Diesel engine in the operation of mechanical failure, ranging from damage caused by the basic pieces, while the heavy mechanical accidents have led to the occurrence. Normally, before the failure of the diesel engine, its speed, sound, exhaust, water temperature, oil pressure and other aspects will show some signs of abnormalities, that is, the characteristics of fault warning. So the operator should be based on the characteristics of the signs quickly make the right judgments, decisive to take measures to avoid accidents.

1, “Speed” signs of signs of “speed” before the diesel engine will generally appear to take blue smoke, burning oil or speed instability phenomenon.

Handling measures: First, the throttle to stop the oil supply, and step down the brakes; Second, plug the intake pipe, cut off the air into the three; the third is to quickly release the high-pressure tubing to stop the oil; Fourth, the vehicle can be used in high-load heavy diesel load (Brake), so that the engine due to lack of friction and flameout.

2, stick cylinder failure warning features

Stick cylinder generally in the case of serious shortage of diesel engine occurred, sticky cylinder front engine running weak, water temperature table indicates more than 100 ℃, to the body drops a few drops of cold water, a “hissing” sound, and white smoke, Fast evaporative.

Treatment: idle for some time or turn off the crank crank to help cool, so that the water temperature dropped to about 40 ℃, and then slowly add cooling water. Be careful not to immediately add cooling water, otherwise it will lead to mechanical parts due to sudden drop in local temperature and deformation or crack.

3, punching tank failure omen characteristics

Crusher is a devastating mechanical failure, in addition to the valve down the cylinder caused by crushing the tank, mostly due to connecting rod bolts caused by loose, connecting rod bolts loose or stretched, the rod bearing with the gap increases, which When the crankcase parts can be heard “blah” the percussion, percussion from small to large, the last connecting rod bolts completely off or broken, connecting rod and bearing cover thrown out to break the body and related parts.

Treatment: immediately stop maintenance, replacement of new pieces.

4, the characteristics of the failure of the burner

Diesel engine work in the speed suddenly reduced, the load increased, the engine black smoke, oil pressure drop, crankcase “chirp” dry friction sound.

Treatment measures: immediately stop, dismantle check connecting rod bearing, identify the cause, repair replacement.

5, broken shaft fault omen characteristics

When the head of the North Mercedes-Benz accessories diesel engine crankshaft journal shoulder due to fatigue caused by hidden cracks, the fault symptoms are not obvious, with the expansion of the increase in the crack, the engine crankcase dull knocking sound, the speed changes percussion Aggravated, the engine black smoke, and soon, the percussion gradually increased, the engine jitter, crankshaft fracture, then turn off.

Treatment measures: found signs of immediate shutdown check and found that cracks should be promptly replaced crankshaft.

6, the precursor of the cylinder failure characteristics

Baotou North Mercedes-Benz accessories exhaust pipe serious black smoke and suddenly turn off the crankshaft can not turn. At this point can not start the diesel engine to work, but should identify the cause and be excluded.

Action:

(1) early detection of the cylinder should first increase the oil cylinder oil injection. Such as overheating phenomenon has not changed, can take a single cylinder to stop the oil, reduce speed, speed up the piston cooling and other measures until the overheating to eliminate.

(2) When you find the cylinder, you must quickly reduce the speed, and then stop. Continue to increase the piston cooling, while the car.

(3) If the piston can not be locked because of the killing of the piston, wait for the piston to cool for some time, then re-exercise to make it.

(4) When the piston is killed more serious, can be injected into the cylinder kerosene, until the piston after cooling fly flywheel or wheel.

(5) hanging cylinder inspection, the piston and the cylinder liner on the surface of the cylinder marks carefully grinding with oil stone. Damaged piston rings must be renewed. If the piston and cylinder liner is damaged, it should be renewed.

(6) Baotou North Mercedes-Benz accessories piston charge, you must carefully check the cylinder on the oil filling hole is normal. If the piston and cylinder liners are new, after the installation should be run-in, when running from the low load began to gradually load and continuous operation.

(7) If the cylinder accident can not be repaired or not allowed to repair, you can take the cylinder method to continue to run.