NILO AUTO INDUSTRIES seats are specifically developed to resist wear at high temperatures. The valve oil sealing materials are based on high-speed steel and contain wear-resistant carbides that are thermally stable at exhaust valve seat operating temperature.
As valve guides wear, their ability to positively locate the valve to the valve seat decreases. As the valves lose their ability to seal the combustion chamber properly, the engine can lose performance and start to burn oil, leaking from the top of the cylinder head into the intake and exhaust manifolds. Modern engines are fitted with valve stem oil seals which can be replaced if oil leakage occurs.