Group 150
Observable Diagnostics and Tests
04
150
1
OUO1004,0000BE7 –19–06NOV00–1/1
About this Section of the Manual
This section of the manual contains necessary
information to diagnose problems with the base engine
lubrication and cooling systems. This section is divided
into two areas: diagnosing malfunctions and testing
procedures. The diagnosing malfunction areas are
further divided into the following headings, containing
the following symptoms:
• (L) Diagnosing Lubrication System Malfunctions:
– L1 - Excessive oil consumption
– L2 - Engine oil pressure high
– L3 - Engine oil pressure low
• (C) Diagnosing Cooling System Malfunctions
– C1 - Coolant temperature above normal
– C2 - Coolant temperature below normal
– C3 - Coolant in oil or oil in coolant
Procedures for diagnosing some of the above
symptoms are formatted such that a test or repair is
recommended, then based on the results another test
or repair is recommended. Other symptoms are
formatted in a symptom - problem - solution format. In
these symptoms, the problems are arranged in the
most likely or easiest to check first. Symptoms
arranged in both formats refer to testing procedures in
the second part of this section. The second part of this
section of the manual contains the following testing
procedures:
• Lubrications System Testing Procedures:
– Check engine oil pressure
– Check for excessive crankcase pressure (blow-by)
– Check for turbocharger oil seal leak
• Cooling System Testing Procedures:
– Inspect thermostat and test opening temperature
– Pressure test cooling system and radiator cap
– Check for head gasket failures
• Air Supply and Exhaust Systems Testing Procedures
– Measure intake manifold pressure (turbo boost)
– Check for intake and exhaust restrictions
– Test for intake air leaks
– Check for exhaust air leaks
CTM100 (06APR04)
04-150-1
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=349
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