How to adjust the valve of the engine?

Excessive engine valve clearance will reduce the valve lift, resulting in insufficient inflation and poor exhaust, and will also bring abnormal noise. The space between/between/between/rooms.

If the gap is too small, the valve will not be closed tightly when working, resulting in leakage and easy ablation of the valve and valve seat working surface. So we should do it according to the regulations seriously.

Adjust the valve clearance to ensure the normal operation of the engine.

When the valve is completely closed and the valve driving mechanism is located in the base circle of the cam, check and adjust the valve clearance. To this end, usually

When the cylinder compresses the top dead center, the valve clearances of the intake valve and the exhaust valve are simultaneously adjusted,

That is, the valve gap between the intake valve and the exhaust valve of the cylinder pointed by the ignition head. This method is called cylinder-by-cylinder adjustment.

In practical work, the following adjustment methods are often adopted: "within the line, within the line first" or "double exclusion". in this way

Just shake the crankshaft twice to adjust the valve clearance of the whole valve.

1) three-cylinder engine (Tianjin Li Xia TJ376Q engine)

When the cylinder 1 is located at the compression top dead center: when the camshaft semicircle key is located directly above.

Adjustable: 1 cylinder, 2 cylinders and 3 cylinders

go in and out

After turning the crankshaft once:

Adjustable: entrance and exit

2) four-cylinder machine

a、 1 - 3 - 4 - 2 4 - 2 - 1 - 3

Double row does not enter, double row does not enter.

b、 1 - 2 - 4 - 3 4 - 3 - 1 - 2

Double row does not enter, double row does not enter.

3) Five-cylinder engine (starting from 8 1, Volkswagen of West Germany introduced in-line five-cylinder engine)

1 - 2 - 4 - 5 - 3

Double row, no entry, double row, no entry