Oil seal type or shape
To ensure correct fit and proper protection against contaminants, the inside diameter of an oil seal must be slightly smaller than the shaft diameter.
Figure 7: Oil seals for steel production equipment (rolling mill)
Metal O.D. wall type Ensures improved fitting retention between the seal O.D. and the housing bore.
Set the gasket on the block and make sure that all holes are perfectly aligned before refitting the head (See How to remove a cylinder head ).
Conventional oil seals are the traditional seals, which can be recognised by a spring on the inside. These oil seals are made of a metal housing that contains a rubber seal. This part is often made of elastomer and comes into contact with the surface of the rotating shaft.



car engine oil seal. Additionally, oil leaks can also damage other engine components, such as the timing belt or spark plugs, leading to further costly repairs.