Lug nut torque?
MBWorld Fanatic!
Joined: Jul 2004
Posts: 1,743
Likes: 0
From: 43°38'N / 79°52'W
EuroCharged 2012 C63 BS Coupè
Thread Starter
Member
Joined: Jan 2010
Posts: 229
Likes: 1
From: Wisconsin
'13 Audi RS5
Trending Topics
Super Member
Joined: Oct 2008
Posts: 568
Likes: 0
From: Shanghai, Long Island(NY)
C63
sorry for ressurecting this thread.
I tried to search for the socket size for C63 lug nut and socket size for engine oil cap, but I couldn't find any. So does anybody know?
Thanks in advance!
I tried to search for the socket size for C63 lug nut and socket size for engine oil cap, but I couldn't find any. So does anybody know?
Thanks in advance!
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Junior Member
Joined: Oct 2008
Posts: 42
Likes: 0
n/a
The recommended value is there to achieve the correct amount of grip/stiffness/life on the nuts and studs. Over-tightening can cause stud breakage. As an engineer, I am quite sure the m-b value is there for a reason and has taken into account load cycles, part life and of course safety.
Most of the time, however, the recommended torque can seem a little low. This is mainly because if the threads are not clean then the recommended torque is sometimes barely more than the resistance of the (dirty) bolt/nut thread interface.
I strongly recommend removing the nuts, cleaning the threads (on both male and female parts) thoroughly and tighten them to the recommended value. Needless to say, please follow the correct sequence when doing so.
I have actually witnessed three different occasions where wheels have come off a car (twice on-track) because of some enthusiastic nut-tightener.
Administrator
Joined: Sep 2002
Posts: 15,769
Likes: 37
From: www.Traben-Trarbach.de
MPG+ ROLFCOPTER
Super Moderator Alumni
Joined: Dec 2009
Posts: 2,189
Likes: 6
From: USA
2011 GLK 350, 2013 GT-R, & 2013 RAM 1500
Super Member
Joined: Sep 2009
Posts: 948
Likes: 0
From: Seattle, WA
C63 AMG
MBWorld Fanatic!
Joined: Jul 2004
Posts: 1,743
Likes: 0
From: 43°38'N / 79°52'W
EuroCharged 2012 C63 BS Coupè
Bolts are cleaned with ethanol and wire brush at every change
Last edited by NORTH 44 C63; May 19, 2010 at 08:46 PM.
MBWorld Fanatic!
Joined: Aug 2009
Posts: 2,899
Likes: 93
C63 AMG
To each their own, I guess. I take the mfr's recommended torque, undertorque by 2lb/ft, drive 50 miles and retorque to the recommended value. In 250k miles of doing this over the past 10 years I've never had a lug nut or bolt loosen. One thing I also do is apply a superthin layer of anti-sieze to the tapered face of the nut or bolt - it helps to save the finish on the mating surface of the wheel IMO.
Junior Member
Joined: Oct 2008
Posts: 42
Likes: 0
n/a
Yes there is. The higher recommendation came from my AMG Shop foreman and backed by a contact in the Performance Studio in Affalterbach. This was in reference to the 19" 16 Spoke wheels I had ordered from Germany pre delivery...as well as the stock 18" 5 spokes.
Bolts are cleaned with ethanol and wire brush at every change
Bolts are cleaned with ethanol and wire brush at every change
Anyway, thank you for sharing
MBWorld Fanatic!
Joined: Jul 2004
Posts: 1,743
Likes: 0
From: 43°38'N / 79°52'W
EuroCharged 2012 C63 BS Coupè
That is really quite strange. I would have thought that the recommended torque (the published figures) would be the safest for the particular thread size and (mostly) road application. I would be very interested to know why they'd recommend owners to torque to under what they think works best. Humm...
Anyway, thank you for sharing
Anyway, thank you for sharing
MBWorld Fanatic!
Joined: Aug 2009
Posts: 2,899
Likes: 93
C63 AMG
I assume you mean threads only because that is not the place I am talking about and the threads are the only thing that matters, so no lube on the threads is correct. That said, IMHO 130 lb/ft is just plain crazy, it runs counter to EVERYTHING I've ever heard or read about torquing lug nuts/bolts.
Last edited by bhamg; May 20, 2010 at 10:33 PM.
Super Member
Joined: Nov 2009
Posts: 690
Likes: 1
From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
I tracked the car at 96lbs and the bolts did slightly loosen up, however 130 seems a lot! I'll try 100 next time and go from there.
Super Member
Joined: Oct 2008
Posts: 568
Likes: 0
From: Shanghai, Long Island(NY)
C63
Junior Member
Joined: Oct 2008
Posts: 42
Likes: 0
n/a
I look forward to hearing from you guys!
Thank you NORTH 44 C63
Super Member
Joined: Nov 2009
Posts: 690
Likes: 1
From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
Ok good too know. They weren't that loose but did require tightening about twice a day, which isn't that much for track use. However it was extremely cold so I can imagine it will be much worst under hot weather.
MBWorld Fanatic!
Joined: Jul 2008
Posts: 1,021
Likes: 0
From: Massachusetts
'14 911S (garage queen) '13 X3 (family hauler)
96 ft lb = 130 nm
I think that was what was going on here.
Here inthe US "we" use ft lbs and in most of Europe they use nm for torque numbers
If you compare the two values they are the same and MB lists both figures as correct.
I would guess that the MB techs in NA use nm and the metric system in general when working on our cars, so that is my guess.
Just make sure you know which one you're using and you should be okay
96 ft lbs is correct
130 nm is also correct
I think that was what was going on here.
Here inthe US "we" use ft lbs and in most of Europe they use nm for torque numbers
If you compare the two values they are the same and MB lists both figures as correct.
I would guess that the MB techs in NA use nm and the metric system in general when working on our cars, so that is my guess.
Just make sure you know which one you're using and you should be okay
96 ft lbs is correct
130 nm is also correct
Out Of Control!!
Joined: Nov 2005
Posts: 18,677
Likes: 9
From: OC
a quarter mile at a time
96 ft lb = 130 nm
I think that was what was going on here.
Here inthe US "we" use ft lbs and in most of Europe they use nm for torque numbers
If you compare the two values they are the same and MB lists both figures as correct.
I would guess that the MB techs in NA use nm and the metric system in general when working on our cars, so that is my guess.
Just make sure you know which one you're using and you should be okay
96 ft lbs is correct
130 nm is also correct
I think that was what was going on here.
Here inthe US "we" use ft lbs and in most of Europe they use nm for torque numbers
If you compare the two values they are the same and MB lists both figures as correct.
I would guess that the MB techs in NA use nm and the metric system in general when working on our cars, so that is my guess.
Just make sure you know which one you're using and you should be okay
96 ft lbs is correct
130 nm is also correct
MBWorld Fanatic!
Joined: Apr 2009
Posts: 6,020
Likes: 532
From: Alexandria, VA
07 E63 AMG, 10 C63 AMG, 07 E63 Designo, 07 E350, 09 C300, 07 C230
This is funny, because my AMG Tech told me to torque the lugbolts to 110 ft lbs. And he's the Master AMG Tech at Amercian Service Center.
