Valve Stem Seals

Valve Stem Seals

Valve Stem Seals

Valve stem seals are devices that provide a defined metering rate of oil to the valve stem interface of internal combustion engines to lubricate the valve guide and minimize engine missions which provide a controlled leak of oil to allow the valve stem to be lubricated as it slides in the valve guide.

The amount of oil that passes by the valve stem seal must be precisely controlled, as too little oil causes stem and guides wear.

Too much oil causes carbon buildup leading to valve seat damage, decrease in volumetric efficiency, increased emissions and excessive oil consumption.