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6A–12 ENGINE MECHANICAL (6VD1 3.2L) Engine Noisy Abnormal engine noise often consists of various noises ing parts of the engine. It is, therefore, advisable to locate Condition Possible cause Correction Noise from crank journals or from Oil clearance increased due to worn Replace crank bearings and y j bearings usually make dull noise that Crankshaft out of round Replace crank bearings and Crank bearing seized Crank bearing seized. Replace crank Troubleshooting Procedure bearing by listening for abnormal noise that stops when Condition Possible cause Correction Noise from connecting rods or from Bearing or crankshaft pin worn Replace connecting rod bearings y g connecting rod bearings usually Crankpin out of round Replace connecting rod bearings which becomes more evident when Connecting rod bent Correct or replace g ) Connecting rod bearing seized Replace connecting rod bearings Troubleshooting Procedure Condition Possible cause Correction Piston and cylinder noise k bi d h i l Piston clearance increased due to Replace piston and cylinder body makes a combined mechanical Piston seized Replace piston and cylinder body g when engine is suddenly accelerated Piston ring broken Replace piston and cylinder body but diminishes gradually as the Piston defective Replace pistons and others Troubleshooting Procedure Condition Possible cause Correction Piston pin noise Piston pin or piston pin hole worn Replace piston, piston pin and |