Coolant In Engine Oil - Chevrolet 5.7L Corvette 2004 Shop Manual

DEFINITION: Excessive white smoke and/or coolant type odor coming from the exhaust pipe may
indicate coolant in the combustion chamber. Low coolant levels, an inoperative cooling fan, or a faulty
thermostat may lead to an "overtemperature" condition which may cause engine component damage.
1. A slower than normal cranking speed may indicate coolant entering the combustion chamber.
Refer to Engine Will Not Crank - Crankshaft Will Not Rotate .
2. Remove the spark plugs and inspect for spark plugs saturated by coolant or coolant in the cylinder
bore.
3. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the
coolant may indicate a faulty gasket or damaged component.
4. 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 .
Cracked intake Replace the components as required.
manifold or failed
gasket
Faulty cylinder head Replace the head gasket and components as required. Refer to Cylinder Head
gasket Cleaning and Inspection , Cylinder Head Replacement - Left and Cylinder
Head Replacement - Right .
Warped cylinder head Machine the cylinder head to the proper flatness, if applicable and replace the
cylinder head gasket. Refer to Cylinder Head Cleaning and Inspection .
Cracked cylinder Replace the cylinder head and gasket.
head
Cracked cylinder Replace the components as required.
liner or engine block
Cylinder head or Replace the components as required.
engine block porosity

COOLANT IN ENGINE OIL

Coolant in Engine Oil
Cause
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.
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 .
2. Inspect by performing a cylinder leak-down test. During this test, excessive air bubbles within the
cooling system may indicate a faulty gasket or damaged component.
3. 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
Correction