Lube Oil In Coolant - Navistar International DT 466 Diagnostic/Troubleshooting Manual

122

Lube Oil in Coolant

Symptom
Coolant contaminated with lube oil will have oil in the
deaeration tank.
Cause
• Oil cooler
Tools
• Oil cooler pressure test plate
• Air pressure regulator
Procedure
Figure 139 Deaeration tank fill position
1. Deaeration tank cap
2. Deaeration tank
3. MAXIMUM coolant level mark
4. ADD coolant level mark
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
4 ENGINE SYMPTOMS DIAGNOSTICS
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
WARNING: To avoid serious personal injury,
possible death and damage to the engine:
• Always allow the engine to cool for 15
minutes.
• Wrap a thick cloth around the cap.
• Loosen cap slowly a quarter to half turn.
• Pause for a moment to avoid water or steam
scalding.
• Continue to turn the cap and remove.
• Never add cold coolant to a hot engine. This
can result in a cracked cylinder head or
crankcase.
• Never use water as a coolant substitute.
1. Verify if coolant is contaminated by inspecting
deaeration tank for presence of oil.
2. Place a coolant drain pan under the oil system
module.
Figure 140 Coolant drain plug
3. Remove the coolant drain plug located at the
bottom of the oil system module. Drain coolant
NOTE: Replace O-ring with a new O-ring when
installing the coolant drain plug.