If diesel generators fail to start, you can analyse the causes from fuel system failure, electric starting system failure, insufficient compression pressure in the cylinder and the low ambient temperature and other factors.
1. Air in the fuel system
This is a common problem that a diesel generator fails to start normally.
Solution: Check whether the fuel oil pipe connector is loose or not, and ensure that the air is cleared from the fuel system. Loosen the bleed screw bolt on the diesel filter, and then use the manual oil pump to pump the fuel until the air bubble is gone.
2. Fuel Line Obstruction
Solution: Check whether the pipeline is smooth or not.
3. Fuel Filter Clogging
Solution: Clean the filter or replace the filter element
4. The Handle Position of Fuel Injection Pump Is Not Correct
Solution: The handle position should be pushed to no-load when starting the diesel generator set. Rotation speed is about 700-900r/min.
5. Fuel Injector Problem - Little fuel injection or fuel injection is not atomized
Solution: Remove the fuel injector, connect it to the high pressure oil pump, pry the fuel injection pump plunger spring and observe the spray condition. If necessary, wash the injection pump.
6. Oil Supply Problem - Oil transfer pump doesn't supply oil or the oil supply is brokenly.
Solution: Check whether the oil inlet pipe is leaked or not and the filter screen on the oil inlet pipe connector is blocked or not.
Electric Starting System Failure
1. Battery Power Shortage
The most common failure for diesel generator is battery failure.
Solution: Use the battery with sufficient power, or increase the battery to use in parallel. Replace the new start-up battery if necessary.
2. Circuit Wiring Error or Poor Contact
Solution: Check whether the wiring is correct and reliable.
The compression pressure in the cylinder is insufficient; fuel injection is normal but does not catch fire; or fuel oil inside the exhaust pipe
1. Excessive wear of piston ring and cylinder liner
Solution: Replace the piston ring, and replace the cylinder liner according to the wear condition.
2. Valve leakage
Solution: Check the valve clearance, vlave spring, as well as the sealing of the valve guide and seat. If the seal is not good, you should make a repair.
3. Combustion chamber volume is too large
Solution: Check whether the piston belongs to the model, if necessary, measure the combustion chamber volume.
Ambient Temperature Is Low
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Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem. Best Manuals
SOURCE: Onan 4000 RV Generator - where is the oil drain plug?
It should have a cover on the floor bottom that is held in place with two torx (star) screws. remove the cover and you can remove the plug with a 9/16 socket.
SOURCE: 99 ram diesel wont start
Did you check to see if there is power to the glow plugs if not then that may be the problem and if there is power when you cycle the key not to start but for the plugs to warm up you may have a bad glow plugs.
SOURCE: 04 f250 diesel cranks but won't start
this is an oil pressure problem, either a sensor is not sensing enough oil pressure, or the high pressure pump is not building enough pressure(possibly leaking or head is leaking). this engine requires 450 psi minimum oil pressure at the injectors to actuate the injectors.
SOURCE: onan genset generator in rv is running but no
on your generator ther is a reset if thats not it check for fuses if still no then u neda check the wires in the pluges if no then ur generator it self needs re bilt
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