Strut Brace Bolt Torque Setting

RichardGM4 · 03-10-2024, 09:21 AM

Asking for someone on another UK-based forum, as the guys in the US seem to know more of this type of technical info!

Anyone know the torque setting of this strut brace bolt?

Hit_Apex · 03-10-2024, 09:42 AM

28NM plus 120 AoR.

https://g80.bimmerpost.com/forums/sh....php?t=1895116

Hit_Apex · 03-11-2024, 02:13 PM

To clarify, that is 1 of 4 M8 bolts that fasten the strut top to the body which is listed as 28NM (~20ft/lbs) and then 120 degrees of additional rotation.

christianb5s4 · 03-11-2024, 04:59 PM

Thank you for sharing, I did 28nm but didn't know about the 120 degrees additional.

USMC_Sam · 03-11-2024, 07:20 PM

Quote:

Originally Posted by Hit_Apex

To clarify, that is 1 of 4 M8 bolts that fasten the strut top to the body which is listed as 28NM (~20ft/lbs) and then 120 degrees of additional rotation.

Seems odd that there would be a spec torque and then a wrench arch torque. I would think its either one or the other.

Berzerker · 03-11-2024, 07:24 PM

Quote:

Originally Posted by USMC_Sam

Seems odd that there would be a spec torque and then a wrench arch torque. I would think its either one or the other.

I was curious also so I looked it up, here's a random r/askengeineers thread for some insight

https://old.reddit.com/r/AskEngineer...pecifications/

USMC_Sam · 03-11-2024, 07:54 PM

Quote:

Originally Posted by Berzerker

I was curious also so I looked it up, here's a random r/askengeineers thread for some insight

https://old.reddit.com/r/AskEngineer...pecifications/

That implies that there is an interference fit that needs to be overcome with tension from torque. I haven't pulled off the tower mount yet so I dont know.

Digging a little deeper into the image, thats a grade 10.9 bolt, which is capable of 48.3 NM (35.6 ft-lbs) trq. Its very likely that it can handle a 28 NM + 120 deg of rotation.

https://www.engineeringtoolbox.com/m...ue-d_2054.html

forcefed · 03-13-2024, 07:53 PM

Everyone replacing those bolts when removing the strut?
I wonder if its possible to compress the spring with a compressing tool while the strut is still installed and then pull the strut out by undoing the nut on top of the strut, on rwd this is possible without compressing the springs but on xdrive models there's only a bit of room to pull out the whole strut.

M4Lou · 03-13-2024, 08:17 PM

Quote:

Originally Posted by forcefed

Everyone replacing those bolts when removing the strut?
I wonder if its possible to compress the spring with a compressing tool while the strut is still installed and then pull the strut out by undoing the nut on top of the strut, on rwd this is possible but on xdrive models there's only a bit of room to pull out the whole strut.

I'm sure BMW wants you to. I loosened/tightened those or similar on M4 and X3M fronts and X3M rears. Did not replace. Very new vehicles.

03-10-2024, 09:21 AM	#1
RichardGM4 First Lieutenant 527 Rep 399 Posts Drives: 2024 G80 M3 CS Join Date: Jun 2019 Location: UK iTrader: (0)	Strut Brace Bolt Torque Setting Asking for someone on another UK-based forum, as the guys in the US seem to know more of this type of technical info! Anyone know the torque setting of this strut brace bolt? Attached Images __________________ Current: BMW G80 M3 CS (2024 BSM w/ Bronze/Gold 827M wheels) - BMW G82 M4 Competition xDrive (2022 TBII w/ Silverstone/Black & M Carbon Pack) - BMW F82 M4 Competition (2019 BSM w/ Silverstone)
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03-10-2024, 09:42 AM	#2
Hit_Apex Riding the knock sensor 2371 Rep 1,591 Posts Drives: 21 X5MC \| 23 M4CSL Join Date: May 2008 Location: PCH iTrader: (1) Garage List 2021 BMW X5MC [0.00]	28NM plus 120 AoR. https://g80.bimmerpost.com/forums/sh....php?t=1895116 __________________
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03-11-2024, 02:13 PM	#3
Hit_Apex Riding the knock sensor 2371 Rep 1,591 Posts Drives: 21 X5MC \| 23 M4CSL Join Date: May 2008 Location: PCH iTrader: (1) Garage List 2021 BMW X5MC [0.00]	To clarify, that is 1 of 4 M8 bolts that fasten the strut top to the body which is listed as 28NM (~20ft/lbs) and then 120 degrees of additional rotation. __________________
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03-11-2024, 04:59 PM	#4
christianb5s4 Lieutenant 824 Rep 589 Posts Drives: Built 2001 Audi S4 Join Date: Jan 2019 Location: Newport Beach, CA iTrader: (0)	Thank you for sharing, I did 28nm but didn't know about the 120 degrees additional. __________________ 2024 M3 CompX Dravit Grey - MP HAS - Millway - MHC+ carbon - CS software - MAD single-mid - PPF 2019 G05 X5 x40i, built 2001 600whp B5 S4.
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03-13-2024, 07:53 PM	#8
forcefed Lieutenant Colonel 2563 Rep 1,927 Posts Drives: . Join Date: Sep 2021 Location: Toronto iTrader: (0)	Everyone replacing those bolts when removing the strut? I wonder if its possible to compress the spring with a compressing tool while the strut is still installed and then pull the strut out by undoing the nut on top of the strut, on rwd this is possible without compressing the springs but on xdrive models there's only a bit of room to pull out the whole strut. __________________ 2023 m3 xdrive For sale: M3 Eibach pro kit springs, csl gloss black grill with acc, gloss black lip Last edited by forcefed; 03-13-2024 at 08:21 PM..
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