Help locating a specific bolt

kawstik · 10-05-2019, 01:43 PM

Hey folks.

Noticed some rattling coming from the rear of my E92 M3. After climbing under it, I noticed a rear muffler heat shield bolt is missing. It's the bolt that secures both heat shields where they overlap toward the front of the car.

I've searched high and low to find this thing to no avail. It must have a unique thread as I've tried just about every thread pattern out there.

Any help would be appreciated. Thanks in advance!

Pics attached:

randrews15 · 10-05-2019, 04:06 PM

I do believe that maybe the 8mm black bolt that is very commonly used on the under trays. I'd look at real OEM and try to locate the correct part numbers for the bolt and then type that into ECS's website or FCP Euro. I always order an extra one in case something like this happens down the road.

Helmsman · 10-05-2019, 04:34 PM

Jeez thats a clean underside!

nissanite · 10-05-2019, 05:46 PM

Take one out beside it and play the match game.

kawstik · 10-05-2019, 09:54 PM

Quote:

Originally Posted by nissanite

Take one out beside it and play the match game.

Unfortunately it's not the same bolt. Tried multiple heat shield bolts. No dice.

msan · 10-05-2019, 11:21 PM

https://www.fcpeuro.com/products/bmw-hex-bolt-with-washer-m8x128-8zns3-07119903930

This one?

roastbeef · 10-05-2019, 11:40 PM

i was going to say it looks like maybe an m8 bolt. there are 4-5 different bolts under there.

kawstik · 10-06-2019, 11:46 AM

I just ended up buying one of every bolt listed on the heat shield diagram.

Thanks gents.

Scharbag · 10-06-2019, 05:17 PM

Quote:

Originally Posted by kawstik

I just ended up buying one of every bolt listed on the heat shield diagram.

Thanks gents.

Let us know which it was so we know for future

kawstik · 10-10-2019, 05:56 PM

Quote:

Originally Posted by Scharbag

Let us know which it was so we know for future

So the correct bolt is an M10 coarse thread. That said, these heat shield bolts seat into the plastic tub that holds the emergency compressor, and upon snugging it up, it immediately stripped.

FYI - each one of the highlighted circles in the below tub corresponds with a heat shield bolt:

So I just bought a 1 1/2" M10 stainless bolt from Home Depot, popped a hole through the plastic tub, gave it a healthy slather of silicone to waterproof it, and threw a lock nut on the inside of the trunk. I'd definitely go this route of you ever lose one.

deansbimmer · 10-11-2019, 08:04 AM

The nut insert is missing. That's why you can't find any bolt that fits. They often pull out with the bolt, especially in rusty cars. The correct repair is to replace the tub. Sometimes (as long as you havent lost it) you can remove the nut insert from the bolt and reinstall it into the tub with 2 part adhesive. kawstik has posted an intermediate repair that also works in a pinch.

10-05-2019, 01:43 PM	#1
kawstik Lieutenant 583 Rep 434 Posts Drives: E92 M3 6MT Join Date: Jan 2014 Location: Pittsburgh, PA iTrader: (13)	Help locating a specific bolt Hey folks. Noticed some rattling coming from the rear of my E92 M3. After climbing under it, I noticed a rear muffler heat shield bolt is missing. It's the bolt that secures both heat shields where they overlap toward the front of the car. I've searched high and low to find this thing to no avail. It must have a unique thread as I've tried just about every thread pattern out there. Any help would be appreciated. Thanks in advance! Pics attached: __________________
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10-05-2019, 04:06 PM	#2
randrews15 Lieutenant 284 Rep 552 Posts Drives: 2012 E93 M3 Le Mans Blue Join Date: Nov 2012 Location: Parrish, FL iTrader: (1)	I do believe that maybe the 8mm black bolt that is very commonly used on the under trays. I'd look at real OEM and try to locate the correct part numbers for the bolt and then type that into ECS's website or FCP Euro. I always order an extra one in case something like this happens down the road.
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10-05-2019, 04:34 PM	#3
Helmsman Major General 4447 Rep 7,101 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Jeez thats a clean underside!
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10-05-2019, 05:46 PM	#4
nissanite Private 46 Rep 68 Posts Drives: 340i M-sport Join Date: Jun 2018 Location: Florida iTrader: (0) Garage List 2016 BMW 340i [0.00]	Take one out beside it and play the match game.
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10-05-2019, 11:21 PM	#6
msan Major 403 Rep 1,171 Posts Drives: 2011 E90 M3 / 2012 X5 35i M Sp Join Date: May 2015 Location: Los Angeles, CA iTrader: (16)	https://www.fcpeuro.com/products/bmw-hex-bolt-with-washer-m8x128-8zns3-07119903930 This one?
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10-05-2019, 11:40 PM	#7
roastbeef Lieutenant General 11583 Rep 12,723 Posts Drives: E92 M3 Join Date: Nov 2010 Location: Orange County, CA iTrader: (4)	i was going to say it looks like maybe an m8 bolt. there are 4-5 different bolts under there. __________________ Instagram; @roastbeefmike
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10-06-2019, 11:46 AM	#8
kawstik Lieutenant 583 Rep 434 Posts Drives: E92 M3 6MT Join Date: Jan 2014 Location: Pittsburgh, PA iTrader: (13)	I just ended up buying one of every bolt listed on the heat shield diagram. Thanks gents. __________________
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10-11-2019, 08:04 AM	#11
deansbimmer BimmerPost Supporting Vendor 3749 Rep 2,907 Posts Drives: 2011 E93 M3 Join Date: Nov 2014 Location: DFW, Texas iTrader: (17) Garage List 1988 BMW M3 [0.00] 2013 BMW M3 [0.00] 2011 X5M [0.00] 2011 BMW M3 [0.00]	The nut insert is missing. That's why you can't find any bolt that fits. They often pull out with the bolt, especially in rusty cars. The correct repair is to replace the tub. Sometimes (as long as you havent lost it) you can remove the nut insert from the bolt and reinstall it into the tub with 2 part adhesive. kawstik has posted an intermediate repair that also works in a pinch.
	Appreciate 0 Quote