- Oil or other seals can be used for grease and oil seals. A flexible lip, radial lip, or rotating shaft seal are different names for an oil seal. Single lip, double lip, triple lip, and four or more lips are frequent configurations. Double dust lip seal A seal with a garter spring design is the Double Dust Lip (DDL) seal. It has two dust lips, as the name would imply, plus a fluid lip with a garter spring to keep the lip firmly attached to the wear ring. Given the ongoing evolution of bearing seal designs, this seal would be considered a starting seal. For more than 50 years, this design has been the workhorse of the freight business; it still is in some regions. NBC Brenco Bearing Seal performs the fundamental task of keeping contaminants and grease out. Because of the garter spring, this seal would add the most torque and temperature to the bearing. Efficiency plus bearing seals Due to eliminating the fluid lip using poly inserts and rotors, the Efficiency Plus (EP) seal has a reduced torque value of fewer than 15 in-lbs. Although it features a triple dust lip rather than a double dust lip, the dust lip is still a molded component of the design. A labyrinth-like insert and rotor interlock each other to replace the fluid lip. NBC Brenco labyrinth provides excellent grease while lowering the torque required to rotate the seal. Other types of oil seal and grease seals include:
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- Types of High Temperature Rubber Gaskets
- The head gasket, as its name suggests, sits between the engine block and cylinder head, serving as a seal that prevents the mixing of coolant, oil, and combustion gases. It's a critical barrier, maintaining the integrity of the engine's cooling and lubrication systems while also facilitating compression within the cylinders.
- Valve cover gaskets are typically made of rubber or composite materials, which provide flexibility and durability. They are designed to withstand high temperatures and pressures generated by the engine. Over time, however, these gaskets can become hardened, cracked, or worn due to exposure to extreme conditions. When this happens, they need to be replaced to prevent further damage to the engine.
- PTFE Oil Seals – Are a relatively new oil seal, the use of polytetrafluoroethylene means they can withstand dry and unlubricated operations. They have a massive thermal range spanning from -130°C to more than 200°C and a strong resistance to chemicals, they are the future of rotary shaft seals.
④ Types of Oil Seals in Application
They are generally utilised for the following purposes:
- The efficiency of an ignition spark plug is measured by its ability to produce a consistent, powerful spark under various engine conditions. Factors such as heat range, thread size, and spark gap all influence its performance. A spark plug that's too cold may not ignite the fuel efficiently, leading to engine misfires, while one that's too hot can cause pre-ignition or detonation, potentially damaging the engine.
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- PTFE Oil Seals – Are a relatively new oil seal, the use of polytetrafluoroethylene means they can withstand dry and unlubricated operations. They have a massive thermal range spanning from -130°C to more than 200°C and a strong resistance to chemicals, they are the future of rotary shaft seals.
- Heat resistance
- In addition to its practical benefits, the National Skeleton TC Oil Seal is also easy to install and replace, making it a cost-effective solution for businesses looking to keep their machinery running smoothly. Regularly checking and replacing oil seals can help prevent costly breakdowns and downtime, saving time and money in the long run.
Valve Cover Gasket: Role in Engine Functionality
3) Seal numbering system
Aspects to consider when selecting oil seals


7. Selecting high-quality oil seals
Elring supplies liquid sealants, head gaskets and also oil seals. The extensive range almost always offers a solution for an engine block and quality is can’t be missed in Elring's product range.
What are Oil Seals and the different types?
④ Dimensional numbers Shaft number 45: The seal suits the shaft diameter of ϕ45 mm. Housing bore number 70: The seal suits the housing bore diameter of ϕ70 mm. Width number 8: The seal width is 8 mm. ⑤ Special shape code
The sealing lip of the RST-D is more heavy-duty, so it can cope with pressures of up to 10 bar at slightly lower rotation speeds.
Seals are designed to create a tight seal around the shaft by utilising a combination of lip geometry, surface tension, and lubrication. When the shaft rotates, the lip of the oil seal comes into contact with the shaft surface, creating a frictional force that generates heat. This heat helps to soften and conform the elastomeric material of the oil seal to the shape of the shaft, ensuring an effective sealing action.