250
4. Interpret results.
•
If a Relative Compression Test and Injector
Disable Test identify a suspect cylinder, check
for a mechanical problem.
•
If
a
Relative
not identify a suspect cylinder, but the
Injector Disable Test does, replace suspect
injector(s).
Possible Causes
•
Broken compression rings
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
Compression
Test
does
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
•
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