What is the function of the cylinder head cover?
2 Answers
The functions of the cylinder head cover are: 1. To cover and seal the cylinder head, keeping the oil inside while keeping dirt and moisture contaminants out; 2. To separate the oil from the air; 3. To serve as an oil filler port; 4. To act as a mounting bracket for sensors, including the camshaft position and camshaft timing sensors. The cylinder head primarily seals the cylinder, forming the combustion chamber together with the piston and withstanding the effects of high-temperature and high-pressure gases. The cylinder head endures the mechanical load caused by gas forces and the tightening of cylinder bolts, as well as high thermal loads due to contact with high-temperature gases. To ensure good sealing of the cylinder, the cylinder head must not be damaged or deformed. Therefore, the cylinder head should have sufficient strength and stiffness.
As a car enthusiast, I feel the valve cover plays an indispensable role in the engine. It acts like a lid, covering the top of the cylinder head, primarily preventing oil from splashing out or dust from getting in. Without it, high-temperature oil would scatter everywhere during engine operation, not only contaminating the engine bay but also potentially causing safety hazards, such as oil leaks dripping onto the exhaust pipe and triggering a fire. Additionally, the oil filler cap on the cover allows me to add oil or check the oil level anytime, making maintenance convenient. Last time I worked on my car, I noticed the gasket had aged, and after replacing it, the engine ran smoother and quieter. I recommend regular maintenance checks on the sealing gasket—don’t wait until there’s an oil leak to address it, as this can save fuel and protect the engine. Relatedly, engine cleaning can also extend component lifespan and maintain overall performance stability.
