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6A–15 ENGINE MECHANICAL Condition Correction Possible cause Oil leaking into combustion Valve stem oil seal defective Replace chambers due to oor seal in valve Valve stem or valve guide worn Replace valve and valve guide Oil leaking into combustion t Cylinders and pistons worn Replace cylinder body assembly and parts Piston ring gaps incorrectly Correct Piston rings set with wrong side up Correct Piston ring sticking Replace cylinder body assembly and Piston ring and ring groove worn Replace pistons and others Return ports in oil rings clogged Clean piston and replace rings Positive Crankcase Ventilation Positive Crankcase Ventilation Valve Clean Others Improper oil viscosity Use oil of recommended S.A.E. Continuous high speed driving Continuous high speed operation Fuel Consumption Excessive Condition Possible cause Correction Trouble in fuel system Mixture too rich or too lean due to Refer to “Abnormal Combustion” Fuel cut function does not work Refer to “Abnormal Combustion” Trouble in ignition system Misfiring or abnormal combustion Refer to “Hard Start” or “Abnormal Others Engine idle speed too high Reset Idle Air Control Valve Returning of accelerator control Correct Fuel system leakage Correct or replace Clutch slipping Correct Brake drag Correct Selection of transmission gear Caution operator of incorrect gear Excessive Exhaust Gas Refer to “Abnormal Combustion” |