CoBy Williams

Just got back my freshly rebuilt Ls2, ALL new bearing, block was honed and cleaned ect. Long story short we got the Ls2 in my Fbody, and the first crank it made 60psi of oil pressure cold start. Drove the car for one day and once normal temp was reached it went down to 40psi cruising (which is normal to me). Day two cranked the car, cold start pressure wasnt as strong but above 40psi, i just figured maybe because it was warm that day. I was headed to the muffler shop and the oil pressure GRADUALLY started to dip till the gauge read zero. I immediately cut the car off. Popped the valve cover off and its not oiling up top what so ever, lifter are DRY. Took off the oil filter and turned the motor over and NO oil came out. (new oil pickup tube Oring, new mellings pump,) WHAT COULD THE PROBLEM BE??? I just wanna be able to DD my car and drag a ford here and there.

S10xGN

iTrader: (11)

How much oil was in it? How much is in it now?

KCS

iTrader: (20)

Cut open the filter and look for bearing material in the filter element.

CAMSTER

iTrader: (10)

Take the gas pump fuse off so it won't start take oil filter off and crank the motor see if you get oil pumping out from filter location likely you will, install a new filter of different brand.

A.R. Shale Targa

iTrader: (2)

I've seen plenty of fresh engines have these same symptoms and culprit has been a collapsed oil filter.

CoBy Williams

I used a K&N filter , cut it open and it looked fine. The oil is full and when I turned the motor over just yesterday NOTHING came out???? Only the oil that was sitting in the filter itself came out and that's it. I'm really wonder what could cause for me to have oil pressure one day and for it to decrease the next after after a fresh build??? I dont get it and never experienced something like this.

A.R. Shale Targa

iTrader: (2)

oil pump pickup tube O ring got rolled or slightly torn
cam retainer plate not sealing properly......

brandon6.0

iTrader: (32)

If it were me a would drain oil and measure the amount left over. If that checks out good thin i would check pump and pickup. Did u run a double chain by chance?

CoBy Williams

I just checked the Oring and it was fine this time, I did pinch the last one. I didn't check the retainer plate, I know the pump.is fine, I tried bit my new Mellings pump and my stock ported pump. Still no pressure, ill.check the tube next I guess, I'm not running a double chain.

CAMSTER

iTrader: (10)

If you turned the motor without filter and no oil was pumped your next step involves removing the timing cover to inspect the oil pump, it may have rupture.

brandon6.0

iTrader: (32)

Or the oil pump bypass valve could have messed up and not letting oil flow through engine.

Ive heard of them going bad. And guys have shimmed them up to increase pressure to. Worth a checking.

allblowdup

Yup ahve seen the bypass valve in the oil pump get stuck more than once with a new engine.

ls1jorge

iTrader: (5)

Same thing happened to my Ls1 after cam swap lost oil pressure after driving car for a month, turned out to be pinched o ring, drove the car atleast 500 miles till oil pressure drop.

CAMSTER

iTrader: (10)

Any update.

CoBy Williams

We used a new Oring, come to find out the red one was the one we were supposed to use, but STILL we turned it over after only putting the front cover back on and no oil filter. Turned it over and NO oil came out after seconds of holding it. So we put the filter on and turned it over again and the oil gauge only flinched while turning it over for 10sec straight but remained on 0psiand never built up any kind of pressure. Checked the plug by the oil pump and it was in also.And we poured oil in the pump before we put it on and turned the gears and oil shot out. So I'm sure the pump is fine. Its a brand new Mellings pump. So I'm guessing I need to check the oil by pass valve on the back of the block? The machine shop installed a ls1oil by pass valve on the back of the block but it wont hurt to check it after my options are dwindling down now.

CoBy Williams

The gauge should show SOME KIND of oil pressure right while the motor is just being turned over?

brandon6.0

iTrader: (32)

Yes i bet its the barbell plug in the rear. Without that it will have no.oil pressure. Also a bad cam bearing. Pull cam and check

CAMSTER

iTrader: (10)

Will pump as it turns but pressure will read after it starts, still wonder if you removed the oil filter and crank the motor to see if it pumps oil straight out the filter area.

CoBy Williams

Ok will I will check that plug next, and last night it didn't spill out the filter area while turning it over, and no oil reached the lifters while the was valve cover was off. So I should try to start it to see will the gauge read?

CAMSTER

iTrader: (10)

When the oil filter is removed if you crank the motor it should gush oil out immediately true the filter threaded stud which is like hollow pipe with threads outside for the filter, no need to start it until you know there's oil lubricating that poppy.