What is the method for adjusting valves in a four-cylinder engine?

[VivienneLynn]

Four-cylinder engine valve adjustment methods are as follows: 1. Cylinder-by-cylinder adjustment method: According to the cylinder firing order, after determining that a certain cylinder's piston is at the compression top dead center position, the intake and exhaust valve clearances of this cylinder can be adjusted. After adjustment, rotate the crankshaft and gradually adjust the valve clearances of other cylinders using this method. 2. Two-step adjustment method: (1) Rotate the crankshaft to position the first cylinder piston at compression top dead center, aligning the flywheel mark with the inspection hole marking line. At this time, valves 1, 2, 4, 5, 8, and 9 can be adjusted (referring to the engine valve arrangement order from front to back); (2) Then rotate the crankshaft one full turn to position the sixth cylinder piston at compression stroke top dead center, and adjust valves 3, 6, 7, 10 plus two additional valves (i.e., 11, 12). This is essentially a memorization-based adjustment method. (3) During adjustment, while turning the adjustment screw, insert a feeler gauge between the valve stem end and the rocker arm and pull it back and forth until slight resistance is felt. Then recheck until the adjustment is appropriate.