172 5 HARD START AND NO START DIAGNOSTICS
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:
•Airfilter inlet and duc t (could include ho od,
cowling, etc.)
• Hoses and clamps
•Airfilter housing, filter element, and gaskets
• Exhaust pipes
• Chassis m ounted CAC and piping
•Airfi lter restriction indicator or gauge
Figure 201 Low-restriction
Figure 202 High-restriction
NOTE: Intake restriction should be below 25 in H
2
O.
When the filter element reaches maximum allowable
restriction, the yellow indicator will reach th e top of
window and automatically lock in this position.
2. Record concerns on Diagnostic Form.
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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