Views: 0 Author: Site Editor Publish Time: 2016-04-15 Origin: Site
Every day, many users and friends come to consult about diesel generator set failures. In order to let everyone know the causes and treatment methods of common failures simply and clearly, the staff of Haixing Power have sorted it out and shared it with everyone. We hope it will be useful to everyone. .
Common fault introduction:
1. Why does the exhaust pipe sometimes drip oil when the generator load is too low?
Since there are many places in the engine that use pressure seals, such as between the cylinder liner - piston - piston ring, and between the supercharger and the supercharger rotor shaft, this kind of seal is generally fully exerted when the engine is about 1/3 of the load. function, and slight leakage may occur when the load is small. Therefore, foreign engine manufacturers generally emphasize this in their manuals.
If the unit is operated under a small load, the following faults will occur as the running time continues:
①. The piston-cylinder liner is not well sealed, the engine oil flows up and enters the combustion chamber for combustion, and the exhaust emits blue smoke.
② For supercharged diesel engines, due to low load and no load, the supercharge pressure is low. It is easy to cause the sealing effect of the supercharger oil seal (non-contact type) to decrease, and the oil will escape into the supercharging chamber and enter the cylinder along with the intake air.
③. Part of the oil that flows up to the cylinder participates in combustion, while part of the oil cannot be completely burned and forms carbon deposits on the valves, intake passages, piston tops, piston rings, etc., and some of the oil is discharged with the exhaust. In this way, engine oil will gradually accumulate in the exhaust passage of the cylinder liner, and carbon deposits will also form.
④. If the oil in the supercharging chamber of the supercharger accumulates to a certain extent, it will leak out from the joint surface of the supercharger.
⑤ Long-term low-load operation will more seriously lead to increased wear of moving parts, deterioration of the engine combustion environment, etc., leading to early overhaul period. Therefore, foreign diesel engine manufacturers emphasize that the low-load/no-load operating time should be minimized when using naturally aspirated or supercharged engines, and stipulate that the minimum load cannot be less than 25%-30% of the rated power of the unit.
2. The diesel engine stalls or runs unstable
Failure situation | Possible reasons | Exclusion method |
Diesel engine is difficult to start or | Contaminated or unsuitable fuel | Drain fuel and refill with appropriate fuel |
There is air in the fuel system or the fuel system pipeline is not locked | Drain the fuel lines and lock the fuel system lines | |
Blocked fuel line | Clean fuel lines | |
Nozzle assembly or fuel pump failure | Replace the nozzle assembly or fuel pump | |
Poor adjustment or malfunction of the electronic speed regulator | Adjust or replace the speed regulator | |
overload | remove partial load | |
Oil valve failure | Check or replace oil valve |
3. The diesel engine cannot start
Failure situation | Possible reasons | Exclusion method |
Diesel engine cannot start | Improper startup process | Start according to the instructions |
Is the battery electrolyte thin or not? | Replace battery or restart | |
Improper battery installation | Connect the battery as specified | |
Battery wires are defective, corroded or loose | Lock all loose connections and clean any corroded joints | |
Control wire failure or looseness | Check control wires for repair or locking | |
Engine start relay failure | Replace starting relay | |
Start/stop switch failed | Replace the start stop switch | |
Starter motor auxiliary translator failure | Replacing the starter motor to assist with translation | |
Starter motor failure | Replace starter motor |
4. Diesel engine oil pressure is too high indication
Failure situation | Possible reasons | Exclusion method |
Oil pressure indication is too high | Oil pressure transmitter failure, improper oil viscosity | Replace the transmitter, drain the crankcase oil, and add appropriate lubricating oil |
Oil pressure limiter failure | Replace oil pressure limiter | |
Oil pressure gauge or oil pressure sensor failure | Replace oil pressure gauge or oil pressure sensor | |
Not enough lubricant | Add lubricating oil to the appropriate location |
5. Diesel engine oil pressure is too low indication
Failure situation | Possible reasons | Exclusion method |
Oil pressure indication is too low | Too little oil | Add engine oil to the appropriate level on the oil dipstick |
Pressure gauge failure or oil pressure detector failure | Replace the oil pressure gauge or oil pressure detector | |
Oil pressure transmitter failure | Replace transmitter | |
Oil filter blocked | Maintain filter | |
Improper oil viscosity | Drain the crankcase oil and add appropriate lubricant | |
Oil pump wear | Replace engine oil pump | |
Bearing wear | Replace bearings |
6. Diesel engine turbocharger leaks oil
Failure situation | Possible reasons | Exclusion method |
Turbocharger leaking oil | Turbocharger end plate loose | Tighten the screws of each end plate of the turbocharger |
Turbocharger housing failure | Monitor the housing and replace the turbocharger |
7. Diesel engine exhaust smoke turns white or blue
Failure situation | Possible reasons | Exclusion method |
Engine exhaust smoke turns white | Improper fuel | Drain the fuel and fill it with appropriate fuel |
When the car is cold | Add appropriate load | |
When the ambient temperature is low and it is difficult to start the engine | Install a preheater | |
Nozzle assembly failure | Replace nozzle assembly | |
Improper throttle adjustment | adjust throttle |
8. Diesel engine exhaust smoke concentration is too high
Failure situation | Possible reasons | Exclusion method |
Engine smoke concentration is too high | Inappropriate fuel | Drain the fuel and refuel properly |
Air intake system blocked | Check air intake system | |
Turbocharger turbine clogged | Replace turbocharger | |
Generator overload | Reduce its load to rated standards | |
Improper timing | Correct timing |
9. Diesel engine water temperature indication is low
Failure situation | Possible reasons | Exclusion method |
The water temperature gauge indicates low | Thermostat failure | Replace thermostat |
Radiator capacity is too large | Change radiator capacity | |
Temperature detector failure | Replace temperature detector | |
Thermometer failed | Replace thermometer |
10. Output voltage is unstable
Failure situation | Possible reasons | Exclusion method |
Output voltage is unstable | The wire connection part is loose | Check each connection part and repair it |
Voltage-current selector switch failed | Replace the switch | |
Voltage adjustment resistor failure | Replace the voltage regulating resistor | |
Voltmeter failure | Replace voltmeter | |
Defective voltage regulator or unadjusted voltage regulator | Check regulator | |
The unit operates with excessive vibration | Check the shock absorbing equipment of the unit | |
Unstable engine speed | Adjust or replace engine fuel system parts to stabilize speed |
11. Generator output voltage is too high or too low
Failure situation | Possible reasons | Exclusion method |
Generator output voltage is too high or too low | Voltage adjustment resistor (VR) failure | Replace voltage adjustment resistor |
Regulator setting error | Check the adjuster | |
The variable electric group used for voltage adjustment does not match the voltage regulator. | Replace the voltage adjustment resistor to match the automatic voltage regulator | |
load imbalance | Check load conditions |
12. The operating frequency of the generator is unstable
Failure situation | Possible reasons | Exclusion method |
Generator operating frequency is unstable | There is air or water in the fuel | Bleed the fuel system |
Nozzle assembly failure | Replace nozzle assembly | |
Improper throttle adjustment or blocked oil line | Adjust the throttle or clean the oil line | |
Period converter or period meter failed | Replace cycle rate converter or cycle rate meter | |
Electronic speed regulator failure | Check electronic speed regulator and speed sensor | |
The unit vibrates too much during operation | Check the shock absorbing equipment of the unit | |
Load too big | remove partial load | |
Fuel filter failure | Check fuel filter | |
Fuel pump failure | Check fuel pump |
