no oil pressure

[67racing]

just finished rebuilding my 98 gs-t engine. also installed a new oem oil pump, but i started the engine tonight, and the oil filter stays dry, no pressure whatsoever.
maybe someone can help! i would really appreciate it!

 

[blue1]

Did you prime you oil pump? put some light grease in on the gears if you haven't it will have trouble sucking up oil for the first time! You can take the oil filter back off and squirt heaps of oil into the the side hole of the oil filter mount flange or take out you oil pressure switch and pump oil into there!! you have to get oil onto the gears somehow so they will create a suction to draw the oil up the pick up. apart from that take your front cover back off and your timing belt and connect a drill on to the oil pump drive an spin it up like that! or you can if you have a compressor block your PCV off and pump air into the breather pipe in the back of the rocker cover and with your oil filter off it will start to push some oil out of there then you should be ok to put filter back on put oil in that as well as much as you can and then spin it on real quick. the compressed air pressurises the sump forcing oil up the pickup thru the gears in the pump and out the oil filter thus lubing the gears!! Good luck!

 

[67racing]

well, before i started it, i took out the plugs, put some oil in the pistons, disconected the injectors and cranked the engine for 5 seconds at a time a couple times. then i put everything on and started the engine. it first ran for 5 sec no oil pressure. so i turned it off. then triep it again for antother 10 seconds. still no pressure. don't you think that should have primed the pump?
thanks for your help!

 

[blue1]

No the motor cranks to slow and the oil pump is turning about 45% slower again to suck the oil up on a dry pump!!

 

[92redman]

You need to get oil in the pump before you can build pressure, it's simple as that. You probably never had a hand pump well, but do you know what happens if the pump runs dry? You better have a bucket of water to prime it or you will never create a partial vacuum capable of pulling the water out of the ground.

Same concept applies here. Take his suggestion and try pulling out the oil pressure sender and dump some oil in there. Then, with the mpi fuse pulled, crank for about 10 sec. If you don't get pressure crank again for 10sec. If you haven't started building pressure by now you didn't succeed in priming.

By the way, I would also fill the filter up with oil, that may help.

 

[rjgeier]

Take out the MPI fuse. Turn the car over until the oil light on the dash turns off.

 

[67racing]

thanks for your help guys, i really appreciate it. i'll try it tonight!

andreas