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First, an elastomer, most often nitrile, is vulcanised to a metal ring. This creates a stiffening effect that includes a specialised metal tension spring directly behind the sealing lip, keeping the oil seal firmly in place against the moving part.
Take extra care with a light alloy block or head. It is vital to avoid scratching the machined surface.

Oil seals normally consist of three basic components: the sealing element, the metal case, and garter spring.
(visible lead marks)
2. PRESSURE: Oil Seals cannot endure a lot of pressure. You need to understand your machinery’s pressure capabilities and ensure you use the correct seal to withstand its pressure levels.

steering oil seal.
How does an Oil Seal Work
Automotive Rubber Gaskets: Versatile Sealing Solutions

