10. Intake And Exhaust Restriction - Navistar International DT 466 Diagnostic/Troubleshooting Manual

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10. Intake and Exhaust Restriction

Figure 200
Purpose
To determine if intake or exhaust restriction is causing
hard start or no start conditions
NOTE: High intake or exhaust restriction can cause
a large amount of black smoke when starting the
engine.
Tools
• None
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 the following parts for restriction, damage,
or incorrect installation:
• Air filter inlet and duct (could include hood,
cowling, etc.)
• Hoses and clamps
• Air filter housing, filter element, and gaskets
• Exhaust pipes
• Chassis mounted CAC and piping
• Air filter restriction indicator or gauge
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
5 HARD START AND NO START DIAGNOSTICS
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Figure 201 Low-restriction
Figure 202 High-restriction
NOTE: Intake restriction should be below 25 in H
When the filter element reaches maximum allowable
restriction, the yellow indicator will reach the top of
window and automatically lock in this position.
2. Record concerns on Diagnostic Form.
EGES-270-1
O.
2