Engine Oil - Navistar International DT 466 Diagnostic/Troubleshooting Manual

9. Engine Oil

Figure 199
Purpose
To determine if crankcase oil level and oil quality are
correct to ensure operation of the Injection Control
Pressure (ICP) system
Tools
• None
Procedure
WARNING: To avoid serious personal injury,
possible death or damage to the engine or
vehicle, read all safety instructions in the "Safety
Information" section of this manual.
1. Park vehicle on level ground.
2. Check oil level with oil level gauge.
NOTE: Never check the oil level when the engine
is running or immediately after the engine is shut
down; the reading will be inaccurate. Allow 15
minute drain down time, before checking oil level.
NOTE: If the oil level is too low, the fuel injectors
will not work correctly. If the oil level is above the
operating range, the engine has been incorrectly
serviced, fuel is in the oil, or coolant is in the oil.
3. Inspect oil for thickening.
NOTE: When the
contaminated with coolant, the oil will have a
dark-gray or black sludgy appearance.
• Engine oil level will vary depending on
temperature of engine.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
5 HARD START AND NO START DIAGNOSTICS
crankcase lube oil
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
• If oil is contaminated, see "Fuel in Lube Oil"
(page 124) or "Coolant in Lube Oil" (page 109)
in Section 4.
• If oil level is low, fill to correct level and test
again.
4. Check engine service records for correct oil grade
and viscosity for ambient operating temperatures.
Do not use 15W-40 oil below -7 °C (20 °F).
Long oil drain intervals can increase oil viscosity;
thicker oil will make engine cranking and starting
more difficult below freezing temperatures.
See "Lubrication Requirements" in the Engine
Operation and Maintenance Manual (for this
engine's model number and model year). Confirm
that oil meets correct API category.
5. Record concerns on Diagnostic Form.
Possible Causes
Low oil level
• Oil leak
• Oil consumption
• Incorrect servicing
High oil level
• Incorrect servicing
• Fuel in oil
• Coolant in oil
• Incorrect oil level gauge
Coolant in oil
• Cylinder head gasket leak
• Failed cup plug in cylinder head
• Injector sleeve leak
• Front cover gasket leak
• Front cover, cylinder head, or crankcase porosity
• Accessory leak (water cooled air compressor)
is
• Failed crevice seal (piston sleeve)
Fuel in oil
• Injector O-ring leak
• Cylinder head porosity
• Leaking injector
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