Snapped one of the bolts between the factory header and the mid pipe. How to replace?

Obioban · 01-03-2016, 06:23 PM

Part #5 in the diagram above, in my wife's 2009 e91 LCI (replacing the clutch).

When unscrewing one of the nuts that clamps the mids to the header, one of the bolts (#5) sheered.

However, I have no idea how to get the bolt out of the header to replace it...? I'v applied heat, cold, penetrating fluid, hammered on it-- nothing seems to be touching it. I'm not comfortable really wailing on it because it attaches to the factory aluminum head...

Anyone have any tips for getting that stud out without damaging anything?

Miller335 · 01-03-2016, 06:38 PM

You're probably going to have to drill it out at this point.

Obioban · 01-03-2016, 06:42 PM

Quote:

Originally Posted by Miller335

You're probably going to have to drill it out at this point.

Uggggh, yeah...

Maybe it's time for headers

Efthreeoh · 01-03-2016, 07:49 PM

No drilling needed. Just cut the stud flush with the flange. Then take a ball peen hammer and a correctly sized punch and knock it out. Obviously it knocks though from back to front. Hammer the shit out of it, you'll not hurt anything. If you know anyone with a air hammer and portable air compressor call them to come over, the air hammer will knock it out in two seconds. The new stud just pops in.

kiel_dafo_kenyg_as · 01-04-2016, 02:18 AM

Problem is: the design is elastic. You need a counterweight (a second hammer) that is held to the flange when the hammer hits the bolt. This way the impact will move the bolt instead of beeing absorbed in the pipe construct.

01-03-2016, 06:23 PM	#1
Obioban Emperor 1614 Rep 2,753 Posts Drives: M3, M3, M5, M5 Join Date: Apr 2008 Location: West Chester, PA iTrader: (0) Garage List 2008 BMW M5 [0.00] 2017 BMW i3 [0.00] 2005 BMW M3 Coupe [0.00] 2001 BMW M5 [0.00]	Snapped one of the bolts between the factory header and the mid pipe. How to replace? Part #5 in the diagram above, in my wife's 2009 e91 LCI (replacing the clutch). When unscrewing one of the nuts that clamps the mids to the header, one of the bolts (#5) sheered. However, I have no idea how to get the bolt out of the header to replace it...? I'v applied heat, cold, penetrating fluid, hammered on it-- nothing seems to be touching it. I'm not comfortable really wailing on it because it attaches to the factory aluminum head... Anyone have any tips for getting that stud out without damaging anything? __________________ 2005 M3 Coupe, 2004 M3 Wagon, 2001 M5 Sedan, 2008 M5 6MT Sedan, 2012 128i M sport
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01-03-2016, 06:38 PM	#2
Miller335 Colonel 291 Rep 2,189 Posts Drives: 2007 E92 Join Date: Oct 2013 Location: Portland, OR iTrader: (0)	You're probably going to have to drill it out at this point. __________________ 2007 E92 335 6MT w/335is clutch FBO MHD E60 Wedge map 49k miles
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01-03-2016, 07:49 PM	#4
Efthreeoh General 17438 Rep 18,806 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	No drilling needed. Just cut the stud flush with the flange. Then take a ball peen hammer and a correctly sized punch and knock it out. Obviously it knocks though from back to front. Hammer the shit out of it, you'll not hurt anything. If you know anyone with a air hammer and portable air compressor call them to come over, the air hammer will knock it out in two seconds. The new stud just pops in. __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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01-04-2016, 02:18 AM	#5
kiel_dafo_kenyg_as DIE ANTWOORD 68 Rep 640 Posts Drives: 335d E92 Join Date: Jul 2014 Location: Bimmer's home - Bavaria iTrader: (0)	Problem is: the design is elastic. You need a counterweight (a second hammer) that is held to the flange when the hammer hits the bolt. This way the impact will move the bolt instead of beeing absorbed in the pipe construct. __________________ King of the road says you move to slow
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