[byrd126]

I just rebuilt an 05 cummins due to a dropped valve seat. I replaced all the piston rings, one piston, new head, all new bearings on everything by the customers orders. I got everything back together and started it. It showed oil pressure on the gauge but then dropped to zero. So i hooked a mechanical guage up and still had no pressure. So i thought maybe the mechanical is bad....i took the line off the housing and started it....NOTHING came out.. I then replaced the oil filter thinking it was a bad oil filter even though it was brand new...still didnt cure the problem... Does anyone have any ideas??? I need to have the truck done as soon as possible as college ended last week and im still working on it at the college. Thanks guys!

 

[byrd126]

Thanks for the bump. Anyone??? anything???

 

[byrd126]

I torqued the tube and im positive i put the gasket on the suction tube so im ruling that out. That was the first thing i thought of but it couldnt be. I also took the cap off the relief valve and pulled the spring and valve out and it seemed fine. it slid in and out pretty smooth. The engine didnt have any oil issues before the rebuild that i know of since there werent any spun bearings or cooked bearings but do you think it could be a bad pump??? it is the original pump but maybe it was almost done for and since it lost its prime it doesnt quite have enough suction to reprime??? Ive tryed forcing oil into the oil filter housing to get it to prime but no luck. Thanks again....im up for ANY ideas

 

[byrd126]

Nah i doubt it. I super cleaned everything including the block. its was completely torn down and rebuilt....im thinking its the oil pump but i dont know. I need some more opinions before i tear it back apart because i really dont want to pull the front cover to find nothing wrong and then have to pull the pan. or the other way around.