fuzzyjk

iTrader: (4)

No oil presure. Started the LS for the first time (29K mile transplant) with an oil gauge hooked up.....no presure. I found the gasket on the pickup tube was off and laying in the oil pan, put that back on and secured it. Tested again, still no pressure. Removed oil sending unit and nothing pumping. Pulled valve cover all lifters collapsed with no sign of oil. Pulled the pan again and pulled the main cap (bearings perfect) pulled one head, cylinders perfect. I pulled the front accessories to get to the oil pump, nothing out of the ordinary there either. I am at a loss. Were and why no oil presure. I got the oil pump to pump oil but is not getting to the top. What am I missing. Must be something stupid that I am over looking. I let the engine run for several mins to see if the pump needed to cycle, still no oil even after a good amount of time. What am I missing???

Need help, I am pulling what is left of my hair out.

Jim

badazz81z28

iTrader: (6)

Where did you get the engine? May be a previous issue (hence why it was pulled). How did you verify the pump was working?

"MAC"

iTrader: (1)

buy a new oil pump and see if that works

jrpimp00

iTrader: (17)

id rent/borrow/buy an oil primer and use that so you can see if there is a blockage or bad pump. This way you wont mess up the motor

fuzzyjk

iTrader: (4)

The engine cam from a wrecked vehicle. I saw and heard it run before it was pulled.

The oil filter is full of oil so it must be pumping something. I am guessing that it is a presure leak somewhere in the system, just have no idea where or if it is even possible.

Great idea on the prim pump.

What else could be causing this issue?

LilJayV10

iTrader: (39)

I wonder if one of the barbells has moved or leaking.

red fury

iTrader: (1)

The spring in the oil pump might be hung up in the open position, so at idle you are getting 0 pressure.

7beast

iTrader: (30)

this sounds like a good idea to check

fuzzyjk

iTrader: (4)

I will try the pressure relief spring.

Yes 0 pressure at idle.

fuzzyjk

iTrader: (4)

Problem solved after only 20 hours hunting loose ends. Defective oil pan gasket. Seems this engine had the truck oil pan swapped for a Corvette one. The pan and the riveted gasket were used when installed. Appearently when the person removed the pan from the Corvette, part of the gasket either broke off or was stuck to the block. This is the rectangular area on the left rear side where the oil goes down to the filter. This area was completely open to the oil pan. Oil flowed down the galley and right back into the pan. The only reason oil was in the filter was gravity.

On the bright side, the engine now has a 0 mile oil pump and a new fillter.

"MAC"

iTrader: (1)

LOL congrats and thanks for sharing ill def keep this in mind.