Valve Stem Seal

The valve stem seal is one of the valve seals of the engine.Due to emissions laws, coupled with the fact that today’s engines run hotter and valves open and close up to 100,000 times an hour, your stem seals have to be of good quality. NNK valve stem seals are made of the highest quality materials and the latest technology, ensuring tightness while extending service life and reducing replacement frequency.

Function of the valve stem seal

valve stem seals are installed in the valve guides and slide to control valve stem lubrication. Too little oil can cause stem and guide wear. Too much oil can increase oil consumption and cause carbon deposits, which can lead to valve seat damage and premature valve wear. At the same time, if the valve stem seal is damaged, it will also increase the fuel consumption.