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The pulley may slide off easily; if not, use a universal puller, which you may be able to hire.

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.

Table 14.1. Fluoroelastomers Used in Oil Aging⁵

• Fluorine rubber