Cause
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Correction
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DEFINITION: Foamy or discolored oil or an engine oil "overfill"
condition may indicate coolant entering the engine crankcase. Low
coolant levels, an inoperative cooling fan, or a faulty thermostat
may lead to an "overtemperature" condition which may cause engine
component damage. Contaminated engine oil and oil filter should be
changed.
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1. |
Inspect the oil for excessive foaming or an
overfill condition. Oil diluted by coolant may not properly
lubricate the crankshaft bearings and may lead to component damage.
Refer to .
Lower Engine Noise, Regardless of Engine Speed |
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2. |
Inspect by performing a cylinder compression test.
Two cylinders "side-by-side" on the engine block with low
compression may indicate a failed cylinder head gasket. Refer to .
Engine Compression Test |
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Faulty external engine oil cooler
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Replace the components as required.
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Faulty cylinder head gasket
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Replace the head gasket and components as required. Refer to
Cylinder Head Cleaning and Inspection and
Cylinder Head Replacement .
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Warped cylinder head
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Replace the cylinder head. Refer to
Cylinder Head Replacement .
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Cracked cylinder head
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Replace the cylinder head and gasket. Refer to
Cylinder Head Replacement .
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Cracked cylinder liner or engine block
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Replace the components as required.
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Cylinder head, block, or manifold porosity
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Replace the components as required.
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