Can the valves of a car engine be adjusted?

The valve clearance of the engine is adjusted as follows:

1) Rotate the crankshaft to align the belt disc mark with the engraved line, which is the end of the compression stroke of one cylinder or four cylinders. At the end of the compression stroke of a cylinder, the valve clearance of the 1st, 2nd, 4th, and 6th valves can be adjusted from the front of the engine.

2) The thickness gauge of the specified thickness is inserted between the foot of the valve and the rocker arm, and pulled back and forth, when there is a slight resistance, it is appropriate, otherwise it should be adjusted.

3) When adjusting, loosen the lock nut, turn the adjusting screw, insert the thick gauge into the gap back and forth, feel a slight resistance indicating that the gap is appropriate, fix the adjustment screw, and finally recheck it, if the gap changes, it needs to be readjusted.

4) After the above-mentioned valve adjustment is completed, turn the crankshaft again, so that the mark on the flywheel is aligned with the engraved line on the window hole of the flywheel housing again, and the four-cylinder is at the end of the compression stroke. Counting forward from the four cylinders, the clearance of the 1st, 2nd, 4th, and 6th valves can be adjusted.

The valve of the automobile engine can not be artificially adjusted, and they have their own corresponding adjustment mechanism, such as VVT timing adjustment mechanism, or camshaft position adjustment, which are variable valve phase adjustment mechanisms.

The valve clearance is adjustable and is done by replacing the adjustment gaskets of different thicknesses.

The engine is divided into hydraulic tappet and rocker type, and only the rocker type can be adjusted.

Can the engine valves be adjusted? Many cars nowadays, some can be adjusted, some cannot be adjusted, and the valve clearance can be adjusted with a rocker arm.

1.Cylinder-by-cylinder adjustment method.

According to the cylinder ignition sequence, after determining the position of the piston of a cylinder at the top dead center of compression, the inlet and exhaust valve clearances of this cylinder can be adjusted; After adjustment, shake the crankshaft, and gradually adjust the valve clearance of other cylinders according to this method.

2.The two-adjustment method is used.

Rotate the crankshaft so that the piston of the first cylinder is at the top dead center of compression, and the flywheel mark is aligned with the inspection hole engraved line, and the valve can be adjusted and the valve (refers to the order of the engine valve from front to back); Then shake the crankshaft one circle so that the six-cylinder piston is at the top dead center of the compression stroke, and then adjust the "plus two" (i.e. ) valves, which is actually a mnemonic adjustment. When adjusting, while tightening the adjustment screw, insert the valve stem end with a thick gauge and pull back and forth between the rocker arm to feel a slight resistance, and then check again until it fits.

The cylinder-by-cylinder method requires a large number of crankshafts to be rotated, and it takes a lot of time to check and adjust, but for engines with serious wear, it is more accurate to use the cylinder-by-cylinder method to check and adjust the valve clearance. It is more time-saving and labor-saving to adjust the valve clearance twice, but for different models, it is necessary to memorize different adjustable valve sequence numbers, and the model is complex, so it is difficult for maintenance personnel to remember.

1. Loosen the tensioner wheel 2, remove the timing belt, 3. Rotate the crankshaft (to the top dead center of the 1 cylinder compression) 4, according to the work sequence of the 4 cylinders 1342

Double row does not enter. To adjust 5, gasoline engine intake exhaust, diesel engine intake and exhaust, and then rotate a week, 4 cylinders compress top dead center, press not into the double row to adjust 7, and finally install it in order.

The specific operation steps of the Yuchai engine regulator are as follows: 1. Use a wrench to loosen the adjustment screws of the Yuchai 4-cylinder engine. 2. Use a screw ZD knife to twist the screw shaft of Yuchai 4-cylinder engine.

3. Use your fingers to lift the screw shaft of Yuchai 4-cylinder engine upward. 4. After determining the position, use a wrench to tighten the adjustment screws of the Yuchai 4-cylinder engine. 5. Tighten the gap nut of the intake valve of the Yuchai 4-cylinder engine.

Operational) Extended information: Diesel engine valve clearance adjustment method 1. Cylinder-by-cylinder adjustment method (1) That is, according to the cylinder ignition sequence, determine the position of the piston of a cylinder at the upper stop point of pressure retraction, and adjust the cylinder inlet and exhaust valve clearance. (2) When the adjustment is completed, the crankshaft is rotated until the valve clearance of the other cylinders is gradually adjusted according to this method.

2. Two adjustment method (1) that is, first shake the crankshaft so that the piston of the first cylinder is at the top dead center of compression, and the flywheel mark is aligned with the inspection hole engraved line. (2) Then shake the crankshaft one circle, adjust by memory method, and pull back and forth between the valve stem end and the rocker arm with a thick gauge while tightening the adjustment screw, until you feel a slight resistance and make the six-cylinder piston at the top dead center of the compression stroke.

The adjustment method of the engine valve should be based on the timing position of the engine, and the working principle of the four strokes, air intake, compression, ignition, and exhaust. Follow the order in which each cylinder of the engine works, and then fine-tune it.

1.Turn the 1 cylinder to the compression top dead center (there is a scale on the crankshaft pulley or a mark on the crankshaft flywheel) and align the pointer of the 0 scale mark or timing gear chamber. Adjust the intake and exhaust valves of 1 cylinder, the intake valves of 2 cylinders, and the exhaust valves of 3 cylinders.

Turn 360° again and adjust the exhaust valves of the 2-cylinder, the intake valve of the 3-cylinder, and the intake and exhaust valves of the 4-cylinder.

2.There is also the fact that you can first use the wooden knob to change the cone, try which cylinder is not loud or not too loud, refer to the valve clearance of this cylinder, and adjust the valve clearance of the other 3 cylinders.

3.The adjusted valve clearance should be slightly larger for cold cars and smaller for hot cars. Generally, the engine is turned off after the car is hot, and the valve clearance is adjusted.

4.The method of adjusting the valve for the last 6 cylinders is basically the same as that of the 4 cylinders.

Cylinder-by-cylinder adjustment method: according to the cylinder ignition sequence, after determining the position of the piston of a cylinder at the top dead center of compression, the inlet and exhaust valve clearances of the cylinder can be adjusted; After adjustment, shake the crankshaft, and gradually adjust the valve clearance of other cylinders according to this method.

There are four types of L3, L4, L5 and L6 (the number represents the number of cylinders). The advantages of this layout engine are compact size, high stability, good low-speed torque characteristics and lower fuel consumption, which of course means lower manufacturing costs.

At the same time, the engine with an in-line cylinder layout is also relatively compact and can accommodate a more flexible layout. It is also convenient for arranging supercharger devices. However, the main disadvantage is that the engine itself is less powerful, and it is not suitable for models with more than 6 cylinders.

Turn a cylinder to the top dead center, count the valves up and down in order, turn the 1236 valves down, and turn the unadjusted valves down.

The ignition sequence is 1-3-4-2, first turn the 1 cylinder to the compression top dead center to adjust the near exhaust valve of the 1 cylinder, then rotate the crankshaft 180 degrees according to the working direction of the engine, turn the 3 cylinders to the compression top dead center to adjust the near exhaust valve of the 3 cylinders, turn 180 degrees again, turn the 4 cylinders to the compression top dead center to adjust the near row top dead center of the 4 cylinders, and adjust the 2 cylinders, each turn of the 6 cylinders is 120 degrees, and the 8 cylinders are 90 degrees each time. However, the 8-cylinder one generally does not need to be adjusted. In addition, you can also use the "double, row, no, in" method.

For example, 4-cylinder: 1-3-4-2 1 3 4 2 The first 1-cylinder compression top dead center double row does not enter the second 4-cylinder compression top dead center does not enter the double row Two fingers are adjusted close to the exhaust valve, the exhaust valve is adjusted by the row finger, and the exhaust valve is not adjusted near the exhaust valve, and the intake valve is adjusted by the intake finger.

Find the order of work ......Double row does not enter.