270 6 PERFORMANCE DIAGNOSTICS
9. Memorize DMM voltage for ICP. After parking
vehicle, record reading on Diagnostic Form; do
not record reading while driving.
•IfICPistospecification, do not continue with
ICP system diagnostics.
• IfICPisnottospecification, continue with
step 10.
• If ICP is still unstable, replace IPR valve
following procedures in the Engine Service
Manual and retest
WARNING: To avoid serious personal injury,
possible death or damage to the engine or vehicle
– comply with the following w hen taking oil
sample:
• When routing oil line, do not run the line too
close to moving parts.
• Do not let the line touch hot engine surfaces.
• Oil is hot. Use protective gloves when taking
oil sample. Use caution handling oil sample to
avoid spilling.
WARNING: To avoid serious personal injury
or possible death, do not allow engine flui
ds to
stay on your skin. Clean your skin and nail
s
with soap and water, or a good hand cle
aner.
Wash or properly throw away clothin
gorrags
containing engine fluids. Engine flu
ids contain
certain elements that may be unhea
lthy for skin
and could even cause cancer.
NOTE: Engine fluids, oil, fuel, and
coolant, can be a
threat to the environment. Nev
er dispose of engine
fluids by putting them in the tr
ash, pouring them on the
ground, in the sewers, in stre
ams or bodies of water.
Collect and dispose of engin
e fluids according to local
regulations.
10. Turn off engine.
Figure 352 Test hose assembly
1. Inline shut-off valve
2. ICP system test adapter
3. Oil sample line
11. Use the ICP system test adapter and inline
shut-off valve to make a test line assembly to
take oil sample.
NOTE: The mechanic is expected to keep the
test line for future diagnostics. Expense the test
line as an essential tool and keep it with other
diagnostic tools. Warranty will not cover the cost
of the test line.
12. Remov e EOT sensor fro m EOT port. Oilwillspill
out. Quickly install test hose assembly.
13. Run engine at high idle for 2 minutes. Record
ICP initially as high idle is set, then again after 2
minutes. Compare the two ICP read ings. ICP that
rises above the spec, at any point during the two
minutes, indicates aeration.
14. Return engine to low idle, take oil sample, and
check for aerated oil.
• If oil is aerated, a large quantity of air bubbles
mixed throughout the oil, or foam build up on
top of the oil will be seen. Correct condition.
• If oil is not aerated, disconnect ICP sensor
and check engine stability. If proble m is
corrected, see “ICP Operational Volta g e
Checks” in Section 7.
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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