e46 M3 torque spec thread-- every bolt on the car on diagrams

[heinzboehmer]

Hmm, BMW definitely made this one confusing. Looks like you're right that the side covers are type G, but the diff case is a 210N:



Confusing cause there's "K"s in both. Plus there's no E46 M3 info about the side covers.

Anyway, I think you're correct, so I updated the doc (see first post). Thanks for bringing this up!

[bmwfnatic]

I think another change should be made to this document.
Page 82 where there is a picture of the diff, there is this odd spec of 13.5 Nm (10 ft-lb) + 40-degree angle.

This seemed specific and odd to me, so I dug a bit deeper to figure out where it came from.

I entered E36 M3 into TIS, since E46 M3 has no instructions really in regard to the internals of the diff.



It is quite easily found where this data comes from, there seems to be a slight mix-up between Nm and ft-lb, but regardless.

However, the diff found in the E46 M3 is not a 'Type K' diff, it qualifies as a 'Type G'
According to TIS, this is determined simply by counting bolts.


This would make the torque spec in the PDF for a totally different type of diff, not good.
I believe the correct spec should therefore be 22 Nm.

Furthermore TIS also states Loctite 270 is required, which is a high strength thread locker, while the PDF currently has 242/243 which is medium strength listed as what should be used.



Since it seems heinzboehmer is the active maintainer of these edits, I think this should be corrected.

[heinzboehmer]

Hmm, yeah that's a weird one. TIS doesn't actually list the S54 torque value:




There is that blank line at the bottom with the 50 Nm value, but not sure what that's supposed to be for. Considering that the tensioner is the same part as the one on the S52, I think the 70 Nm value makes more sense.

I've never been able to fit a torque wrench on it though, so I kinda just guess

Anyway, updated the file with the 70 Nm spec: (see first post)

[NE///M3SIS]

Hey guys, thought I would add my 2 cents.

Just recently finished a complete rebuild on my S54. Video to come in the next week.

I torqued the Chain Tensioner to the recommended torque setting in this guide (50nm/37ft-lb).

I let the engine idle for a couple minutes after reinstalling it into the car and discovered oil leaking from the chain tensioner. YES, a brand new washer from BMW was used. See images below.

Buildjournal says to torque to 70nm. I then torqued the chain tensioner to 70nm/52ft-lb and now there is no more oil leak. So perhaps this file needs to be updated to reflect that?

Cheers.

[Lavatoad]

70Nm is right by TIS. 85 for non M

Thank you. Just changed my pinion seal, and putting everything back together.

Sent from my LM-V600 using Tapatalk

[Shonky]

70Nm is right by TIS. 85 for non M

[Lavatoad]

Anyone have a definitive number for the torque spec on the driveshaft bolts to the diff input flange?

I've seen 3 different specs; this file (70 nm), a different (similar) torque pdf (85 nm), and the Bentley pdf (80-83 nm).

Sent from my LM-V600 using Tapatalk

[heinzboehmer]

In the TIS, the torque spec for the banjo bolt on the side of the valve cover is 19 Nm (not 25 Nm like in the PDF).

So that's why it always feels like I'm overtorquing that bolt. Even managed to break it once.

Anyway, fixed. Changed all links in previous comments to go to the updated doc.

[Slideways]

In the TIS, the torque spec for the banjo bolt on the side of the valve cover is 19 Nm (not 25 Nm like in the PDF).

[Shonky]

Thanks. First post link still works and links to old version unfortunately.

[heinzboehmer]

Updated the document to reflect the correct torque for the front caliper carrier bracket bolts. Front is 81 ft lbs rear is 48 ft lbs. This is the new link for the document, old one doesn't go anywhere anymore: (see first post)

[Shonky]

Is the April 2020 still the latest edition of the torque PDF ?

Yes

[ac427]

Can a mod update the original post or the linked file. People are still referring to the version linked there from April 2016. The April 2020 version has about 20 more pages of info and some items fixed up.

This is the correct one IMO:
https://nam3forum.com/forums/forum/m...=5291#post5291

Is the April 2020 still the latest edition of the torque PDF ?

[Shonky]

Can a mod update the original post or the linked file. People are still referring to the version linked there from April 2016. The April 2020 version has about 20 more pages of info and some items fixed up.

This is the correct one IMO:

https://nam3forum.com/forums/forum/main-forum/e46-2001-2006/414-e46-m3-torque-spec-thread-every-bolt-on-the-car-on-diagrams?p=5291#post5291

[JMUDoc]

Thanks to Flow, back on M3forum:

http://sawashie.free.fr/M3/TorqueSpe...SPECS%20LR.pdf

Magnificent - one of the most helpful forum posts I've ever seen.

(I've only got a 325i, but still...)