Lapped Side Housings

People often ask us on our opinion of lapped side housings.

Side housings have a nitrided surface, which is a heat treating process that diffuses nitrogen into the surface of a metal to create a case hardened surface.

When you lap a side housing you remove this nitrided surface.

We do not offer this service nor do we condone it.

When this nitrided surface is removed excessive wear can occur when using any seal that comes into contact with the side housing, including Mazda corner seals and Atkins Solid Corner Seals.

It can also cause excessive wear to the side seals and oil rings when they come into contact with raw side housings with no nitrided surface.