No oil pressure in Rebuild
 

rebuilt 5.7 long block with new oil pump i just finished getting the motor in the boat trying to prime the motor with the drill and i can't get any pressure on gauge to build....strange thing is if i take the oil filter off( remote oil filter atop riser) and turn the pump oil will flow slowly...its very weak flow tho...i can stop it with my finger easily and i really have to be high speed on the drill...what are some reason for this...could their be a loss of pressure somewhere or is this just a bad pump?

[QUOTE=formula18;3504365]rebuilt 5.7 long block with new oil pump i just finished getting the motor in the boat trying to prime the motor with the drill and i can't get any pressure on gauge to build....strange thing is if i take the oil filter off( remote oil filter atop riser) and turn the pump oil will flow slowly...its very weak flow tho...i can stop it with my finger easily and i really have to be high speed on the drill...what are some reason for this...could their be a loss of pressure somewhere or is this just a bad pump? where should i start

make sure you did not cross the oil lines 1st thing !! did that once and 0 pressure !

i never took them apart....i left them on the remote oil filter...i believe it only fits on one way? at least i think lol anything else?

If you installed a new oil pump you have to prime the oil pump itself with the oil your going to use before installing it.

Also your drill has to have enough rpms to spin the oil pump shaft also you need the proper oil pump priming tool that is the GM one, it will have a collar adaptor - just google GM oil priming tool to see. Good luck.

I had the same problem with my 502 not sure if you motor has them but the machine shop that did my work forgot to put the plugs back in the lifter gally after cleaning the block all the oil was pumping out into the lifter gally . hope this helps

i have the gm tool with the collar...

is your drill turning the right direction?

oil pressure
 

Sounds like somebody might of left out the lifter gallery plugs.It's the three in back of the cam gear. My 2 cents JOHN SR

+1

even if you didnt take them off the remote filter you might have swapped them on the block - swap them around and see.