Home » International DT466 » International DT466 – ENGINE SYMPTOMS DIAGNOSTICS – Coolant in Lube Oil

International DT466 – ENGINE SYMPTOMS DIAGNOSTICS – Coolant in Lube Oil

Symptom

When the crankcase lube oil is contaminated with coolant, the oil will have a dark-gray or black sludgy
appearance. The crankcase may also be overfilled.

Cause
• Accessory leak (water cooled air compressor)
• Injector sleeve leak
• Cylinder head cup plug failure
• Crevice seal (liner O-ring)
• Cylinder head gasket leak
• Front cover gasket damage
• Front cover, cylinder head or crankcase porosity

Tools
• Radiator pressure testing kit
• Plastic surge tank cap adapter
• Cylinder head test plate
• Water supply housing pressure adapter
• Thermostat opening pressure adapter (cylinder head)
• Straightedge
• Feeler gauge