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Help, low oil pressure in new swap

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Old 03-23-2011, 08:35 PM   #1
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Default Help, low oil pressure in new swap

Ok, so I've been working over the winter to swap a '06 LS2 from a Trailblazer SS into my '67 Firebird.

I just started it up last Saturday and have around 40PSI when the oil is cold but drop to 0 psi when it warms up.

What I do wrong, or is the motor/oil pump toast?

I'm running a RetroLSX oil pan, and Mobil 1 5W30 synthetic.

If I didn't get the o ring on the pick up tube seated correctly would this be the result?

I didn't remove the front or rear covers and I have no leaks anywhere.

I'm not sure how long the motor sat before I got it but suppose to have around 50K miles. Everything looked good when I had the pan and heads off.

So I emptied the oil, looked ok. so I put new oil back in and put about 6 ounces of seafoam in the oil. ran it for a bit and can see about 14 psi at idle but still drops to zero after a bit of idling.

Gonna try again tomorrow to run it, then gonna change the oil to 10W30 and see what the pressure is like. If that don't help then I'm gonna start with pulling the pan.

Any help or ideas ?
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Old 03-23-2011, 09:13 PM   #2
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The most common cause of no oil pressure is the pickup o-ring. Sounds like a great place to start to me.
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Old 03-23-2011, 09:30 PM   #3
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+1 on the most common problem is the O-Ring, pinched, or the wrong sized one.

The second one would be that the pickup is not seated correctly. Did you check the pickup and bottom of oil pan clearance ?.. mine had about 3/4" between the bottom and the pickup.

Did you take anything else apart..the Oil Gallery plugs ? Check you oil filter, replace it.

Good luck..

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Old 03-24-2011, 06:46 AM   #4
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Make sure your gauge is accurate.
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Old 03-24-2011, 07:06 AM   #5
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Exactly^^^^^^^^!!!
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Old 03-24-2011, 07:42 AM   #6
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I pretty sure the gauge is accurate, they are new Dakota Digital VHX series. and secondly I can "hear" the loss of oil pressure, the valve train gets lound and pitons sound like they're knocking.
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Old 03-24-2011, 07:49 AM   #7
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I would check pick up and if not buy a new pump.
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Old 03-24-2011, 08:17 AM   #8
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I did the same thing in my hybrid hot rod. At an idle, it had 0 oil pressure when it was warm. I had to pull the engine back out. I installed a new oil pump O-ring and it was good to go. Make sure you get the right O-ring for your application. GM had different ones for different applications.
They are color coded for a reason, like stated above, if the pickup tube has a recessed area where the o-ring goes you need the thicker RED o-ring. The trucks use this design.

GM Oil Pick-Up Tube O-Ring (1st Design)
12557752

BLUE SEAL
Specifics:

* Oil Pick-Up Tube O-Ring ea.
* Chevy/GMC Pick-Up (1999-2000 LS V8) 1st design
* F-Body (1998-2002)
* Cadillac CTS-V (2004-2007)
* Corvette (1997-2008)
* Thickness = 3.55mm (0.140")
ID = 23.60mm (0.930")



GM Oil Pick-Up Tube O-Ring (2nd Design)
12584922

RED SEAL
Specifics:

* Oil Pick-Up Tube O-Ring ea.
* Chevy/GMC Pick-Up (1999-2000 LS V8 engines with 2nd design pick-up tube)
* Trailblazer (2003-2008 With LS V8 engine)
* Hummer H2 (2003-2008)
* Hummer H3 (2008 With LS V8 engine)
* Chevy/GMC Pick-Up (2001-2008 LS V8 engines)
* W- Body (2006-2008 With LS V8 engine - Impala, Lacrosse, Grand Prix)
* Thickness = 4.20mm (0.165")
ID = 20.69mm (0.815")
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Old 03-24-2011, 08:22 AM   #9
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My muscle car oil pan cam with with three a black,green and red o-ring the red one was already on the pick up tube.
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Old 03-24-2011, 10:14 AM   #10
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Nice post ... That explains my problem as well ... had 60 psi when i first started my new motor

now its at 0.... i got the new blue ones i though were a upgrade from red....

they did fit kinda loose so i put 2 blue ones and it seemed good but i guess not


I will try the red ones now
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Old 03-24-2011, 02:53 PM   #11
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You guys might want to check in the the BRP oil pump/pickup Gridle.. great piece.. ! Cheap insurance.. !

http://www.brphotrods.com/mm5/mercha...gory_Code=CNV1
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Old 03-24-2011, 03:09 PM   #12
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You can also use just a 2nd bolt with a large washer on it to catch the other side of the tube. That's what I did, but I'll only know if it worked when I start the engine!
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Old 03-24-2011, 04:49 PM   #13
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Which o-ring is the right one with the RetroLSX pick up tube?

I just used the one that cam with the pan.

Looks like the motor is coming back out.
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Old 03-24-2011, 05:00 PM   #14
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I run a small bolt and nut through the hole that is there and so far it's held.
Quote:
Originally Posted by 82lsx cutlass View Post
My muscle car oil pan cam with with three a black,green and red o-ring the red one was already on the pick up tube.
Mine came with just one..it was from the dealership too.
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Old 03-24-2011, 09:02 PM   #15
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This might be a waste of time, but I think I'm going to try to lift the motor enough the get the oil pan out of the way and see if I can check/replace the o ring without pulling the motor. If not out comes the motor and I think I'll go ahead and replace the pump while it's out, even though I think it's ok. Cheap ($185) insurance.

Here's a dumb question...Is there a right or better way to install the o ring and pick up tube to make sure it's done right...the second time? LOL
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Old 03-24-2011, 09:08 PM   #16
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what color is the o-ring that came with ur pick up magntik?
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Old 03-24-2011, 09:10 PM   #17
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Just make sure it's the correct size and seated properly.

I think your pump is fine.
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Old 03-24-2011, 09:13 PM   #18
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i would do the same.
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Old 03-24-2011, 09:20 PM   #19
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Quote:
Originally Posted by 82lsx cutlass View Post
what color is the o-ring that came with ur pick up magntik?
I don't remember what the color was. I have learned a lot since I started this in November, and I really didn't pay that much attention to it. It came with the RetroLSX kit and I used it. Sad thing is I already sold the Trailblazer SS pan and pick-up so I can even check what was in it.

Quote:
Originally Posted by the_merv View Post
Just make sure it's the correct size and seated properly.
I do I figure that out?
Do I buy one for the Trailblazer SS pump, or the RetroLSX pick up???

Any tips to make sure it's seated properly?
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Old 03-24-2011, 09:40 PM   #20
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try it and im pretty sure it going to be a red o-ring thats what came on my 6.0 and it cam out of a 2500.
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