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> Anyone have photos of a -6 oil tank that's been cut open?...
Detroit
post Jul 13 2024, 12:00 PM
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So, I've just rebuilt a 911SC motor to put into my car. It's mounted in a start cart, and to cut a long story short, it has no oil pressure due to no oil coming out of the tank.
It sounds like a kazoo if I blow into that fitting, but I cannot suck anything out of it. I'd have thought that that fitting would open straight into the volume of the tank, but maybe there's a pipe in there that's collapsed?...
Anyway, I'd like to understand exactly what it looks like there before doing anything drastic... This is, incidentally, a factory -6 tank.
Thanks very much in advance!

@mb911 Ben, I'm tagging you, because I figure if anyone on this site has cut a tank open, it'd be you...
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brant
post Jul 13 2024, 12:20 PM
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There are pictures in an old thread on this board
I don’t have a link unfortunately
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Detroit
post Jul 13 2024, 12:28 PM
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Yeah, Brant, I'm pretty sure I've seen those, but my searches have come up empty... I'm sure someone will be able to help.
Thanks.
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Superhawk996
post Jul 13 2024, 12:43 PM
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Oh man - sorry to hear you’re having trouble.

See post 211 for internals of Ben’s tank as a generalization. This was a DIY tank I did so I’m sure Ben’s is far better welding and probably slightly different execution but this was also done with Ben’s oversight so shouldn’t be too different.

Fitting in bottom of tank is direct to the tank volume.

http://www.914world.com/bbs2/index.php?sho...5209&st=200

@mb911
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Detroit
post Jul 13 2024, 12:49 PM
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Thanks, Phil. I'll get it sorted..
In fact, another thought just occurred to me. I might just have been stupid enough to get the inlet and outlet on the tank mixed up. The shop manual suggests the fitting on the side of the tank is the feed to the pressure pump. That, of course, would make the other the line from the scavenge side of the pump. Do I have that right?...
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mb911
post Jul 13 2024, 12:49 PM
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No oil coming from the bottom? That should not be blocked in anyway. There is no plumbing to that area just the return on the filter console side. You hooked it up right? As in bottom of tank goes to engine cooler area and the bottom of the engine(123 side) goes to side of the tank where the filter console is
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mb911
post Jul 13 2024, 12:51 PM
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Pictures of what you have would be ideal
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Superhawk996
post Jul 13 2024, 12:52 PM
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Here is the drawing of the internals

Post#4
http://www.914world.com/bbs2/index.php?sho...c=45335&hl=Attached Image
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Superhawk996
post Jul 13 2024, 12:57 PM
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Plumbing diagram from Bird

https://forums.pelicanparts.com/porsche-911...ne-vs-tank.html



Attached thumbnail(s)
Attached Image
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Superhawk996
post Jul 13 2024, 12:59 PM
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QUOTE(Detroit @ Jul 13 2024, 02:49 PM) *

In fact, another thought just occurred to me. I might just have been stupid enough to get the inlet and outlet on the tank mixed up. The shop manual suggests the fitting on the side of the tank is the feed to the pressure pump. That, of course, would make the other the line from the scavenge side of the pump. Do I have that right?...

Yeah I think you have them reversed. Bottom of tank feeds the pressure pump
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Detroit
post Jul 13 2024, 01:02 PM
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Doh!... I had it bloody backwards.
I have to concede... It didn't make sense to me, but the factory manual sure looks to have it the other way around. I don't know why I didn't ask before hooking it all up...

Thanks, fellas!!!
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mb911
post Jul 13 2024, 01:21 PM
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QUOTE(Detroit @ Jul 13 2024, 11:02 AM) *

Doh!... I had it bloody backwards.
I have to concede... It didn't make sense to me, but the factory manual sure looks to have it the other way around. I don't know why I didn't ask before hooking it all up...

Thanks, fellas!!!



I hope no damage was done
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NARP74
post Jul 13 2024, 01:49 PM
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Good luck! This is scary
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Detroit
post Jul 13 2024, 01:55 PM
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I've got oil pressure.
It should be noted that I never started the engine. I spun it with the starter and no spark plugs. And not for long at that.
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mb911
post Jul 13 2024, 02:12 PM
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QUOTE(Detroit @ Jul 13 2024, 11:55 AM) *

I've got oil pressure.
It should be noted that I never started the engine. I spun it with the starter and no spark plugs. And not for long at that.


Should be good then
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fixer34
post Jul 13 2024, 03:43 PM
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QUOTE(Superhawk996 @ Jul 13 2024, 01:57 PM) *

Plumbing diagram from Bird

https://forums.pelicanparts.com/porsche-911...ne-vs-tank.html


I saw this diagram on another thread and have a question. This shows the pressure relief valve exit as going to the pressure pump input and gravity/suction feed pipe on the tank. Shouldn't it be going to the tank return line?
This would REALLY mess up a check valve on the supply line..
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Detroit
post Jul 13 2024, 04:51 PM
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My interpretation of that schematic is this.
The safety valve is there to prevent over pressurization of the system. Pressure gets too high, the valve opens and dumps the oil to the crankcase. The problem with that is inconsistent oil pressure as the engine will momentarily see "no" oil pressure. The second valve modulates the oil pressure. When it opens some of the pressure escapes back to the tank, but some of it is going to the suction side of the pressure pump alleviating the drop on the pressure side...
If you sent it all back to the tank it'd be no different than dumping into the case.
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