118 4 ENGINE SYMPTOMS DIAGNOSTICS
Figure 134 EGR cooler pressure test
1. EGR cooler p ressure test plates (2)
2. Air pressure regulator
9. Bolt EGR cooler pressure test plates to each end
of the cooler assembly.
10. Use regulated air pressure and apply no more
than 207 kPa (30 psi) to the EGR cooler assembly.
11. Subme rg e the EGR cooler assem b ly into a tank
of water. Watch for air bubbles leaving the cooler.
• If a leak is noticed, replace the EGR cooler.
• If a leak is not noticed, install the EGR cooler.
12. Fill cooling system.
13. Pressurize cooling system t o 96 kPa (14 psi).
14. Inspect cylinder head (removing components as
required) for cracks, porosity, and leaking cup
plugs.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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