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Coolant in Combustion Chamber

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Coolant in Combustion Chamber

Cause Correction
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 Leakage 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 .
Faulty cylinder head gasket Replace the head gasket and components as required. Refer to Cylinder Head Cleaning and Inspection and Cylinder Head Replacement - Left Side and/or Cylinder Head Replacement - Right Side .
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 head Replace the cylinder head and gasket. Refer to Cylinder Head Replacement - Left Side and/or Cylinder Head Replacement - Right Side .
Cracked cylinder liner or engine block Replace the engine. Refer to Engine Replacement .
Cylinder head or engine block porosity Replace the cylinder head(s) or engine. Refer to Cylinder Head Replacement - Left Side and/or Cylinder Head Replacement - Right Side or Engine Replacement .
Water outlet housing crack or porosity Inspect the water outlet housing. Refer to Water Outlet Housing Removal , Water Outlet Housing Cleaning and Inspection and Water Outlet Housing Installation . Replace the component as required.
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