Exhaust manifold stud question

[halboyles]

2 minutes ago, Scottjeffrey said:

Are the head studs a different part number than those for the downpipes.

Yes, and the downpipe attaching studs are M10 while the head studs are M8.

[Scottjeffrey]

• 

 

BMW Stud Bolt (M8X28Zn)(M3 M5 M6) - Genuine BMW 07119908368

1600, 1602, 2002, 2002tii, 2500, 2800, 2800CS, & more

 

Part #: 

BMW-07119908368

 

 

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Price each:	$1.41

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Edited May 8, 2019 by Scottjeffrey

[TobyB]

I think that's about what Ace wants, so I'm not saving you any money...

 

t

same day delivery, tho

[flagoworld]

But I don't think you want to get the zinc plated ones for the exhaust studs. You'll probably just burn off the zinc and die a slow, painful death.

 

The exhaust studs are black... painted or something? Not really sure what makes them black. They don't have much of to protect them, so they rust easily with the heat cycles.. which, if I am not mistaken, is why they use copper nuts and anti-seize to hold the manifold on. The 4 under the manifold are a bit of a pain to get at when they get stuck...

 

My local ACE also sells various sizes of them, as "exhaust studs" if i remember correctly.

Edited May 10, 2019 by flagoworld

[ray_]

7 hours ago, flagoworld said:

But I don't think you want to get the zinc plated ones for the exhaust studs. You'll probably just burn off the zinc and die a slow, painful death.

 

The exhaust studs are black... painted or something? Not really sure what makes them black. They don't have much of to protect them, so they rust easily with the heat cycles.. which, if I am not mistaken, is why they use copper nuts and anti-seize to hold the manifold on. The 4 under the manifold are a bit of a pain to get at when they get stuck...

 

My local ACE also sells various sizes of them, as "exhaust studs" if i remember correctly.

 

 

Maybe.

 

But the nuts aren't copper.

 

['76mintgrün'02]

and the black studs aren't painted, the finish is called black oxide.

it provides mild corrosion resistance.

 

 

[flagoworld]

1 hour ago, ray_ said:

 

 

Maybe.

 

But the nuts aren't copper.

 

 

 

https://blunttech.com/products/12614890

 

Are they just copper plated? They felt fully copper when I put them on though.

 

Either way, my nuts are definitely copper.  

 

 

39 minutes ago, '76mintgrün'02 said:

and the black studs aren't painted, the finish is called black oxide.

it provides mild corrosion resistance.

 

 

 

Ah, right! Could not for the life of me remember what was on them. Same coating on impact sockets, right? Seems to dissuade corrosion for a little bit, but those heat cycles..... Bring out the rust in me.

['76mintgrün'02]

copper nuts would be too soft.

they are copper plated.

[Hans]

I'd be very careful attacking the stud holes in the head with a thread making tap. Better to find a thread cleaner. Its very easy to screw up the threads with a real tap.

[02Pilot]

It's been a very long time, and my brain is addled beyond recognition at this point, but I seem to recall an interchange with a Saturn (L-series?) exhaust stud that had an internal hex recess on it that made installation and removal much easier. I'll certainly be trying to track them down when I have occasion to replace mine - I hate fussing with stud removers.

[jimk]

1 hour ago, ray_ said:

But the nuts aren't copper.

You stole my thunder!

[ray_]

36 minutes ago, jimk said:

You stole my thunder!

 

 

I stole from you!

 

Ryan, put a magnet on one of your copper nuts.

 

?

[tech71]

Stupid 10x25 studs & nuts  that hold on the downpipe! Been soaking them in mouse milk for days in prep for removal. Todays the day and they are not having it.

Had to give up on that plan and take off the Exhaust manifold & downpipe together.

Then I had to go to town to get a new drain valve for my compressor, guess where?

Yup, 5 bucks at Ace, they had studs as well but not 8.

And by the way... copper smopper! wish I could get my hands on some stainless steel hi temp metric locknuts.

Edited May 10, 2019 by tech71
more sniveling

[flagoworld]

7 hours ago, ray_ said:

 

 

I stole from you!

 

Ryan, put a magnet on one of your copper nuts.

 

?

 

That would hurt the mini-me’s!!! ?

 

Magnets are dangerous!

[tech71]

Guess its a good thing I had to remove my downpipe and exhaust manifold as a unit or I would never have seen the big crack in the manifold under the heat shield.

Anyone have a manifold they can part with?