Guangdong LongHong Electrical Equipment Co.,Ltd

1, the diesel engine can not start

The successful start of the diesel engine must ensure a high enough speed, good cylinder compression force, timely spray into the atomization of good fuel. In addition, there must be a certain temperature, so that the atomized fuel to fire state.

Can not start, first check the circuit. Press the start button, start the motor without action, it is a circuit break or poor contact. If only the start gear and the flywheel ring beating sound, it is large and small gears failed to engage, this time as long as the flywheel disk to a few teeth can be moved. If the starting motor to turn weak, low speed, it is the battery power is low.

If the starting motor is running strong, normal speed without fire, nozzle is not called, exhaust pipe smoke-free, compared with the fuel system failure. Or can start, turn a few times and turn off, then the fuel inside the air or water.

Start the motor to start the speed, although the fuel injection nozzle calls, is not easy to start, and there is leakage sound. After stopping the machine with a screwdriver drive wheel, if the weak, or resistance is very small, the flywheel no rebound phenomenon, then the lack of compression.

If the ambient temperature is too low, or the machine stops for too long, the oil is too thick, moving parts resistance, piston and cylinder gap is too large, lack of compression, are difficult to start. At this point the application of hot water or steam and then start the machine preheat.

2, generator power shortage

Diesel engine is characterized by low speed operation is not smooth, high-speed exhaust pipe black smoke, abnormal sound. Diesel engine did not reach the overhaul period, the lack of power is mainly fuel supply system failure and the cylinder compression caused by insufficient.

First empty car inspection, if you increase the throttle, empty car can reach the maximum speed, the failure in the work of machinery. If the empty car speed does not increase, then the fault in the diesel engine.

Check the exhaust manifold root temperature, if a cylinder temperature is low, the cylinder does not work or work properly. Low-speed finger can be used for touch inspection, high-speed is not to prevent scalding fingers. At this point to the exhaust manifold spit saliva, if the saliva is not issued "bared" sound, the cylinder is faulty.

High pressure tubing with your fingers, if the pulse is strong, and the temperature higher than the other cylinder, said the pump well, and the nozzle may be in full close position biting or nozzle pressure regulator spring pressure is too large, if the high-pressure tubing pulsation, temperature and The other cylinder consistent, that the nozzle in the fully open position to seize or pressure regulating spring fracture. If the high-pressure tubing at high speed without pulsation, the temperature higher than the other cylinder, said high-pressure pump failure. If the exhaust pipe at low speed smoke ring, said high-pressure pump oil valve spring fracture or gasket failure. If the fuel system without abnormal symptoms, the fault is the cylinder compression.

In operation, if the increased oil under the blow-by gas increases, the environment smell of oil thick, it is the piston and cylinder gap is too large, poor sealing. If the parking wheel with a screwdriver drive wheel two weeks, feel the increase in the number of resistance and the number of cylinders ranging from the handle can be judged according to a cylinder compression bad. If the cylinder head and the cylinder at the junction of a leak sound, the environment is thick smoke, smoke flavor, that the cylinder pad leakage. If the cylinder shell at the metal percussion sound, and the speed with the relevant, regular, then the rocker arm and valve clearance is too large. If the cylinder head at the leakage sound, low speed, the intake manifold root temperature is high, parking at the intake pipe at the leak sound, then the intake valve leakage; if the exhaust pipe at high speed black smoke, night Exhaust pipe spit flames, then the exhaust valve leak.

3, the use of a sudden turn off automatically

Diesel automatic flameout for a variety of reasons, but mainly two aspects, one fuel supply disruption; second movement blocked.

In normal operation, if the speed gradually slows down, the outbreak of sound gradually weakened, water temperature, oil temperature, pressure are normal, to promote the throttle no effect, continue for some time after the flame, stop with a screwdriver to drive flywheel, then the fuel Supply is poor or interrupted.

In the process of operation, the oil pressure is normal, but the oil temperature is high, the water temperature increases, and a taste of paint, cooling water outlet less water or no water, steam, the machine running difficult, rude sound, near the parking cylinder Sound, speed gradually reduced, the final stop, the flywheel is reversing difficulties, parking disk does not move after the flywheel. Machine temperature decreased, but also disk moving flywheel, which can be judged by the piston killed.

In the process of operation, the water temperature is normal, the oil pressure drops, the oil temperature rises, the oil has the metal debris, the organic oil burns the smell, the machine vibration aggravates, the sound is abnormal, the rotational speed reduces gradually, stops the inertia turning time is short, stops After the disk does not move the flywheel, the machine still does not move after cooling the flywheel, you can determine the spindle burning tile, also known as holding axle.

4, oil sump oil level increased

Diesel engine oil level increases, indicating the leakage of oil into the cooling water. It is mainly by the cylinder cover, cylinder liner, cylinder block and cylinder seals, oil cooler seal failure caused.

Check, can be hand-aligned with the oil out of the mouth of the hot air, if the hand has condensation, then the cooling water inside the oil. When the low-speed or stop the oil without pressure, but also that the cooling water inside the oil.

If the oil sump oil surface rise, start difficulties, the formation of water, exhaust pipe at low speed to take white smoke, then the cylinder head cracks, cooling water into the cylinder. If the oil level rises significantly, start normal, low-speed exhaust pipe does not take white smoke, it indicates that the cylinder block or cylinder rubber seal failure, cooling water directly into the oil pan.

5, oil consumption increased

Diesel engine oil consumption increase is mainly due to oil into the cylinder combustion, the cylinder with oil leakage, crankshaft oil seal failure and other causes.

Low-speed exhaust pipe smoke smoke, it is the oil into the cylinder combustion, mainly piston and cylinder clearance is too large, or the piston ring to go counterparts caused. If the phenomenon occurs after repair, it is caused by oil ring chamfer mounted. If the screws at the joints are loosened, the gaskets can cause leakage.

If the rotating flywheel throws oil droplets, it indicates that the spindle oil seal has been damaged.

6, the oil pressure drop or no pressure

Reason oil pump damage, oil blockage or leakage, pressure regulating spring fracture, pressure gauges failure and so on.

Diesel engine in the process of running, if the pressure gauge pointer is always parked in the lower pressure position, parking does not change the position, it is the pressure gauge failure.

Just start, the oil pump gauge pointer does not move, the sump liquid level no change, and can not hear the sound of fine filter rotor running, then the oil pump failure.

Oil pressure is low and unstable, the pressure was gradually declining, indicating the oil leakage. This is because the strength of weak gasket in the role of the first pressure in the oil under the first small gap, the gap after the gradual expansion of the oil flow back to the oil pan short circuit.

During operation, adjust the oil pressure screw with a screwdriver. If the pressure does not change, it indicates that the pressure regulating spring is broken.

7, the piston pin and the connecting rod gap is too large

Diesel engine at low speed, the cylinder in the upper part of the crisp percussion, the sound increases with the load increases. High speed, the sound disappeared. Sound and oil pressure has nothing to do, the oil gauge pointer no change. After parking with a screwdriver toggle flywheel one or two teeth, the piston for reciprocating motion, if the impact of feeling, then the piston pin and connecting rod gap is too large.

8, connecting rod bearing clearance is too large or broken

Diesel engine with low load, in the lower part of the cylinder impact sound, oil pressure gauge pointer swing frequency and sound frequency of the same sound with the speed of change at the same time, the sound is greater than the machine outbreak of sound. After parking with a screwdriver toggle flywheel one or two teeth, the sound clearly, there is a sense of impact that the connecting rod bearing clearance is too large or broken.

9, crankshaft fracture

Diesel engine in the process of running, suddenly issued a strong cracking of the crash, oil pressure plummeted, and then automatically turn off. With both hands to grasp the front wheel crankshaft reciprocating push and pull, if the crankshaft has a larger axial movement, while the flywheel failed to move with the crankshaft synchronization, then the crankshaft fracture.

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