How to adjust the valve of Yuchai 2 1 15? Ask the diesel engine maintenance master to explain.

The method of adjusting the valve clearance twice can be adopted, that is, all the valve clearance adjustments can be completed by rotating the crankshaft twice. For example, for a 4-cylinder engine with the working sequence of 1, 3, 4 and 2, open the cylinder head, rotate the crankshaft and observe the valve movement of 4 cylinders. When the intake valve and exhaust valve overlap, it is the exhaust top dead center of cylinder 4. At this time, 1 cylinder is at the compression top dead center, which can be adjusted to 65438+. Then turn the crankshaft 360 degrees, find the compression top dead center of cylinder 4 according to this method, and adjust other valves. When adjusting, while tightening the adjusting screw on the valve rocker arm, insert the thickness gauge between the valve stem end and the rocker arm and pull it back and forth. If you feel slight resistance, check it again until it is suitable.