The valve guide is a round-like metal pressed into the cylinder and with the valve moving back and forth.
Valve guide functionThe valve guide also works to transmit heat from the combustion process out of the exhaust valve. Once it comes out from the exhaust valve and into the cylinder head, it can be taken up by the cooling system. The space between the inner diameter and the valve stem's outer diameter is vital for the engine's performance. It also offers good service life with the use of bronze as well as steel.
Common problems with a worn valve guideA worn valve guide can lead to the valves losing the ability to seal the combustion chamber and cause leaking and a decline in engine performance.