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Date:         Wed, 17 Jan 2007 15:58:53 -0600
Reply-To:     John Rodgers <inua@CHARTER.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Rodgers <inua@CHARTER.NET>
Subject:      Re: Warning! Do not use...
Comments: To: Geza Polony <gezapolony@SBCGLOBAL.NET>
In-Reply-To:  <vanagon%2007011712411248@GERRY.VANAGON.COM>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Geza Polony wrote: > stainless steel bolts on your muffler/catalytic converter. > > The more experienced among us know this already. I thought I'd beat the > corrosion problem by using M8 stainless bolts and nuts for my new Bus Depot > cat and muffler. Once they heat up, there's no way to loosen them. I don't > know what happens to the steel, but it sure isn't any labor saver. The heads > just break of when you crank them. So much for good intentions. > > > This may not relate, but on airplanes with piston engines, specially treated steel nuts are sometime used on exhaust studs OR special brass nuts are used. I think the nuts were more bronze than brass. In my experience the brass nuts were the nuts of choice, because experience taught that even the specially treated steel nuts could give trouble. Anti-seize was not used with brass nuts because they would be subject to backing off due to vibration. But the friction of the brass on the steel was sufficient to hold them in place, yet the brass was soft enough that when it came time to remove them they would turn loose of the stud they were mounted on. Sometime brass was left on the stud, but the stud would not be damaged. Far better to discard a brass nut, and clean the stud threads, than try to replace an exhaust stud - especially with the cylinder still on the engine and the engine in that airplane. It might be worth trying them on the WBX unless someone knows a specific reason why not to.

Regards,

John Rodgers 88 GL Driver


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