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6-12 ENGINE DIAGNOSIS (C24SE, C22NE, 22LE, 20LE) Engine Oil Consumption Excessive Condition Possible cause Correction Oil leaking Oil pan drain plug loose Retighten or replace gasket Oil pan setting bolds loosened Retighten Oil pan gasket broken Replace gasket Front cover retaining bolts loose or Retighten or replace gasket Head cover retaining bolts loose Retighten or replace gasket Oil filter adapter cracked Replace Oil filter attaching bolt loose or Retighten or replace oil filter Crankshaft front or rear oil seal Replace oil seal Oil pressure unit loose or broken Retighten or replace Blow-by gas hose broken Replace hose Engine/Transmission coupling Replace oil seal Oil leaking into combustion Valve stem oil seal defective Replace Valve stem or valve guide worn Replace valve and valve guide Oil leaking into combustion Cylinders and pistons worn Rebore cylinder and replace Piston ring gaps incorrectly Correct Piston rings set with wrong side up Correct Piston rings sticking Rebore cylinder and replace Piston ring and ring groove worn Replace pistons and others Return ports in oil rings clogged Clean piston and replace rings Crank case ventilation, Positive Positive Crankcase Ventilation Clean Others Improper oil viscosity Use oil of recommended S.A.E. Continuous high speed driving and Continuous high speed operation |