What should be removed from a valve after it has been serviced?

When a valve has been serviced, it is essential to remove carbon deposits. During operation, valves can accumulate built-up carbon from the combustion process, especially in engines that operate on fossil fuels. These deposits can lead to poor sealing, affecting the performance of the valve and the overall efficiency of the engine.

Removing carbon deposits is crucial because if they are left in place, they can interfere with the proper functioning of the valve, potentially causing issues such as leaking, sticking, or poor sealing. This can lead to performance issues, increased emissions, and potential engine damage over time.

While oil residue, rust, and valve seal material are also important to address during maintenance, the specific concern of carbon deposits relates directly to the valve's operational integrity and efficiency. Ensuring a clean surface free of carbon deposits helps maintain optimal valve performance and prolong the life of the engine.