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- The '6' in the code denotes the thread size, which refers to the diameter of the spark plug's thread that fits into the engine's cylinder head. This size is crucial for a secure fit and optimal compression. The 'H' indicates the thread length, implying that it has a standard reach, ensuring the spark occurs at the perfect moment for maximum power output.
Valve Cover Gasket and Head Gasket: Critical Sealing Components
Figure 6: Oil seals for cars
Oil seals, also known as rotary shaft seals, are a type of gasket used to prevent lubricant leakage and contamination in rotating machinery by creating a barrier between the moving and stationary parts.

Rotary Wheel Of Auto Parts
Like any element of the engine, oil seals are subject to wear. Over time they can lead to possible leaks of lubricating liquid.
In choosing the right oil seal type for your application, it is essential to assess factors such as speed, temperature range, pressure levels, chemical compatibility, shaft material, and installation space limitations. By considering these factors carefully, you can ensure that you select an oil seal that will provide optimal performance and longevity in your specific application.