3.9 cummins in ingersoll-rand DD90

[FSUPERDUTY]

Any equipment mechanics off the top of your head no what full load boost should be? We hare having a power issue with one at work.It will vibrate one drum but as soon as you kick the second drum in it falls on it's face! It's only getting about 4lbs of boost.fuel and air filters have been changed.Also I belive it's a 125horse engine! just looking for some hints before it gets towrn into.Thanks

[macmaniac1]

fuel supply issue? maybe blockage in the tank or lines? A friend had this problem with his portable welder with gas engine. The inside of the tank started to rust out and fill the system with debris. He has it hooked up to an external tank until he can get the internal one replaced.

[luckuslucas]

What IP does it have? We have two 3.9's at work (neither has a turbo), one in a skid steer, and one in a chipper. If I recall, one has an inline pump, and the other has a rotary pump. If you have a 4BT, then you probably have a boost line leading from the intake manifold to a diaphragm on the IP. This limits the amount of fuel delivered at low boost levels to prevent excessive smoke. We had a lot of trouble with a DT360 where the diaphragm was ruptured, so it would never deliver the fuel amount of fuel. This may be a total shot in the dark, but worth looking into before tearing the motor apart.

[FSUPERDUTY]

turns out the diaphfragm for the waste gate on the turbo was ruptchured the turbo was blleding every thing off.she is running full steam again! thanks scott