Which Way Do I Install The Oil Seal?

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We receive this question quite regularly: Which way do I install this oil seal?

The above picture shows the cross section of a single lipped oil seal. The side with the spring and recess always faces the oil you are trying to contain.

IE:

Crank seals on the drive side or primary side are meant to retain the oil level in the chain case. The seal is installed with the spring facing out toward the primary case. The seal actually rides on the engine sprocket shoulder. Removed for photography.

Seals in the timing cover are retaining oil pressure in the cover. An example of this is the timing side crank oil feed seal. The points seal is meant to keep oil away from the contact breaker so it is installed reverse of the feed seal.

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Gearbox seals retain gear oil so to spring goes towards the inside of the gearbox.

Magneto seals keep oil out of the mag and in engine case to which they are mounted.

I have never seen a seal fitted otherwise than with the garter spring and lip facing toward the oil or grease in the bearing. (But I have never worked on ag equipment) But if the workshop manual for your machine says otherwise, follow that.

That includes double lip seals, which usually face the same way as a single lip seal.

Normally it is not recommended to pump a bearing so full of grease that it comes out the seal. The recommendation is they need air space inside the bearing for the grease to flow around in there. One or two squirts a year should be enough. If it is packed full the grease can overheat and deteriorate. Again, if the factory workshop manual or owners manual says otherwise, follow that.

If the machine is so old that it came with leather seals, which always puked eveywhere, then it probably had instructions to keep up the grease supply regularly. But if replacing the leather with modern double lip seals you probably don't need to top up the grease regularly. Like wheel bearings in a car, they pretty much will run for life without fresh grease as long as none is leaking out.

Edited By Hopper on 02/03/ 02:35:00

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