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Posted by: fixer34 Dec 25 2018, 07:31 PM

This has been happening for a long time, but seems to be getting worse. Factory -6, while it is running and for several days sitting there is no oil leakage (OK, maybe a few drops). Anything longer and I start to get a puddle under the passenger side of the engine to the point that I place a large foil pan under the car if I won't be starting/driving it for a while. After a couple months I might have 4 quarts of oil in the pan. I know it is from the dry sump backflowing into the engine, but I can't tell where it is leaking. It is missing the heat exchanger because I don't get the burnt oil smell when starting the car.
Thoughts on where might it be leaking and can it be fixed without pulling the engine?
I was thinking about one/both of the oil return tubes, but figured they would leak while it was running.

Posted by: euro911 Dec 25 2018, 08:32 PM

Rear main seal comes to mind.

I would lift the car off the ground enough to allow you to inspect the area in question. This is where having a lift really is a blessing.

Wipe everything you can reach to get it as clean as possible ... then watch to see where your leak is coming from.

To keep from wasting a lot of time laying under the car, having a good light source and a video camera that has an adjustable rate time-lapse mode aimed at where you think the leak may be coming from would be nice ... then you could review the 'footage' on your PC/laptop, etc. If not successful on the first go-around, you may need to move the camera around to record different areas, or at different angles, to really nail down the actual source.

Good luck

Posted by: flyer86d Dec 25 2018, 08:36 PM

I think that if the oil return tubes were the source, they would leak onto the heat exchangers. I have seen 911’s wet sump past the pulley end crankshaft seal. I have had good luck with the dealer supplied oil filter with the correct check valve not wet sumping.

Charlie

Posted by: euro911 Dec 25 2018, 10:33 PM

Another place to check would be the oil cooler seals. One of my old 911s developed a bad leak from there, but it was pretty much while the engine was running.

Posted by: rudedude Dec 26 2018, 01:54 PM

Valve cover? There is an anti siphon valve made to prevent tank from draining but I've never had an issue with my sixes doing what your describing.

Posted by: fixer34 Dec 26 2018, 04:50 PM

Thanks all. I'll poke around some more and see if I can spot something.
Lift? Yeah, it would be nice, but I'll settle for a heated garage right now...

Posted by: fixer34 Dec 26 2018, 04:51 PM

QUOTE(rudedude @ Dec 26 2018, 01:54 PM)

Posted by: rudedude Dec 26 2018, 08:05 PM

http://willhoit-auto-restoration.mybigcommerce.com/wr-anti-drain-back-valve-kit-for-65-71-911/