What Causes the Abnormal Noise When Shifting Gears in a Haval?
1 Answers
Haval gear shifting may produce abnormal noise due to issues with the engine or piston. Relationship between abnormal noise and engine speed: The noise only occurs at idle or low speeds. Possible causes include: excessive clearance between the piston and cylinder wall; overly tight piston pin or connecting rod bearing assembly; excessive clearance between the tappet and its guide hole; wear of the camshaft profile; sometimes, a loose starter clutch causing pulley noise (more noticeable during speed changes). Relationship between abnormal noise and temperature: Noise appears when temperature rises and diminishes or disappears when temperature drops. Possible causes include: pre-ignition due to overheating; reversed long and short axes of the piston skirt ellipse; insufficient piston ovality or too small clearance between piston and cylinder wall; piston deformation; excessively small piston ring clearance.