How to adjust the valve of a four-cylinder engine?

The adjustment method of four-cylinder engine valve is as follows: 1. Turn the cylinder 1 to the compression top dead center (there is a scale on the crankshaft pulley or a mark on the crankshaft flywheel) and align it with the zero scale line or the pointer in the timing gear room. Adjust the intake valve and exhaust valve of 1 cylinder, the intake valve of cylinder 2 and the exhaust valve of cylinder 3. Rotate 360 to adjust the exhaust valve of cylinder 2, intake valve of cylinder 3 and intake and exhaust valve of cylinder 4. 2. First, you can use a wooden handle screwdriver to listen to which cylinder is quiet, and adjust the valve clearances of the other three cylinders with reference to the valve clearances of this cylinder. 3. Adjust the valve clearance slightly larger when the car is cold and slightly smaller when it is hot. Generally, the engine is turned off after the hot car is started, and then the valve clearance is adjusted.