What should I do if the pressure of heavy truck pump is high and air leaks?

Air leakage from the valve will lead to the decrease of cylinder compression force and insufficient fuel combustion. Check the tightness of the valve in the following ways: Listen, when the valve leaks seriously. When the engine is working, I hear the hiss of "spy, spy". Look at the smoke, the valve will emit black smoke when it leaks, and the air filter will leak.

Simply test the compression force, start the diesel engine, turn off the throttle when the standby temperature rises to 50℃, and turn the crankshaft, which will feel the compression force is small.

Further shaking the crankshaft to the compression stroke of the cylinder with less compression force will stop at 1/2, and continue shaking after 15~25 seconds, and the compression force in the second half of the compression stroke will be very small.