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What Factors May Cause A Leaking Oil Seal

Automobiles rely on rotating parts to transfer engine momentum to the wheels via the transmission. These components are made of materials such as hardened steel, cast iron, aluminium or other such alloys.

However, oil seals are necessary so that engine oil and transmission oil remain in foreign bodies outside the transmission system. Oil seals perform sealing applications in gearboxes and prevent leakage of non-pressure fluids and grease. Oil seals are usually low cost, but if they are to be replaced they can be costly in terms of labour. Here we look at what are some of the common causes of oil seal leaks.

 

Driveline problems

If the driveshaft or drive axle is damaged, the transmission seals will start to leak. When a driveshaft or drive axle is damaged, bent or loose, the shaft will experience excessive vibration and uneven shaft wear. Defective U-joints or rear wheel drive vehicles can cause this to happen.


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Seals become dry

Oil seals are usually made of natural or synthetic rubber compounds. If they are left unused for a long time, they can dry out. As a result, the seal shaft interface may be lost, exposing the metal surface to oxidation. A rusty shaft can break the seal and therefore in this case the seal will be damaged when driving the car. Similarly, unused seals may develop dry spots due to weathering and cracking.

 

Aging seals

As a seal ages, it tends to move away from the surface they tend to mate with. This effect can lead to excessive space between the seal and the shaft. It provides space for oil to escape.

 

Harsh driving conditions

Adverse weather conditions such as severe cold weather can cause seals to break and lead to seal failure - similarly, vehicles on the road can encounter adverse conditions such as rocks, thick dust and temperature changes.

As a result, dirt can build up in the gap between the shaft and the seal. This can be seen usually on construction machinary oil seals. When this happens, the oil starts to leak.

 

Improper maintenance

Running the engine continuously for a long period of time can make the seal too hot or possibly dry it out, which can cause it to wind up and start leaking. Again, driving with an overheated engine may produce the same result. In addition, adding too much fluid can cause seals to 'burst', especially in gearboxes.

Seals are fragile and can easily be damaged by a clumsy mechanic. Therefore, when carrying out any maintenance activities, make sure that the seals are free from dust or burrs.


styles of oil seals


KDIK OIL SEAL provides a wide range of sealing solutions to meet the various needs of automotive manufacturing. Our seals can be installed in systems of commercial cars, buses, trucks, and motorcycles. Please feel free to contact us.