250 6 PERFORMANCE DIAGNOSTICS
4. Interpr et results.
• If a Relative Compression Test and Injector
Disable Test identify a suspect cylinder, check
for a mechanical problem.
• If a Relative Compression Test does
not identify a suspect cylinder, but the
Injector Disable Test does, replace suspect
injector(s).
Possible Causes
• Broken compression rings
• Leaking or bent valves
• Bent push rods
• Bent connecting rods
• Loose fuel injectors
• Scored cylinder sleeve
• Piston damage
• Incorrect valve lash adjustment
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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