- Valve cover gaskets play a crucial role in the operation of an engine. These gaskets are designed to seal the gap between the valve cover and the cylinder head, preventing oil from leaking out and dirt from getting in. If the valve cover gaskets are worn out or damaged, it can lead to oil leaks, which can cause damage to the engine and decrease its performance.
- Understanding these percentages is critical for engineers and technicians when selecting the right oil seal for a specific application. The balance between rubber, metal, and fillers determines the seal's ability to perform in diverse conditions, resist leakage, and endure mechanical stress.
Polyacrylate (ACM) Oil Seals

Figure 7: Oil seals for steel production equipment (rolling mill)
Types of oil seals
Regular inspection and maintenance of spark plug wires and spark plugs are essential to identify signs of wear, damage, or deterioration. Proper replacement of worn or fouled spark plug wires and spark plugs is crucial for maintaining the efficiency and reliability of the ignition system. Adhering to recommended service intervals and using high-quality replacement components are essential for optimizing the performance and longevity of the vehicle's ignition system.
Outer case
VMQ (silicone)
An oil seal is designed to perform three major functions: to prevent lubricants from leaking outside the seal even under high pressure, to act as a barrier to retain the lubricating oil, and to prevent dirt and other contaminants from entering the unit.
Nominal seal width
b, mm
This is almost similar to that of ‘A’ type seal. But this has the metal case placed outside. When the housing is rough, temperature is high and working conditions are severe, this type is preferred