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A valve shim is a small but important component in a combustion engine. It sits around the valve stem (the long, narrow part of the valve) and ensures that no or very little oil from the cylinder head enters the combustion chamber via the valve stem. The valve shim prevents excess oil from entering the combustion chamber via the valve stem. It allows just enough oil to pass through for lubrication, so that the valve can move smoothly, but prevents oil leakage and smoke formation. Valve stem seals are usually made of a combination of rubber (for flexibility and sealing) and a metal sleeve (for strength and clamping force). They are susceptible to wear, especially at high mileage or when using cheap oil or poor lubrication. |
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