How many kilometers should the engine valve be adjusted?

[VanCameron]

Engine valve clearance is generally adjusted every 50,000 kilometers. Valve clearance adjustment method: Turn to the top dead center of the first cylinder, follow the 1-3-4-2 double-row non-entry sequence. For the four-cylinder top dead center, adjust in reverse order: double refers to adjusting the intake and exhaust valves of the first cylinder, 'exhaust' refers to adjusting the exhaust valve of the third cylinder, 'non-adjustment' means not adjusting the fourth cylinder, and 'intake' refers to adjusting the intake valve of the second cylinder. After the crankshaft completes one full rotation, adjust the remaining valve clearances. Valve clearance: This is set to ensure proper operation of the internal combustion engine's valve train. Since the valve train operates at high speeds and temperatures, components like valve lifters and valve stems expand when heated, which could automatically open the valves and cause poor sealing between valves and seats, leading to air leakage. To prevent this phenomenon, a certain gap is intentionally designed between the end of the intake/exhaust valve stem and the adjusting screw of the lifter (or rocker arm) - this gap is the valve clearance.