SKF
Engine Seals (Automotive)
SKF engine seals encompass the dynamic and static sealing components that manage oil, coolant, and combustion gases within the modern internal combustion engine. The range includes engine shaft seals (crankshaft front and rear seals), magnetic trigger wheels (integrated into rear main seals), and valve stem seals. These seals operate under extreme conditions: high shaft speeds, wide temperature fluctuations, aggressive engine oils (including low-viscosity synthetics), and exposure to combustion by-products. SKF engine seals use premium materials — FKM, PTFE, ACM — and advanced lip geometries to provide long-life, low-friction sealing. The engine shaft seals are often designed as cassette modules with integrated wear sleeves and dust lips. Reliable engine sealing prevents oil leaks that can damage auxiliary components, cause emissions non-compliance, and lead to engine damage from oil starvation. SKF partners with engine manufacturers to integrate seals into the engine design from the early development phase.
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Crankshaft Seal Cassette Modules
Fully integrated seal, sleeve, and dust lip; simple assembly.
PTFE Lip Technology
Low friction, dry-run capable, and resistant to modern oils.
Magnetic Trigger Wheel Integration
Rear main seals with integrated encoder for engine timing.
High-Temperature Elastomers
FKM and ACM withstand turbocharger heat and long-drain oils.
Valve Stem Oil Control
Precise metering lip profiles optimise oil consumption and emissions.
Reduced Parasitic Loss
Low-friction seal lips contribute to fuel economy and CO2 reduction.
Engine Shaft Seals: Front and Rear Crankshaft Sealing
The front crankshaft seal retains oil behind the harmonic balancer, enduring belt loads and dust. The rear main seal (RMS) is the largest engine seal, often a PTFE or FKM cassette module, sealing the crankshaft exit at the flywheel. SKF's rear main seals with integrated wear sleeve also often carry the magnetic target wheel for the crankshaft position sensor, providing a critical timing signal for engine management.
Valve Stem Seals: Controlling Oil Consumption and Emissions
Valve stem seals meter a small amount of oil to lubricate the valve guide while preventing excess oil from entering the combustion chamber. SKF's precisely designed lip geometry and high-temperature FKM materials maintain this delicate balance for hundreds of thousands of kilometres, directly influencing oil consumption, emissions (HC and particulate), and catalytic converter life.