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What causes the rattling sound in the engine?

1 Answers

MacIsabella

07/29/25 5:48pm

Engine rattling sound depends on the engine's speed state. The following are the causes of abnormal sounds: 1. The abnormal sound only occurs during idle or low-speed operation. Possible causes include: excessive clearance between the piston and cylinder wall; overly tight piston pin assembly or overly tight connecting rod bearing assembly; excessive clearance between the tappet and its guide hole; wear on the camshaft profile; sometimes, a loose starter causing pulley noise (more noticeable during speed changes). 2. The sound becomes chaotic when maintaining a certain speed, and short sounds are emitted successively during rapid deceleration. Possible causes include: cracked camshaft timing gear or loose fixing nut; broken crankshaft; loose piston pin bushing; excessive axial clearance of the camshaft or loose bushing. 3. The abnormal sound appears during rapid acceleration of the engine and persists during high-speed operation. Possible causes include: loose connecting rod bearing, melted or mismatched bearing shell causing rotation; loose crankshaft bearing or melted bearing shell; broken piston pin; broken crankshaft.

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