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Leakage from the mating part
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Current location：Home > Products and Services > Oil Seal Technical Information > Key Points To Check When Oil Seal Leaks > Leakage from the mating part

Oil Seal Technical Information
Check points Leaking from lips Leakage from the mating part
Main Reason Failure Mode Reason Countermeasures
Oil seal tilted installation [Before removing the oil seal] Visual inspection shows that the oil seal is tilted relative to the cavity and shaft. [After removing the oil seal] The contact of the oil seal mating part is uneven.

· The inner diameter of the cavity hole is smaller than the specified size, and it has never been fine-machined. The oil seal is barely driven in, and the oil seal is installed at an angle.

· The cavity is not chamfered, it is not suitable, the oil seal is barely driven in, and the oil seal is installed at an angle.

· The assembly fixture is tilted, so it is installed at an angle.

· Use the specified cavity hole inner diameter size.

· Chamfer the cavity hole surface to the appropriate size.

· Improve the assembly fixture.
Deformation of oil seal Deformation of oil seal There is a partial interruption in the traces of matching

· Due to incorrect assembly of the oil seal fixture, the oil seal is deformed.

· Due to local deformation during use, the oil seal is installed and a gap occurs in the mating part.

·Improve the assembly jig.

·Be careful not to drop or hit hard objects when using.
The oil seal mating part is squeezed or stuck [After the oil seal is removed] There is "damage" or "squeezing" of the rubber in the axial direction of the oil seal mating part.

·The inner diameter of the cavity hole is smaller than the specified size, and it has never been finely processed. The oil seal is forced into it, and the oil seal is installed at an angle, which eventually causes damage to the fitting part.

·The cavity is not chamfered, which is not suitable. The oil seal is forced into it, and the outer periphery of the oil seal is damaged.

·When the oil seal is installed in a state where the parallelism between the oil seal assembly fixture and the cavity is not achieved, the fitting part of the oil seal is "squeezed".

·Use the specified cavity hole inner diameter size.

·Chamfer the cavity hole surface to the appropriate size.

·Make the parallelism between the oil seal assembly fixture and the cavity meet the requirements.
Oil seal is normal The lip end is heavily worn, with circumferential "stripes" on the wear surface.

· When installing the oil seal, foreign matter such as swarf powder adheres to the inner surface of the cavity hole and the oil seal mating part, causing "damage" to the inner surface of the cavity hole.
· After several assembly and disassembly of the oil seal, the inner surface of the cavity hole is "damaged".
· There is a large pit on the inner surface of the cavity hole.

· Because the "burrs" on the chamfered part of the cavity hole surface were not removed, "damage" occurred on the inner surface of the cavity hole when the oil seal was installed.

· The inner surface of the cavity hole is too rough.

·Apply a thin layer of liquid sealant to fill the "damage" and pits on the inner surface of the cavity hole. But be careful not to let the liquid sealant adhere to the lip of the oil seal and the shaft.

·When disassembling the oil seal, check whether there are "burrs" on the chamfer of the cavity hole. If there are burrs, remove them with emery paper and apply liquid sealant to the inner surface of the cavity hole.

·Emergency treatment: Apply liquid sealant to the inner surface of the cavity hole.
·Permanent countermeasures: Make the inner surface of the cavity hole rough.