4 ENGIN E SY M PTOMS DIAGNOSTICS 129
• If mechanical gauge and EST read values
withadifferencegreaterthan+/-14kPa(+/-2
psi), perform Electronic Control Systems
Diagnostics for the EOP circuit as described
in Se ction 7 in this Manual.
• If instrument panel engine oil pressure gauge
reads a different value than the EST and
mechanical gauge refer to the Electrical
System Troubleshooting Guide for the model
and year of vehicle.
Oil Pre ss u r e Regulator In spection
Figure 151 Oil pressure regulator
1. Remove and inspect oil pressure regulator as
describedintheEngine Service Manual.
• The oil pressure regulator piston should m ove
freely in its bore.
• If oil pressure regulator is functional and
passes inspection, install regulator following
the procedure in the Engine Service Manual.
Go to “Oil and Crankcase Inspection” (page
129) in this section.
Oil and Crankcase Inspection
1. Drain oil from engine. Inspect oil drain plug
magnet, drained oil and oil filter f or foreign debris.
• An oil sample should be taken to determine
level of engine wear metals and contaminants
in the oil.
Figure 152 Bottom of engine
Figure 153 Oil pickup tube assembly and gasket
1. Oil pickup t ube assembly
2. Gasket
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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