I too have seen the "heili-coil" nuts you describe and they do seem to work well over the years. I have used the 12mm copper nuts as well. I recently on my last two wbx rebuilds have switched to using some 8mm all thread in stainless steel with stainless lock washers and stainless nuts. I cutt the all thread to length and insert it into the head and use the stainless hardware with never seize and so far it seems to be working well. I recently had to replace the cat for smog and it was nice to not have to deal with the usual rusted frozen hardware. Stainless seems to work well. Doug
----- Original Message ----- From: "Jonathan Farrugia" <jfarrugi@UMICH.EDU> To: <vanagon@GERRY.VANAGON.COM> Sent: Thursday, August 12, 2004 3:20 AM 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 |
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