Piston slap refers to the knocking or tapping sound coming from the engine compartment. Piston slap is a commonly encountered issue in internal combustion engines that can lead to unwanted noise, reduced performance, and potential long-term damage if left unaddressed.
It is the knocking or rattling noise produced when the piston moves inside the cylinder bore. This happens due to excessive clearance between the piston and the cylinder walls. The engine piston wants to move frequently inside the cylinder bore. The lubrication inside the cylinder bore helps to move it freely inside. If there is any problem that happens inside it will cause noise.
Piston slap is generally caused when the cold running clearance (piston-to-wall clearance) is large enough that when the piston rocks from side to side in the bore it “slaps” the side of the cylinder and causes noise.
Various factors can contribute to the development of piston slaps in an engine:
- Worn engine walls
- Improper piston design
- Incorrect piston installment
- Improper Lubrication
- Worn piston rings.
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