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Engine Mechanical – V6 Page 6A1–37
2.13 Coolant in Combustion Chamber Definition Excessive white smoke and/or coolant type odour emitted from the exhaust pipe may indicate coolant in the combustion 1 Remove the spark plugs and inspect for spark plugs saturated by coolant and coolant in the cylinder bore. 2 Inspect by performing a cylinder leakage test, refer to 2.16 Cylinder Leakage Test. During this test, excessive air bubbles in the coolant may indicate a faulty head gasket, cracked cylinder head or cracked cylinder 3 Inspect by performing a cylinder compression test. Two cylinders side-by-side on the cylinder block, with low Engine Compression Test. Cause Correction Cracked intake manifold or faulty gasket. Replace components as required, refer to 3.10 Intake Manifold Assembly – Complete. Faulty cylinder head gasket. Replace the cylinder head gasket, refer to 3.22 Cylinder Head Assembly. Warped cylinder head. Repair or replace the cylinder heads as required, refer to Cylinder Head Assembly. Cracked cylinder liner or block Repair or replace the cylinder block and components as Cylinder Block. Cylinder head or cylinder block porosity. Repair or replace the cylinder block or cylinder heads as Cylinder Block or 3.22
Cylinder Head Assembly. 2.14 Coolant in Engine Oil Definition Foamy or discoloured oil or an engine oil overfill condition may indicate coolant entering the engine crankcase. Low 1 Inspect the oil for excessive foaming or an overfill condition. Oil diluted by coolant may not correctly lubricate the 2 Perform a cylinder leakage test, refer to 2.16 Cylinder Leakage Test. During this procedure, excessive air bubbles in the engine coolant may indicate a faulty gasket or damaged component. 3 Perform a cylinder compression test. Two cylinders side-by-side on the cylinder block, with low compression, may Engine Compression Test. Cause Correction Faulty cylinder head gasket. Replace the cylinder head gasket, refer to 3.22 Cylinder Head Assembly. Warped cylinder head. Repair or replace the cylinder heads as required, refer to Cylinder Head Assembly. Cracked cylinder liner or block Repair or replace the cylinder block and components as Cylinder Block. Cylinder head, cylinder block or intake manifold porosity. Repair or replace the cylinder block, cylinder heads or Cylinder Block, 3.22 Cylinder Head Assembly or 3.10 Intake Manifold Assembly – Complete. |