SKF
Valve Stem Seals
SKF valve stem seals are small, high-precision lip seals fitted over the valve guide and against the valve stem in the engine cylinder head. Their function is to allow a controlled amount of oil to pass to lubricate the valve guide while preventing excessive oil from being drawn into the combustion chamber during the intake stroke, which causes hydrocarbon emissions, oil consumption, and spark plug fouling. SKF valve stem seals are produced in FKM or ACM elastomers with a precisely moulded sealing lip, often backed by a garter spring for consistent radial force. The seal must withstand the hot, oil-drenched environment of the cylinder head, rapid valve reciprocation, and modern synthetic engine oils. SKF’s designs incorporate features to improve installation security on the guide and maintain oil metering accuracy over the engine’s life.
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Pre‑cise Oil Metering Lip
Allows a controlled oil flow for valve guide lubrication, prevents excess.
High‑Temperature FKM Material
Withstands cylinder head temperatures near the exhaust valves.
Garter Spring‑Energised
Maintains consistent lip tension around the stem.
Multiple Lip Profiles
Single and double‑lip designs for intake and exhaust applications.
Snap‑On or Press‑Fit Retention
Secure on the valve guide.
Reduced Hydrocarbon Emissions
Minimises oil burning in the combustion chamber.
Why Valve Stem Seals Influence Emissions Compliance
Every drop of oil that leaks past the valve stem seal is burned in the combustion chamber, increasing hydrocarbon and particulate emissions. Over a vehicle’s 150,000‑mile life, a poor‑quality seal can contribute to cumulative oil consumption that causes the vehicle to fail emissions tests. SKF’s precision‑metering lip profile helps automakers meet stringent tailpipe regulations.
Replacing Valve Stem Seals Without Removing the Cylinder Head
Specialised tools allow the valve springs to be compressed and the old seal pried off, and the new SKF seal pressed onto the guide, all with the cylinder head in place. This is a common high‑mileage service to cure oil smoke on start‑up without a full engine rebuild.