What Causes Valve Leakage?
1 Answers
Valve leakage can be caused by the following reasons: 1. Wear and burning of the valve and valve seat working surfaces, leading to spots, pits, or carbon deposits. 2. Excessive clearance between the valve stem and the valve guide sleeve, causing the valve stem to wobble. 3. Weakening or loss of elasticity in the valve spring, or spring breakage. 4. Factors such as excessively small valve clearance. Additional related information is as follows: 1. The car valve, also known as the throttle, is responsible for introducing fuel into the engine and expelling exhaust gases. Traditional engines have only one intake valve and one exhaust valve per cylinder. This design is relatively simple, cost-effective, easy to maintain, and performs well at low speeds. However, its drawback is difficulty in increasing power, especially due to low charging efficiency and weaker performance at high speeds. 2. To improve intake and exhaust efficiency, multi-valve technology is now commonly used, with each cylinder typically having four valves (some designs feature three or five valves per cylinder, following the same principle, such as in the Audi A6 engine). A four-cylinder engine thus has a total of 16 valves, often denoted as "16V" in car specifications, indicating the engine has 16 valves in total.
