Piston wash is a term used to describe the appearance of the top of a piston in an internal combustion engine. It can be used to assess the engine’s performance and identify potential problems.
The importance of checking piston wash lies in its ability to provide valuable insights into the engine’s combustion process. By examining the pattern and color of the deposits on the piston’s surface, mechanics can determine whether the engine is running too lean or too rich, identify ignition timing issues, and detect signs of excessive wear or damage.