sjs2011
Mechanical
- Mar 25, 2011
- 3
Hello all,
We have an old diesel engine built in 1975. It is rated for 285 HP @ 1750 RPM. The problem is, as soon as engine loaded with fire pump, it's rpm drops down. For some reason it is not maintaining constant rpm. It drops down to ~ 1300 rpm (per manufacturer spec, there will 8% of rpm drop but this is more than that).
We have checked the fire pump and looks fine. We suspect it is the fuel system of the engine, however, two different companies had looked over the fuel system and didn't find any problem.
I believe that fuel pump also working good since I can bring up rpm by moving throttle shaft setting manually on loading condition. I am not sure if the governor setting inside the fuel system box has to do with this behavior. In other words, it seems that something is not telling fuel pump to crank up to meet load requirement or to maintain certain rpm.
All engine heads temperature are consistent and no sign of black smoke indicating combustion issue. Fuel and air filter have been checked and are ok.
Can any one help to resolve the issue?
Thanks in advance.
We have an old diesel engine built in 1975. It is rated for 285 HP @ 1750 RPM. The problem is, as soon as engine loaded with fire pump, it's rpm drops down. For some reason it is not maintaining constant rpm. It drops down to ~ 1300 rpm (per manufacturer spec, there will 8% of rpm drop but this is more than that).
We have checked the fire pump and looks fine. We suspect it is the fuel system of the engine, however, two different companies had looked over the fuel system and didn't find any problem.
I believe that fuel pump also working good since I can bring up rpm by moving throttle shaft setting manually on loading condition. I am not sure if the governor setting inside the fuel system box has to do with this behavior. In other words, it seems that something is not telling fuel pump to crank up to meet load requirement or to maintain certain rpm.
All engine heads temperature are consistent and no sign of black smoke indicating combustion issue. Fuel and air filter have been checked and are ok.
Can any one help to resolve the issue?
Thanks in advance.