Why does the Volkswagen CC make noise when accelerating?
1 Answers
There are several reasons why a Volkswagen CC may produce noise when accelerating, including loose fasteners, deformation or damage of certain components, improper assembly adjustment or repair, and excessive clearance between parts. Loose fasteners: Vibration during engine operation can cause certain parts to become loose, resulting in impact sounds. For example, loose flywheel mounting bolts or connecting rod bolts can cause abnormal noises. Deformation or damage of certain components: Abnormal noises can be caused by deformation or damage of certain parts. For example, a bent connecting rod can lead to piston slap, and broken valve springs or a fractured crankshaft can also cause unusual sounds. Improper assembly adjustment or repair: Incorrect assembly adjustment or repair can lead to improper clearance between components. For instance, overly tight piston pin assembly or improperly adjusted valve clearance can result in abnormal noises. Excessive clearance between parts: Clearance between parts is an important indicator of automotive assembly quality. When lubrication, temperature, load, and speed are constant, abnormal noises become more pronounced as the clearance increases. Natural wear of certain moving engine components can cause the clearance to exceed the acceptable range, leading to noises such as piston slap against the cylinder wall or impact sounds between connecting rod bearings and journal.