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ayglass ayglass is offline
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Join Date: Aug 2006
Location: Cleveland, Georgia
Posts: 149
Hey Nathan,

I looked at a 911 oil flow diagram last night and it appears that oil is only filtered on return to the tank from the engine. The turbo scavenge pump appears to return directly to the tank unfiltered. I felt around the bottom of my tank through the drain hole and found some carbon bits that look like the ones Dave recovered from his spray bar. I washed out the tank.

While it appears that gravity might separate this trash from the engine's oil supply most of the time, it obviously doesn't prevent this kind of failure. I would like to believe that the oil tank would be considered a "clean zone". I am going to pursue some kind of filter/screen on that scavenge pump return line. This appears to be a design weakness on the Turbo.
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Andy Glass
'86 930 Kokeln IC, K27-7200, SC cams, GHL headers, Fabspeed muffler, Short R&P , misc other mistakes made...

Last edited by ayglass; 10-06-2007 at 09:34 AM..
Old 10-06-2007, 08:19 AM
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