The valve stem seal is an essential component that controls the amount of lubricant oil that goes into the valve stem. The seal maintains the stem and valve guide lubricated to lessen friction.
Valve stem oil seal functionThe valve stem seal regulates the amount of oil that is used to lubricate the engine by letting a certain amount of oil inside the valve stem. It is better to have a controlled amount of oil because it helps provide sufficient lubrication to various components. Since low amounts of oil can cause friction and the component will wear out faster, while too much oil can lead to carbon buildup.
Common issues with a worn-out valve stem sealA worn-out valve stem seal can lead to an increase in engine emission, friction, and poor fuel efficiency.