What is the valve clearance for Yuchai engines?

[LeAshley]

Yuchai engines come with an engine manual that specifies the valve clearance. If the manual is not available, you can adjust the intake valve to 0.3mm and the exhaust valve to 0.4mm. Valve clearance is set to ensure the proper functioning of the internal combustion engine's valve train, which operates at high speeds and elevated temperatures. The causes of valve leakage are as follows: 1. Poor contact between the valve head contact ring or valve seat: The contact ring may have spots or carbon deposits, or the contact angle with the valve may not meet the requirements, leading to poor sealing and leakage. 2. Excessive carbon buildup on the valve stem: This can hinder the smooth reciprocating motion of the valve, affecting its timely resealing and causing leakage. 3. Valve clearance being too small or other mechanical failures: This can lead to valve stem deformation, misalignment between the valve stem and its contact ring, resulting in leakage. 4. Fuel injection pump malfunction: This can cause poor fuel atomization or delayed injection timing, leading to burning of the contact ring between the valve and valve seat, thereby affecting the valve's sealing performance.