blackLS1m6

iTrader: (14)

Getting frustrated and im out of ideas, the engine is a stock ls2 that has been rebuilt all new bearings, rings and oil pump. I have tried priming the engine and i still have no oil to the top of the engine or any oil pressure. Ive rebuilt a few ls engines and have never had this issue.

I know that the barbell restrictor is in, as well as the bypass plug next to the oil pump. The oil pickup tube and o-ring are in too. Im tempted to order the priming tool that melling sells and see if this will work. Really starting to think that the oil pump pressure relief valve is hanging up.

Anybody ever have a similar problem or any ideas? Thanks, in advance

Pete

Gray86hatch

iTrader: (83)

This is why cranking the engine over is not a good way of priming the engine.

Pressure lube is the only way to go.

For the bypass to hang open it would have to have more pressure than the spring is rated for and without the engine running this is not going to happen.

You don't need a melling tool just a cheap accumulator that you car fill with oil and put air pressure to it to push the oil in the engine.

Tim

litle88

iTrader: (20)

What kind of pump is it Pete?

blackLS1m6

iTrader: (14)

Thanks Tim, Im going to give that a try tomorrow. I know cranking the engine over is the worst way to do it. I thought that it may have been the oil pump because in my experience ive had this happen one time.

blackLS1m6

iTrader: (14)

Zeke its a new gm ls2 pump.

litle88

iTrader: (20)

Damn! Could it be a bad one?

blackLS1m6

iTrader: (14)

It's possible, I'm going to prime it today I'll let you know how it turns out.

Sales2@Texas-speed

iTrader: (5)

trying to prime it with the starter will not build pressure. When it was built, they should have thoroughly coated all the bearings, rings, valvetrain, etc with oil and/or assembly lube. That protection should be fine for a few seconds of running the engine. Start it and give it a few RPM, and then see how the pressure does.

midevil1

iTrader: (17)

My LS3 has 30psi when cranking over with plugs out...

Sales2@Texas-speed

iTrader: (5)

On the first start-up after a rebuild?

miami993c297

iTrader: (6)

First start-up of my rebuilt primed 418CI with melling, spark plugs off and injectors unplugged, 7 seconds on the starter and I had 40psi on the mechanical gauge and the one in the dashboard.

Christian

Sales2@Texas-speed

iTrader: (5)

That's very quick! We've watched for minutes at a time with the starter turning it over and see nothing....we even get calls daily where they are started/running and don't get oil to the top end to read on the gauge for 3+ minutes!

miami993c297

iTrader: (6)

Then something was certainly nicely done during the rebuild of my engine!!!

Christian

litle88

iTrader: (20)

Same here, I also have a melling with the h/p spring and on the second 10 burst the same way without plugs or fuel connected I had about 50 psi.