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.

For more information, please visit Power Steering Oil Seal.

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.

When it involves a repair, you must first remove the old oil seal. To remove an oil seal, it is important to use the right tools to avoid damaging the shaft and bore. The best solution is therefore to pull out the oil seal without having to completely dismantle the shaft. This can be done by making a few holes in the oil seal with an awl and a hammer. You can then use a hook to pull the oil seal out of its seat. You could also screw some screws into the holes and then slowly pull out the screws to extract the oil seal from its housing. Be careful not to damage the shaft or housing in the process.

If the shaft or housing gets damaged, it must be repaired. If you replace only the oil seal, but the shaft or bore remain damaged, then there is a chance of premature failure or leakage. You can easily repair the shaft, for example using an SKF Speedi-Sleeve.

If you want to learn more, please visit our website china motor seal manufacturer.