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Join Date: Dec 2006
Location: Idaho
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Oil Tank internals

I accidentally posted ths on the 911 side. I am looking at the differences internally in the 930 and SC oil tanks pertaining to the turbo scavenge pump return and oil separator return. Dose anyone know if the scavenge pump return fitting on the 930 tank is routed internally to the oil filter circuit in conjunction with the engine oil scavenge circuit? Also, is there any type of check valve on the oil separator return to the tank?

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Steve
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1983 3.4L 911SC turbo. Sold
Old 01-04-2010, 12:33 PM
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The turbo scavange line dumps exhaust aerated oil back into the tank unfiltered. Then it goes through an internal line to the top of the tank so the oil drops and passes through the perforated course screen baffles in the tank to seperate and break up the exhaust bubbles in the oil as much as possible.
I was curious about that and checked the turbo scavange line fitting on the tank with air pressure a couple years ago.

The oil seperator drains oil ,ist and condensation back to the tank by gravity.
The plastic connector between the 2 hoses from the oil seperator to the tank has no check valve and there is none in the tank.
Old 01-04-2010, 01:06 PM
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Thanks, that was very helpful.
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Steve
Sapere aude
1983 3.4L 911SC turbo. Sold
Old 01-04-2010, 05:10 PM
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