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-   -   Downpipe to main exhaust, studs or bolts? (http://forum.e46fanatics.com/showthread.php?t=947679)

Earendil 09-29-2012 08:11 PM

Downpipe to main exhaust, studs or bolts?
 
The other day I heard an exhaust leak. I lifted the car up to find with joy that it was the seal between the downpipe and the main pipe. See position of gasket at position 6 here. Great! Since I had removed the exhaust to do the clutch a few months ago, I figured it had just come loose. 1/8 turn on a wrench later and I'm holding half the bolt and nut in my hands. $***% :banghead:

So now the question, is the threaded end a bolt that can be replaced, or a stud that is part of the down pipe/cat assembly? It looks like the latter, but I pray to the budget gods that it isn't :(

Before I use a BFH, does anyone know or have advice?

Edit: the forum is changing the link, replacing the middle with "LINK-BLOCKED". I'll c/p it straight and hope that works.
http://bmwfans-LINK-BLOCKED-parts/ca...with_catalyst/
Edit2: wtf? Do we have something against BMWFan diagrams?

dmax 09-29-2012 08:56 PM

I'll brb with the diagram, but if I'm right it's a replaceable stud...which many have had some wrestling matches with...and which although is a $20 bolt or something stupid like that, many have found cheaper alternatives.

Search me, incolnel, and GoingNuts

BRB...


#5, 6 (gasket) and 7 is what you need. Confirm on your car by entering your vin, but I'm sure it's the same.

You'll see only the nut listed if you search exhaust only.

http://realoem.com/bmw/diagrams/e/h/24.png

mkodama 09-29-2012 08:58 PM

It's a replaceable stud, easy to order from the dealership or a site sponsor.

tehcbass 09-29-2012 09:02 PM

link doesn't work bro..

im 100% positive its not that hard to find.. ill try and find one real quick. no promises

Earendil 09-29-2012 09:53 PM

Quote:

Originally Posted by dmax (Post 14773905)
I'll brb with the diagram, but if I'm right it's a replaceable stud...which many have had some wrestling matches with...and which although is a $20 bolt or something stupid like that, many have found cheaper alternatives.

Search me, incolnel, and GoingNuts

BRB...


#5, 6 (gasket) and 7 is what you need. Confirm on your car by entering your vin, but I'm sure it's the same.

You'll see only the nut listed if you search exhaust only.

http://realoem.com/bmw/diagrams/e/h/24.png

The problem is that #6 there is a hex head, which mine do not have. Mine are flat heads with a notch that prevents them from spinning. It's also not clear where that hex bolt is supposed to go by looking at that diagram. I searched by vin and I get the same diagram. Maybe I'll just take a BFH to it and see if I can get it to pop out despite the rust. If so I can try to thread and length match it.

mkodama 09-30-2012 02:10 PM

Quote:

Originally Posted by Earendil (Post 14774006)
The problem is that #6 there is a hex head, which mine do not have. Mine are flat heads with a notch that prevents them from spinning. It's also not clear where that hex bolt is supposed to go by looking at that diagram. I searched by vin and I get the same diagram. Maybe I'll just take a BFH to it and see if I can get it to pop out despite the rust. If so I can try to thread and length match it.

I should have been more precise with my previous post. The stud is pressed in place, so if it fails, you have to knock it out. The BMW replacement is a hex head bolt with some very unique dimensions to line up in the exhaust manifold where the stud used to be. The replacement part is not a direct replacement, but more of a factory designed repair solution.

Earendil 09-30-2012 02:53 PM

Quote:

Originally Posted by mkodama (Post 14775074)
I should have been more precise with my previous post. The stud is pressed in place, so if it fails, you have to knock it out. The BMW replacement is a hex head bolt with some very unique dimensions to line up in the exhaust manifold where the stud used to be. The replacement part is not a direct replacement, but more of a factory designed repair solution.

Wonderful info! Looks like Pelican sells the bolt for $25, which is a damn expensive bolt! But at least I know it's been designed for that application. Thanks for the information!

dmax 09-30-2012 03:14 PM

realoem lists that bolt for $22 or so, which usually means you can find it at dealer for about that cost or online for about 40% less.

Try bmaparts.com bavauto.com and search the 'incolnel' bolt thread...there was a big fight...many just use good grade bolts...not sure how good an idea that is, but in the scheme of things, could be worse!


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