The piston pin is a kind of sharp and crisp metal knocking sound, which has the characteristics that the sound frequency of the engine increases with the engine speed, and the noise is generally not weakened.

The characteristics and judgment of the piston pin:

1. From idle speed to medium speed, the noise is more obvious.

Secondly, the engine speed is fixed in the most obvious position of the sound, and the "broken fire" test is carried out in the cylinder. The sound of the noise is weakened or disappeared after the fire is broken. When the lift is raised, a sound compound sound appears quickly, and then the sound is turned to normal, that is, the piston pin of the Baotou North running heavy steam fittings.

The ignition time is ahead of time, and the noise is more obvious.

(4) when the temperature of Baotou Bei Ben heavy duty truck engine rises, the noise usually does not weaken, sometimes it will be more obvious. This is a different point from the piston knocking.

In the use of vehicles, if there is a slight noise, it can still be used. If the noise is serious, we should check the gap between the bushing parts pin of Baotou and the bushing or the seat hole. When the gap is large, it should be repaired.