What are the causes of the abnormal noise in the Mercedes-Benz C-class airbag clock spring?

1 Answers
BenjaminLynn
07/30/25 4:03am
Mercedes-Benz C-class airbag clock spring abnormal noise causes are as follows: Excessive piston clearance: Piston pin installed too tightly or connecting rod bearing installed too tightly; excessive clearance between the tappet and its guide hole; wear of the cam profile; sometimes the starter pawl is loose causing the pulley to make noise (noticeable during speed changes). Disordered noise: Camshaft timing gear cracked or its fixing nut loose; crankshaft broken; piston pin bushing loose; excessive axial clearance of the camshaft or its bushing loose. Abnormal noise during rapid acceleration: The noise occurs when the engine is rapidly accelerated and persists during high-speed operation. Causes include: loose connecting rod bearing, melted or mismatched bearing shell rotating; loose crankshaft bearing or melted bearing shell; broken piston pin; broken crankshaft.
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