for end seal
movement. End seal movement is indicated if
the seal contact area is polished. A polished
contact area indicates that unfiltered air has
passed by the filter element and into the
engine.
• Inspect air filter element for end cap dents,
holes, damaged seals, and soot.
• Inspect air intake hoses and clamps for
tightness and positioning over sealing beads.
• Inspect the chassis mounted Charge Air
Cooler (CAC) and piping.
NOTE: Unfiltered air will cause accelerated
engine wear.
9. Record identified problems on Diagnostic Form.
• If problems were identified,
necessary and verify if a hard start and
no start condition still exists.
• If no problems were identified, continue with
the next diagnostic test.
Possible Causes
• Loose or leaking fuel supply lines could cause fuel
system to lose prime.
• Kinked or blocked fuel supply lines can restrict fuel
flow.
• Massive or excessive fuel or oil leaks
• Coolant leaks could indicate serious engine
damage.
• Damaged or incorrectly installed electronic
connectors
• Blockage in the air induction system
EGES-270-1
repair as