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14 kind of common faults of diesel generator

2017-02-06 09:36      Click:

14 kind of common faults of diesel generator

1, see smoke, wear up and down
Oil in diesel engine work, open the cover, if there is thick smoke from the oil cap, according to the smoke.The smoke is serious, piston, cylinder liner, piston ring parts such as serious wear and tear.Open the valve chamber cover, if there is a little bit blue or white smoke issued from the base of valve (the valve face), said the smoke.Smoking is serious, that the valve and valve seat wear serious or ablation, or valve clearance is too small or even no gap.
2, the carbon deposit, check condition
Diesel engine exhaust carbon deposit in dark gray, surface covered with frost, extremely thin deposit layer, good working condition of diesel engine.Carbon black color and not wet, show slight burn diesel engine oil.The vent of a cylinder carbon deposit thicker, shows that the cylinder injector work bad or cylinder sealing, should carry on the repair or replacement.Individual vent moist or organic oil flow mark, indicated that the burning oil cylinder, should be repaired.Each cylinder exhaust carbon deposit layer is thicker, and the color is deeper, more because of working temperature is too low, or injection too late after combustion phenomenon caused by severe.
3, check the water temperature, cooling
If diesel engine cooling water temperature too high at work (over 100 ℃), then you can show the diesel engine cooling water cavity cooling system scale is too thick or related components (thermostat, water pump, fan, etc.) low efficiency or invalid.
4, the distribution and the phase
Diesel engine after long-term work, timing gear, CAM surface, follow-up column and tappet can wear, the inlet and exhaust valves open and close time delayed and deviating from the optimum distribution phase, lower the volume efficiency, diesel engine power decrease.Therefore, diesel engine with gas phase should be inspected regularly, if do not conform to the requirements shall be adjusted in time.
5, the pressure, the air leakage
Pressure gauge measuring cylinder pressure are available, and find out the poor sealing cylinder.Reasons of the poor cylinder sealing valve clearance, or gap is too small, the piston and cylinder liner and piston ring end clearance is too large, the ring groove carbon deposit, etc.If in diesel engine work, close to the air cleaner can hear there are "PSST, HSS" blowing sound, then leak is associated with the valve.At this point, combining the smoking situation can confirm the causes of failure.
6, the exhaust, smoked
Diesel engine during normal work, generally do not smoke or take some light gray smoke, sometimes difficult to see with the naked eye.If smoke, it means less oil than gas cylinder, incomplete combustion.If the blue smoke, the cylinder liner and piston, valve and valve guide wear gap is too large;If the white smoke, the fuel mix into water, or diesel incomplete combustion, after vaporization from the exhaust.

7, the injection, check card lag
Fuel injection pump fuel injection should be unbiased, does not drip, good atomization, appropriate range, can hear the ringing when injection "sloped, sloped" sound, with the hand touch feeling pulse high-pressure tubing.Injection well oil system cannot fully illustrate: no problem.So you also need to check whether the throttle lever and joint credit card or loose wait for a phenomenon.
8, the timing, sooner or later
The timing is to point to check the injection timing, namely the fuel delivery advance Angle is in line with the regulations.Fuel delivery too late, diesel engine start difficulty, incomplete combustion, exhaust smoke, machine temperature is too high, lack of power.Oil supply too early, the diesel engine work from time to tome, easy attaint parts, prone to reverse when starting, but also affect the diesel engine power.
9, "phenomenon, check circuit
For electronic control diesel engine, the following two conditions will lead to diesel engine running out of steam.Thermal protection state: if the abnormal phenomenon, the temperature of the electronic control diesel engine may be cooling fluid temperature is too high;High inlet temperature;Fuel oil temperature is too high;Coolant temperature sensor line fault (such as open circuit);Air intake temperature sensor line fault (such as open circuit);The fuel temperature sensor line fault (such as open circuit).Appears after the above phenomenon, ECU will be automatically entered into a state of thermal protection.The thermal protection device widely used electronic control diesel engine, when the temperature exceeds set default values, ECU control injector to reduce fuel injection quantity, reduce diesel engine output torque, power down.Failure protection mode: if the malfunction of electronic control diesel engine electronic control component, may be rail pressure sensor line fault or damage;Fuel metering valve drive failure, valve damage or line fault;Diagnostic instrument display accelerator pedal cannot reach full open, etc.;Plateau trim cause;Rail pressure sensor signal drift;High pressure oil pump closed loop control such failure;Supercharging pressure sensor line fault or damage;Diagnostic instrument shows CAM signal loss (run only on crankshaft signal, the impact on the start time is not obvious), etc.;Diagnostic instrument shows the crankshaft signal loss (only on CAM signal operation, start for a long time), etc.ECU automatically into failure protection mode.Diesel engine can only work under a certain speed.Its purpose is to avoid bigger problems for diesel engine and vehicle equipment to open to the repair shop repair.
10, low pressure oil injection
Diesel engine from the fuel tank to the fuel pump inlet cavity in between, back to belong to the low pressure oil pipe line, when the pipe joint, washer and tubing oil due to damage, will make the air into the oil produces gas resistance, leading to poor drainage, difficulty in starting and accelerating engine slow fault phenomena, such as serious shut down automatically.When the tubing because of aging, deformation and impurities clogging reduce oil area, or the oil filter and oil dirty jams diesel filter, will cause the engine oil shortages in power decrease and starting difficulty.Checking and removing the fault can be finished in the car.Oil pump with the hand pump to a certain pressure, screw loose open gas, such as bubble overflow and exhaust, always shows oil into the air;If no bubbles but diesel overflow from the vent screw, then oil be blocked.Normal phenomenon is slightly loose open air screw and immediately there came out oil column with certain pressure injection.Troubleshooting method is to find out the damaged or aging of washer, joint or tubing to replace;To prevent such failure is often clean the oil filter and diesel filter, frequently check line, found that have a problem to solve in time.
11, oil transfer pump piston spring break
The engine stalling in the running, can't start.Unscrew the vent screw examination showed little or no fuel in the fuel injection pump low-pressure oil chamber, with the hand pump to the low pressure oil pump oil cavity filled with oil free air to restart, the engine back to normal, but after driving some distance to automatically shut down again.This failure phenomenon is likely to be oil transfer pump piston spring break.The fault can be ruled out, unscrewed the screw, the replacement of spring.
12 and oil transfer pump check valve seal is lax
Working properly after engine starting, but start the difficulties in parking stall after a certain time and unscrew the bubble overflow vent screw, should be row of clean air in order to start anew.This kind of fault for more oil transfer pump check valve seal is lax.Check method is unscrewed the screw oil transfer pump out the oil, pump to pump the fuel oil cavity filled with oil joint, such as oil level within the joint decrease rapidly, then check valve seal is not good.Check seal and remove the check valve, check valve spring is broken or deformation, whether the seal seat surface with particle impurities, take ground sealing surface according to the concrete cases, replace the check valve or check valve spring will be troubleshooting.Normal oil level in more than three minutes of the time don't fall, oil pumps to pump oil column from the joint strong.
13, high pressure oil pipe plug
When a cylinder of high pressure oil pipe due to deformation or impurities clogging when young to buy diesel generators, after starting the engine in the tubing parts may be obvious, and can't work normally because of the cylinder of engine power decline.Check method is to loosen the oil inlet end of the high pressure oil pipe line by cylinder nut, when tapping disappear after unscrewing a cylinder, can be concluded that the cylinder as the fault cylinder, after the replacement of tubing failure can be ruled out.
14, injector matching parts
When the injector needle valve is stuck in the closed position near the cylinder head in regular beat.When it is due to the fuel injection pump fuel supply pressure shock wave caused by fuel injector.Judgment method is loosen injector side high pressure tubing, such as tapping immediately disappear, can be concluded that the injector needle valve cylinder jammed.


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