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Henry Schmidt Henry Schmidt is online now
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Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 14,241
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Sealant placement and type is exactly how we have been sealing 911 cases for 7 years. I see no areas of concern here, although I would not glue the oil cooler seals. Previously we used Loctite 574 exclusively and we were experiencing unsatisfactory results as did the Porsche factory around that same time frame.
After hearing that new, factory built engine were failing at a rate of 4% before they ever left the dyno (new parts, factory techniques), we decided that new techniques were required.

Gluing the #8 main bearing was something we resisted for the longest time. When we rebuilt a few engines (even aluminum cases) with #8 main bearing leaks, we started measuring the journal. We discovered that most #8 main bearing journals were not round. O-ring function best in round cylinders. We have seen journals that measure .015" out of round. Because most companies don't aline bore the #8 bearing journal, most #8 journal won't seal properly without glue.
Trust the o-ring if you like but we don't.

As for 574 clogging engine parts, I have never seen that. The sealant that is notorious for clogging oil passages is silicone. (RTV). 574 is anaerobic so it only hardens in the absents of air so it is soft until then.
We have never seen an engine damaged by too much 574.
I have seen some engine build with huge amounts (MM) and still seen no negative effect from it.
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Henry Schmidt
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Old 09-04-2006, 09:24 AM
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