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Exhaust flange doughnut gasket continuous failure. Ideas why? 200

posted by  Volvodad on  Thu Aug 19 08:48 CST 2004
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last visit: Thu Oct 23 16:18 CST 2014
[RELATED]

Obviously someone in the past snapped off the stud and replaced it. Hmmmm...interesting. As long as the bolt is of a size that lets you put adequate torque on its nut (ie: about the same as the studs/nuts) it will do its job, which is to clamp the two flanges together. As long as the nuts are staying torqued and not coming loose from vibration or the heating-cooling cycles, your problem is elsewhere.

I'm going to guess it's a matter of misaligned flanges (the manifold is finished at the factory with a precise machine tool) or non-smooth flanges, or the exhaust system is not hung properly and is putting a stress on the flange joint which eventually causes the leak.
--
Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)






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