What to Do About Slight Engine Piston Slap?

[VanElizabeth]

Solutions for slight engine piston slap: 1. If the piston slap sound persists and becomes more noticeable after the engine reaches normal operating temperature, the owner should avoid high-speed operation and conduct a parking inspection to prevent more severe malfunctions; 2. Remove the cylinder head and extract the piston. If severe cylinder out-of-roundness or scoring is observed, replace the piston. If excessive clearance between the piston and cylinder is detected, consider replacing the cylinder liner or piston rings. Engine piston slap refers to the abnormal knocking or tapping sound produced when the piston oscillates within the cylinder during the initial moment of the power stroke or upward movement, causing its head and skirt to collide with the cylinder walls.