MRZ28

iTrader: (15)

I just installed a refreshed motor, with clevite race rod/main bearings, and im getting **** for oil pressure, I hooked up a mechanical pressure gauge to see if it was a electrical problem, and it red, 0 psi at idle and it jumps to about 25psi after 2K but doesn’t go past 30psi at any RPM. I have checked my oil Repeatedly for signs of a spun bearing, but it comes up clean every time. I have changed the oil, Oil filter, and oil pump, with no luck of oil pressure. I have also checked to O-ring if it was crimped. I called my machine shop and asked for the clearances of the main and rod bearings, and they were right on. I dont have any other ideas, and am very frustrated at this point, so any help or suggestions would be greatly appreciated.

Thanks

ls1muscle

iTrader: (16)

oil pickup tube o-ring?

killaz

i too am going to guess O ring.

MRZ28

iTrader: (15)

ya, I forgot to add that, I checked the O-ring also. its fine

MRZ28

iTrader: (15)

Ttt..

98LS-WON

Pressure regulator on the oil pump? Might need to add a few washers under the spring.

MRZ28

iTrader: (15)

what would cause that to happen, Ill try that next. Someone was telling me that when the machine shop hot tanked the block they may not have put back the oil plug that is in the back of the block, if that was the case wouldnt I have a leak?

MRZ28

iTrader: (15)

Bump for any help.

01350ss

iTrader: (18)

I was about to say the little valve/seal/plug on the back of the block. I would not run that motor any more.

MRZ28

iTrader: (15)

Alot of people have been saying that could be the problem, Im going to work on it tonight, and see if its in there. I hope thats the problem cause i really dont want to pull this engine again.

jay_99z

iTrader: (5)

There is also an oil plug on the front of the block......directly inline of the rear plug. The oil galley goes the whole way through.....

Here is one that might help. https://ls1tech.com/forums/generation-iii-internal-engine/513389-oil-pump-assembly.html

Or this one... https://ls1tech.com/forums/generation-iii-internal-engine/481722-important-there-oil-restrictor-barbell-restrictor-any-internal-oil-plug.html

racecar

If the plastic barbell shaped plug is not in the back of the block, you will not have any oil pressure. If they hot tanked the plug, it could be screwed up.
I had major problems and tried everything, finally realized that the oil pump pickup was sitting on the bottom of the oil pan. The bracket that attaches to the main cap can be easily bent and result in the pickup tube being too low. If you have main studs, they will space that bracket down.

MRZ28

iTrader: (15)

See, that sounds like my problem, cause at idle which is set at 1000 RPM, it has 0 PSI, when i rev to about 2k it will jump to about 20-25 psi.

ninobrn99

iTrader: (8)

who did u get the motor from?

SSDoubleK

iTrader: (100)

When I first changed my oil pump, I was reading over 40, today at Idle it stays around 30 a little lower maybe, and at a cruising gear of sixth it stays at 38, I still say mines to low, you might double check the O Ring.

MRZ28

iTrader: (15)

A local machine shop called Karios. I pulled the tranny today, and it Looks like they forgot to put back the rear oil plug/restrictor. Is Rear oil plug and the restrictor two different pieces, or it is one? Am i going to need a O ring when putting it back in?

01350ss

iTrader: (18)

you better hope that running that motor with no oil pressure at idle and very little pressure under light increased rpm/no load/light load didn't begin the breakdown process on the bearings. Eventhough you've repedetly checked the oil for signs of failure, that doesn't mean the damage has already been done. You may not see the damage for a little while yet.
Be aware!! I would seriously consider having that shop (or another) fully inspect all bearings for signs of premature wear.

jay_99z

iTrader: (5)

It's one piece. Part number 12558340 for the plug. Oring will come with it.