- The valve cover gasket is a seal placed between the valve cover and the engine cylinder head. Its primary function is to prevent oil from entering the spark plug wells while containing pressure within the engine. A 4.0 valve cover gasket refers to a specific type or model designed for engines with a particular configuration or size, suggesting it is tailored for optimal performance in such systems.
Auto gaskets are crucial components in vehicle systems, serving to create a secure seal between mating surfaces to prevent fluid or gas leakage. These gaskets are used in various automotive applications, including engines, transmissions, and exhaust systems. High-quality auto gaskets are essential for maintaining the integrity and efficiency of vehicle systems, contributing to optimal performance and reliability.

spark plug axia.
Purpose of oil seal

oil seal 45 62 8.
Silicone Oil Seals - Designed to absorb lubricants in order to lessen wear and friction, silicone rotary shafts also offer high thermal resistance and a large temperature range. But, they do not handle abrasions well or interact with oxidized oils.
A patent for an oil seal was filed by Nelson Thomas Edward on August 12, 1937, and published a year later. There were two purposes described. The device was to provide an oil seal between a fixed housing and a rotating part. The seal is described as
Insert a tyre lever or large screwdriver into the starter aperture so that it jams in the teeth of the ring gear on the flywheel .
Rotary Wheel Of Auto Parts
(visible lead marks)
Propylene (fluorinated ethylene)


Sealing principle: Since there is an oil film controlled by the oil seal edge between the oil seal and the shaft, the oil film has fluid lubrication characteristics.

rubber edge gasket.

rubber tube gasket. This is especially important in environments with high levels of mechanical stress or movement, where a rigid gasket may fail to provide adequate protection.
