Valve adjustment formula of four-cylinder diesel engine

1, adjusted by a four-cylinder engine with the ignition sequence of 1→3→4→2;

(1) and 1 cylinders are at the top dead center of the compression stroke, and their intake and exhaust valves are closed (both adjustable);

(2) Cylinder 3 is at the bottom dead center of the intake stroke, and its exhaust valve is closed (adjustable), and the intake valve is not completely closed (adjustable) due to the late closing angle;

(3) Cylinder 4 is at the top dead center of the exhaust stroke, and its intake valve and exhaust valve are in a superposed state (both are not adjustable);

(4) Cylinder 2 is at the bottom dead center of the power stroke, with its exhaust valve open (not adjustable) and intake valve closed (adjustable).

2. Adjust the valve of the four-cylinder engine with the "double-row no-entry method";

When the pistons of (1) and (1) cylinders are at the top dead center position of the compression stroke, the valves of (1) cylinders can be adjusted;

(2) The exhaust valve of the third cylinder can be adjusted;

(3) The intake and exhaust valves of the fourth cylinder are not adjustable;

(4) The intake valve of the second cylinder can be adjusted. After the first adjustment, rotate the piston so that the fourth cylinder is at the top dead center of the compression stroke. At this time, the intake valve and exhaust valve of 1 cylinder are not adjustable. The third cylinder can adjust the intake valve;

(5) The intake and exhaust valves of the fourth cylinder can be adjusted; The second cylinder can adjust the exhaust valve.