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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 05-09-2009, 01:31 PM   #1
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Default No oil pressure!! Oil flow schematic?

Ok, long story short, a guy traded motors and had it dissasembled/cleaned. He then put it back together with new bearings. Motor has no oil pressure. Brings it to me, i figure out he reused the oil pick up o ring and put a new one on. No dice. So i pull the filter and it shoots oil out, so oil is definatly getting that far.
It's not a bad oil pressure sensor, the sensor is bone dry.
So where does the oil go to after the filter? Anyone have a detailed schematic? I'm hoping there is an oil plug somewhere that got left out, cause i don't feel like pullin this motor out.
So far i have verified that the front oil plug (drivers side next to pump) is there and so is the oil diverter (barbell looking plug) is there too.
Any ideas?
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Old 05-09-2009, 06:01 PM   #2
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so the plug in the back on the block is in? is that the one your calling the barbell one?? i have ran into that problem before. i had pressure above 1500 and none at idle
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Old 05-09-2009, 08:24 PM   #3
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This diagram was posted in another thread by member Steve Bryant

Click the image to open in full size.
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Old 05-09-2009, 09:58 PM   #4
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If the barbell is not in the block, it will pump oil back into the pan.

Also try replacing the filter, its entirely possible (though unlikely) that the filter can be all round crap and blocking flow.

Only thing i can think of, if oil is going to the filter, and not reading pressure (feeds to the sensor gallery after the filter) either your sensor is bad, and there is actually pressure, or the barbell is not in the motor. Which means your transmission is coming out so you can get the rear cover off
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Old 05-10-2009, 12:17 AM   #5
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so the plug in the back on the block is in? is that the one your calling the barbell one?? i have ran into that problem before. i had pressure above 1500 and none at idle
Yup that's in there.
still no oil presure. I;m hoping it's not missing cam bearings or something.
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Old 05-10-2009, 07:34 AM   #6
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Are you sure the barbell was installed correctly? Just another idea to throw out there. The flat O ringed side should face the rear cover.
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Old 05-10-2009, 09:26 AM   #7
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Are you sure the barbell was installed correctly? Just another idea to throw out there. The flat O ringed side should face the rear cover.
Yup, I had actually assumed it wasn't in there and bought one when i bought the o ring. So i put in the new one. Still no oil pressure.
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Old 05-10-2009, 09:42 AM   #8
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I know you said you have it at the filter, but did you check the first oil galley plug in the block to the right of the pump to see if it's there? Mine wasn't. You can still get oil at the filter, just no real pressure to speak of.
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Old 05-10-2009, 10:54 AM   #9
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So far i have verified that the front oil plug (drivers side next to pump) is there
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I know you said you have it at the filter, but did you check the first oil galley plug in the block to the right of the pump to see if it's there? Mine wasn't. You can still get oil at the filter, just no real pressure to speak of.
yup, it's in there.
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Old 05-10-2009, 11:31 AM   #10
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Silly question, but have you checked the pickup tube?
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Old 05-11-2009, 05:10 AM   #11
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Were the cam bearings installed in the correct corresponding journals? We had a member here that had them in the wrong journals and some were walking out on him he had identical symptoms.
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Old 05-11-2009, 08:54 AM   #12
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Were the cam bearings installed in the correct corresponding journals? We had a member here that had them in the wrong journals and some were walking out on him he had identical symptoms.
Ok, pulled the moptor and noticed something weird. The oiling holes on all the cam bearing on the drivers side are all at about the 4 o'clock location but on the passenger side they are some at 8 o'clock and others at 10 o'clock. Which way are they supposed to be?
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Old 05-11-2009, 09:37 AM   #13
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I can't remember exactly where the oil hole were for the cam. All I know is I just made sure the holes matched up perfectly. Were the holes matched up on this motor?
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Old 05-11-2009, 10:47 AM   #14
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I can't remember exactly where the oil hole were for the cam. All I know is I just made sure the holes matched up perfectly. Were the holes matched up on this motor?
With all the internals still in it i could only see the first and last bearing. IIRC the front one looked to have both holes lined up but not the rear one. It looked to have only one hole lined up ( the driver side one was lined up). I'm assuming that all the bearings have to be installed with bot holes lining up and since all the passenger side hole don't line up, then a couple of the bearings were instaed up side down. But even if that is the case, that shouldn't affect the oil pressure right?
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Old 05-11-2009, 01:51 PM   #15
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I am the one who was having these same problems, and it ended up being a cam bearing walking foward.

No that would keep good pressure if the bearings were installed to where there oiling holes arent lined up with the ones in the block. If you are looking from te back of the motor, the cam bearing oiling hole should be at around 7-8 oclock. You have two oiling holes, and only one needs to be lined up. Also check your bearings to make sure they arent to far foward or back. If they are you should be able to see a gap where oil would bleed by the bearings.

Here is a pic of what it should NOT look like. Mine was on the very rear one so it was easy to see.
Click the image to open in full size.
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Old 05-13-2009, 12:37 AM   #16
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Figured out what was wrong. The one on the right is what was in the car. The one on the left is an extra i had laying around.
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Old 05-13-2009, 01:12 AM   #17
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I guess where the oil filter goes, was the problem?
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Old 05-13-2009, 05:06 AM   #18
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What is the pan gasket on the right for? Dry sump motor (LS7?)
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Old 05-13-2009, 08:59 AM   #19
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What is the pan gasket on the right for? Dry sump motor (LS7?)
No the asshat who put the motor together ripped the oil passage part of the gasket off.
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Old 05-13-2009, 11:33 AM   #20
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Why in the world would that *** clown that built the motor ever rip part of the gasket out? (not you SUX2BU)
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Old 05-13-2009, 11:33 AM
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