What should be verified when cleaning the cylinder head after lapping valves?

When cleaning the cylinder head after lapping valves, it is crucial to remove all traces of grinding compound. The grinding compound is an abrasive material that is used to create a proper seal between the valve and the seat. If any remnants of this compound are left on the surfaces, they can cause excessive wear during operation and potentially damage the valve and cylinder head over time.

The presence of grinding compound can lead to poor performance, improper sealing, or even catastrophic engine failure if particles circulate within the engine. This is why thorough cleaning is important; it ensures that the mating surfaces are free from any materials that could interfere with the engine’s operation.

Using only water or relying on electric cleaning devices may not guarantee that all the abrasive material is completely removed. Maintaining the integrity and longevity of the engine requires meticulous attention to detail in the cleaning process, making sure that nothing is left that could cause issues once the engine is reassembled and run.