THE DIFFERENCE BETWEEN MECHANICAL SEAL AND OIL SEAL
- The Half Moon Valve Cover Gasket, named for its distinctive crescent shape that fits snugly around the perimeter of the valve cover, serves as a seal between the cylinder head and the valve cover. Its design, though simple, is engineered to withstand high temperatures and pressures within the combustion chamber, preventing oil leaks and ensuring efficient lubrication of the valvetrain.
An oil seal, also known as crankshaft retainer, is a small device, but essential to ensure the proper engine operation. It plays a key role in all moving parts of an engine, acting as a physical barrier. This mechanical seal fulfils the dual purpose of sealing a rotary shaft to maintain the necessary lubrication (avoiding leaks) and preventing other foreign matter from contaminating shafts and bearings in the rotary shaft equipment.
Hydrogenated nitrile natural rubber (HNBR)


The oil seal is our first line of defense in regards to keeping lubrication inside the reducer. It might also be described as the last line of defense – keeping contaminants outside the reducer where they belong. The average seal is incredibly simple in design – made up of a case, a lip or lips, and frequently a garter spring. Of course, some are exponentially more intricate and are manufactured with unusual materials, but the majority are straightforward.
Oil seal material
Valve Cover Gasket for Sale: Ensuring Engine Integrity and Performance


Factors in Oil Seal Selection


Figure 6: Oil seals for cars
HID (High Intensity Discharge)
Some disadvantages of NBR are poor ozone, sunlight and weather resistance as well as limited high temperature and flame resistance. For higher temperature resistance, a much better material to use is Silicone.