This specialized instrument is employed to precisely machine the contact surface within an engine’s cylinder head where the valve seals. This process ensures optimal mating between the valve and its corresponding surface. An example of its use would be resurfacing a worn or damaged area to restore proper sealing and engine performance.
Its utilization is vital for maintaining efficient combustion and reducing leakage, which directly impacts engine power, fuel economy, and emissions. Historically, these operations were performed manually, demanding considerable skill and time. The advent of more sophisticated devices has significantly improved accuracy and speed, leading to more reliable engine rebuilds.