The role of automobile gaskets

1. Sealing function
Prevent leakage: Gaskets are used to seal joints (such as cylinder heads, Oil Pans, exhaust systems, etc.) to prevent leakage of oil, coolant, fuel or gas. For example:

Cylinder gasket: seals the cylinder and cylinder body to prevent leakage of high-pressure gas and coolant.

Oil pan gasket: prevents oil from leaking from the bottom of the engine.

Pressure and temperature resistance: Metal or graphite gaskets are used in high-temperature and high-pressure parts (such as exhaust manifolds) to ensure sealing.

2. Adjust the gap and thickness
Dimensional compensation: Shims can fine-tune the distance between parts. For example:

Bearing gasket: adjust the bearing preload to avoid being too loose or too tight.

Gearbox gasket: controls gear axial clearance.

3. Vibration and noise reduction
Vibration buffering: Rubber or cork gaskets can absorb vibrations of the engine and suspension system and reduce noise (such as engine bracket gaskets).

Prevent direct metal contact: reduce friction and noise between parts.

4. Anti-corrosion and insulation
Isolate different metals: avoid electrochemical corrosion (such as using insulating gaskets between aluminum cylinder blocks and steel bolts).

Electrical insulation: Some gaskets prevent the passage of electrical current (e.g. sensor gaskets).

5. Common gasket types
Metal gasket: copper, aluminum, steel, resistant to high pressure and high temperature (such as exhaust system).

Non-metallic gaskets: rubber, silicone, cork, paper-based (such as oil filter seals).

Composite gasket: multi-layer structure (such as graphite + metal), taking into account both flexibility and pressure resistance.

6. Effects of Failure
If the gasket is aged or damaged (such as cylinder gasket burnout), it will cause:

The oil is mixed (emulsified) with the coolant.

Engine power loss and overheating.

Oil or gas leakage may cause safety hazards.

Summarize
Although the gasket is small, it is a key component for the reliability and durability of the car, directly affecting the sealing, mechanical precision and driving comfort. Regular inspection (such as paying attention to gasket leakage when changing the oil) can avoid larger failures.