Maybe they were designed by an exhausted nut?

J.

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Joy Hecht
and Matilda, 1989 Burgundy Vanagon

For musings about life and the vanadventures:
http://users.rcn.com/jhecht/gypsy

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:::-----Original Message-----
:::From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
:::Of Jonathan Farrugia
:::Sent: Thursday, August 12, 2004 1:20 PM
:::To: vanagon@GERRY.VANAGON.COM
:::Subject: exhaust nuts
:::
:::so a week or so ago i had the chance to take apart a 1.9 wasserboxer
:::exhaust with the factory exhaust system on it.  or i assume it was since
:::the van is from arizona.  anyhow the exhaust nuts mounting the headers to
:::the heads were unlike any that i have seen before.  they are 13mm nuts
:::with what look like wound spring steel inserts inside them.  similar to
:::what a helicoil looks like.  if these are factory nuts are they still
:::available at the dealer or would the dealer hand me some regular nuts
:::with
:::a N part number?  additionally does anyone know why these nuts were made
:::like this?  i would guess something to do with the thermal expansion
:::differences between the aluminum head and the steel of the header and
:::stud.
:::
:::jonathan