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Navistar INTERNATIONAL DT 466 User Manual

Navistar INTERNATIONAL DT 466
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6 PERFORMANCE DIAGNOSTICS 257
WARNING: To avoid serious personal injury,
possible death or damage to the engine or vehicle
comply with the following:
When running the engine in the service bay, make
sure the parking brake is set, the transmission is
in neutral, and the wheels are blocked.
8. Run engine to reach normal engine operating
70 °C (158 °F) or higher, before measuring
crankcase pressure.
9. Run engine at high idle (no load) rpm. Allow the
gauge reading to stabiliz e b efore taking pressure
reading.
10. Record crankcase pressure on Diagnostic Form.
If pressure is below specication, continue
Performance D iagnostics.
If pressure is above specication, continue
with step 10.
Figure 335 Discharge port
11. If engine has an air compressor, rem o ve
discharge air line and retest.
If pressure is below specication, repair or
replace air compressor.
If pressure is above specication, continue
with step 11.
12. Disconnect VGT control module and retest.
If pressure is below specication, reconnect
the VGT control module, and retest doing
Test 13 (Air Management) to see if crankcase
pressure increases as turbocharger demand
increases.
If pressure uctuates above and below
specication, as the VGT is cyclin g, replace
the turbocharger.
If disconnecting or cycling the turbocharger
does not bring pressure below specication,
continue with step 12.
13. Do Test 12 Relative Com pression Test to pin point
suspect cylinders.
14. Do Test 11 Injector Disable to further pin point
suspect cylinders.
15. Inspect air induction for dirt ingestion.
Possible Causes
High oil consumption and excessive crankcase
pressure may indicate the following:
Dirt in air induction system
Badly worn or broken rings
Cylinder sleeves badly worn or scored
Leaking valve seals or worn valve guides
A restricted orice in crankcase pressure test
adapter
Failed turbocharger
Failed air compressor
Low oil consumption and excessive crankcase
pressure may indicate the following:
Air com pressor affecting crankc as e pressure.
A restricted orice in crankcase pressure test
adapter
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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Navistar INTERNATIONAL DT 466 Specifications

General IconGeneral
BrandNavistar
ModelINTERNATIONAL DT 466
CategoryEngine
LanguageEnglish

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