[Vwdiesel] Broken Exhaust Studs
Val Christian
val at swamps.roc.ny.us
Mon Aug 9 09:29:29 EDT 2004
The story I hear is to use brass nuts. In fact the last set of exhaust
retainer bolts, springs and nuts I got had steel and brass nuts in the
kit.
For high temp, you need the right SS. I can't tell you what grade.
More common SS (304 or 305??) gets to soft and gummy.
Good luck.
Val
>
> The Vanagon diesel uses studs/nuts from the exhaust manifold to the
> first exhaust pipe instead of those spring clip things they use on the
> cars. 3 of the four of mine are broke. Took the manifold off yesterday
> and the three broken ones still have enough nubby's on them to get a
> vice grip on, so they're busy soaking in Liquid Wrench for the next few
> days... the fourth came right out with the stud attached - woo hoo!!
>
> A few questions as I'm reassembling: The First exhaust pipe is bolted
> to the manifold, then it makes a few turns and is attached to the
> muffler which runs longitudinally along the back of the van on it's
> hangers. The whole system is bolted together and must vibrate / flex as
> a unit - is there some type of flex pipe that I should have welded in
> there to save stress on these exhaust studs? I assume mine broke
> because they were 23 yrs old and corroded to crap, but may have lasted
> longer without the whole deal vibrating as one unit?
>
> Secondly - This is really the first exhaust work I've done - is there a
> special kind of material that the nut on the exhaust stud should be made
> of to prevent some of this corrosion? Should I use stainless steel nuts
> or is there something better?
>
> Thanks,
>
> Chris
>
>
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