quiet_storm98

iTrader: (48)

my motor was recently put together and it fired up with no problem and after letting the cam break in for a while the car was shut off. When the car was restarted suddenly it lost oil pressure and when the valve cover was removed there was no oil at the top end of the motor so obviously no oil was going through the motor. At first the oil pump was thought to have been the problem so my stock one was put back in but once again when it was started it had no oil pressure. So now we are trying to figure out what the problem is. The guy doing the install says he believes the plunger at the back of the block may have been removed and thats why the oil pressure suddenly dropped, does anyone have any ideas on what it could be??

LS1-450

iTrader: (33)

That's a good place to start. Also, could be the plug @ the front end of that same oil galley. Most likely the rear plunger.

quiet_storm98

iTrader: (48)

i hope that is what it is since it is somewhat of an easy fix

eamador11

check for pinched oilpump O-ring or even worse...ripped o-ring

quiet_storm98

iTrader: (48)

if that was the case wouldn't it have worked once i put my stock one back in?? Also the one that was put in and then taken out the o-ring was fine

quiet_storm98

iTrader: (48)

anybody else got any thoughts on what it could be??

quiet_storm98

iTrader: (48)

anyone??

chuckyt1

iTrader: (33)

When you replaced the oil pump, did you pull out the O ring? I pulled my oil pan last week and, when I removed the pickup tube, I could not believe how bad the o ring looked. It was split and pulled down on the tube on the backside. Would have looked fine from the front. Car still made about 40 psi at cold idle. If the plunger was left out I don't think you would have made psi at all.

quiet_storm98

iTrader: (48)

well he pulled the first pump and it was fine and then put in my stock one to see if the new one was faulty so honestly i doubt it is the oil pump considering we tried 2 different pumps

quiet_storm98

iTrader: (48)

any other suggestions?

jpeach

iTrader: (1)

Is it a stroker? I've heard of people spacing the windage tray and bottoming out their pickup tube.

quiet_storm98

iTrader: (48)

nope..it is a 347

prplhaz

How about a bad oil pressure sending unit or the guage.....................

camaro6668

We'll let me tell you I was TRIPPING on the same problem when I first started MY new motor also. Had the motor running for 3-4 5 min intervals and still had no oil in the heads! I pulled the sender and checked my oil pressure, sure enough it was fine, but still no oil in the heads! Turns out gen 3 motors rought the oil through the oil cooler BEFORE cam bearings, pushrods, cyl heads! To sum it up I ran the car at 2500 for about 10m and FINALLY oil started coming out of the pushrods. I was TRIPPING the whole time but sure enough thats what it was... Maybe I used too much assembly lube? but wahtever, Check your oil pressure at the sender!
PEACE

quiet_storm98

iTrader: (48)

ok thanks for the advice but the weird thing is at first it had oil pressure then after it was ran for a while that is when the oil pressure dropped

LARRY01Z28

iTrader: (28)

. the oil gallery plug was left out.
now we started the motor and we have pressure. but only 25 psi??

im gettign ready to call you jarrad.

quiet_storm98

iTrader: (48)

thanks man..im happy you were able to figure out the problem

Steve Bryant

iTrader: (1)

Take a look at this thread https://ls1tech.com/forums/generation-iii-internal-engine/774926-help-no-oil-pressure-new-motor.html. Also, when you have a problem, try using Search First. There are very few topics that haven't been covered multiple times and search is working extremely well now.

Steve

I wish you the best in solving the problem.

Deeavi

iTrader: (16)

Make sure you get the correct NEW o-ring for the oil pump to pickup tube. I believe that is where most of these problems originate.

quiet_storm98

iTrader: (48)

thanks for the link...very interesting