What Causes the Water-like Noise When Accelerating?

[AlexAnn]

Noise is related to engine speed. Below is a detailed introduction to various engine speed conditions that produce abnormal sounds: Noise occurs only at idle or low speeds: Causes include: excessive clearance between piston and cylinder wall; overly tight piston pin or connecting rod bearing assembly; excessive clearance between tappet and its guide hole; wear on the camshaft profile; sometimes, a loose starter clutch causing pulley noise (noticeable during speed changes). Irregular noise at a specific speed: Brief successive sounds during rapid deceleration. Causes include: cracked camshaft timing gear or loose fastening nut; broken crankshaft; loose piston pin bushing; excessive axial clearance of camshaft or loose bushing. Noise appears during rapid acceleration: Sound persists during high-speed operation. Causes include: loose connecting rod bearings; melted or mismatched bearing shells causing rotation; loose crankshaft bearings or melted bearing shells; broken piston pin; broken crankshaft.