Observable Diagnostics and Tests
04
150
3
– – –1/1
2 Excessive Crankcase
Pressure Check
Check for excessive crankcase pressure. See CHECK FOR EXCESSIVE ENGINE
CRANKCASE PRESSURE (BLOW-BY) in this Group.
No fumes and no
dripping oil observed:
GO TO 3
Excessive fumes or
dripping oil observed;
appears to be caused
by boost pressure:
Check the turbocharger,
repair/replace as needed.
See TURBOCHARGER
FAILURE ANALYSIS in
Section 02, Group 080.
Excessive fumes or
dripping oil observed;
does not appear to be
caused by boost
pressure:
Excessive blow-by, not
caused by boost pressure
is most likely caused by
faulty piston rings/cylinder
liners not providing an
adequate combustion
seal.
Perform a compression
test to verify this. See
DST ENGINE TEST
INSTRUCTIONS -
RELATIVE
COMPRESSION TEST in
CTM115, Section 04,
Group 160. OR See DST
ENGINE TEST
INSTRUCTIONS -
RELATIVE
COMPRESSION TEST in
CTM188, Section 04,
Group 160
– – –1/1
3 Turbocharger Oil Seal
Leak Test
Check for turbocharger oil seal leaks. See CHECK FOR TURBOCHARGER OIL SEAL
LEAK in this Group.
No signs of oil leakage:
GO TO 4
Signs of oil leakage
present:
Investigate problems
associated with oil
leakage as outlined in the
test procedure, perform
necessary repairs and
retest.
CTM100 (06APR04)
04-150-3
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=351
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