How to adjust the engine valve clearance?

The common method to adjust the valve clearance is cylinder by cylinder adjustment:

First, prepare tools: feeler gauge, 12 wrench and screwdriver.

2. Turn the engine to the top dead center and adjust the exhaust valve of one cylinder, the intake valve of one cylinder, the intake valve of two cylinders and the exhaust valve of three cylinders.

1, loosen the cylinder exhaust valve nut with a wrench;

2. Then screw the screw in the nut to the end with a screwdriver, and then screw it for half a turn to tighten the nut;

3. Insert it into the gap with the ruler of the feeler gauge. If you can drag easily, the gap will be normal.

4. Adjust the intake valve of a cylinder in the same way, and loosen the intake valve nut of a cylinder with a wrench;

5. Then screw the screw in the nut to the end with a screwdriver, and then screw it for half a turn to tighten the nut;

6. Use the ruler of the feeler gauge to plug it into the gap. If you can drag easily, the gap will be normal.

3. Turn the crankshaft 360 degrees, that is, camshaft 180 degrees; Then adjust the remaining two-cylinder exhaust valve and three-cylinder intake valve in the same way. 1. The valve clearance adjustment method is as follows: remove the valve cover, remove the valve cover fixing screw, and carefully remove the valve cover, taking care not to damage the valve cover gasket. Wipe the oil on the valve and rocker shaft with a rag to facilitate valve adjustment.

2. Find the compression top dead center of 1 cylinder, turn the crankshaft or pry the flywheel with a hand crank to make 1 cylinder at the compression top dead center position. When viewed from the front of the engine, the timing pit of the crankshaft pulley is aligned with the timing mark. On some large vehicles, the marking line of the cylinder 1-6 of the flywheel housing inspection hole is aligned with the timing mark of the flywheel housing.

3. According to the principle of engine structure, we know that when each cylinder is at compression top dead center, the valves of the cylinder are closed. So you can open the distributor cover, determine the position of the high-pressure branch pipeline of each cylinder, and rotate the crankshaft. When the distributor points to the position of the high-pressure branch pipeline of the cylinder, the cylinder will be at the top dead center of the compression stroke at the moment when the contact is disconnected.

4, cylinder by cylinder adjustment method. Because the order of engine valves is different, it is difficult to remember the order of intake valves and exhaust valves. The throttle clearance can also be adjusted cylinder by cylinder according to the ignition sequence or injection sequence of the engine. In order to accurately adjust the valve clearance, you can adjust the clearance between the intake valve and the exhaust valve cylinder by cylinder using the ignition head direction of the distributor introduced earlier.