Leather Seals v Modern Replacements

I am sometimes asked whether a modern seal should be used where the original seal was metal/leather.

A modern seal can be used but only if the shaft the seal is sealing to has a suitable surface finish. If for example the shaft is a new axle shaft this will probably be OK. If the shaft has any imperfections a leather seal will usually seal better as the lip of a leather seal is wider than a modern neoprene seal. If the shaft is made of a soft material a modern seal can wear a groove in the surface for the same reason.

Preparation of leather seals

Before fitment of leather seals a little preparation will help get the best results.

1. If there is any corrosion or light rust on the metal casing of the seal this should be removed with fine emery cloth or wire wool.
2. If the leather is coated in a protective coating of grease this should be removed with white spirit.
3. Soak the seal for at least 24hours in oil in a warm place.
4. Drain excess oil from the seal before fitment.

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