When a user purchases a mixer truck to use a short period of time in a certain part of the diesel engine, it often accompanies the operation of the machine to issue an abnormal noise. When the mixer diesel engine is in operation, its “unique noise” is varied and huge, and it is difficult to identify. It often causes a lot of troubles for the maintenance personnel of the machine, thereby delaying the maintenance time. However, in the general maintenance process, we hope to summarize and control its regularity, and we can identify the noise caused by the increase of gap due to wear: if the small parts collide, the tone is high, the amount is weak, and the sharpness is sharp. And hurry; large parts of the impact, the tone depression; small parts and large parts of the impact, the sound is like a small hammer hammer drill; bearing and the shaft collided, the sound is dull and dull. The characteristics and recognition steps of several common abnormal sounds are as follows.

(1) When the diesel engine of the mixer truck suddenly tampers with the load, the rushing “air, air, and air” dull sounds can be clearly heard in the crankcase near the center (in the middle of the cylinder block to the lower area), and the load or speed The dramatic change in the increase, the sound increases, open the mixer and add fuel oil cover can be heard more understand, no load is not obvious. This is due to the excessive wear of the connecting rod to form a common gap between the connecting rod and the crankshaft connecting rod journal. If a certain cylinder of the diesel engine is cut off, if the abnormal sound disappears quickly, the interpretation is the connecting rod of the cylinder. Tiles ring.
(2) When the mixer diesel engine has a heavy and continuous knocking sound in the lower part of the crankcase, the sound at a low speed is clearly discernible, and the heavy load is more obvious, and the oil pressure of the same opportunity decreases. This is the gap between the crankshaft main bearings of the mixer truck. Due to the large cause; when the mixer truck advocates that the machine suddenly tampers with the speed at low speed, a “bang and click” sound is generated at the upper part of the cylinder, which is caused by the common gap between the piston pin and the connecting rod bushing or the piston pin seat. If the mixer advocating high-speed operation of the machine, issued "creaking, creaking" slamming sound, suddenly reduced when the throttle is particularly serious, this is due to the axial clearance of the main shaft is too large; heard in the cylinder full length part of the roar, Drowsy "open, empty" knocking sounds, and the invention of a gas bubble when opening the oil cap (explaining a leak phenomenon), which is caused by the piston and the cylinder sleeve common gap is too large; if in the same part Slightly leaning against the crankshaft to hear the "beep, bang, bang" impact sound, is the link rod twisted to cause it to shake in the matter of the knocking sound, the latter two sounds can be clearly heard when changing the speed, and easier Difference; along the cylinder, the next time there is a similar small hammer hit the sound of iron, diesel engine exhaust pipe exhaust blue smoke (accompanied by burning oil phenomenon), with a long handle screwdriver arrived in the cylinder easier to listen to It can be identified that the piston ring of the mixer is too large or the ring is broken. . . . . . . . . . . . .

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