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Somatic Negative Optimist
Join Date: Mar 2002
Location: Winlaw, BC, Canada
Posts: 7,206
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What year/type is your car? Do you use the improved turbo covers for the bottom?
If you are absolutely sure that the mating surfaces were clean before you put the gaskets on, tighten the nuts a little more than 6 ft-lbs.
If it still leaks, drain the 2-3 liters out of the sump. Remove the cover.
To check the cover for warping, put a large sheet of fine sand paper on a sheet of glass and gently slide the cover over the sand paper.
Check the high points. Are the marks even?
When re-installing, snug the nuts up a little, then do the final torque from the center out.
I torque a little more than 6 ft-lbs; 8mm nuts can take a little more.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats. 
Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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