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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes F10 535d wheel lug nuts torque
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      09-29-2010, 12:58 PM   #1
Jon D
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F10 535d wheel lug nuts torque

Does anyone know what the tightening torque is?
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      09-29-2010, 02:13 PM   #2
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Should be 90 +2 or 3 max. - Higher because it's using the M14 bolts vs The E60 (88) M12 bolts
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      09-29-2010, 03:24 PM   #3
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I asked the service adviser who called the technicians who looked it up,and he said it's the same as E60 90 ft-lbs
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      09-29-2010, 04:23 PM   #4
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Thanks guys, but there seems to be an element of confusion here.
Since posting the question I checked the instruction leaflet that was included in the BMW locking lug nut pack for my E92.
It's a general leaflet catering for most models including 3 and 5 series and it's issued by BMW.
It clearly states the following:
120+/-10 Nm for all versions in M12
140+/-10 Nm for all versions in M14
For reference 120 Nm = 88.5 Ft/Lbs, 140 Nm = 103 Ft/Lbs. Going by that, 90 Ft/Lbs doesn't reach the lower end of the tolerance band.
I get a bit anal about things like torque settings and tyre pressures, so I'll call my local dealer in the morning and see what they come up with - I'll let you know.
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      09-29-2010, 04:29 PM   #5
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Quote:
Originally Posted by Jon D View Post
Thanks guys, but there seems to be an element of confusion here.
Since posting the question I checked the instruction leaflet that was included in the BMW locking lug nut pack for my E92.
It's a general leaflet catering for most models including 3 and 5 series and it's issued by BMW.
It clearly states the following:
120+/-10 Nm for all versions in M12
140+/-10 Nm for all versions in M14
For reference 120 Nm = 88.5 Ft/Lbs, 140 Nm = 103 Ft/Lbs. Going by that, 90 Ft/Lbs doesn't reach the lower end of the tolerance band.
I get a bit anal about things like torque settings and tyre pressures, so I'll call my local dealer in the morning and see what they come up with - I'll let you know.
I got confused by the exact same thing, when I bought the wheel locks. I don't know what M12, or M14 was in reference to. So I asked the SA, and that's what I went with. I'm with you, now that you mention it that did bother me when I first changed the wheel locks, but I since put it out of my mind. Thanks for waking up the demons. Seriously, though, let me know what he says, in return I will call a couple other dealers in SoCal, and let you know what they say.
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      09-30-2010, 10:01 AM   #6
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Quote:
Originally Posted by gatoman39 View Post
I got confused by the exact same thing, when I bought the wheel locks. I don't know what M12, or M14 was in reference to. So I asked the SA, and that's what I went with. I'm with you, now that you mention it that did bother me when I first changed the wheel locks, but I since put it out of my mind. Thanks for waking up the demons. Seriously, though, let me know what he says, in return I will call a couple other dealers in SoCal, and let you know what they say.
My dealer said 120 Nm, which contradicts the wheel lock instructions. However, although the F10 bolts are 2 mm thicker, they do have a finer thread and would therefore take a lesser torque pro-rata to the diameter.
I torqued mine to 125 Nm, but I'm not completely happy so I'd be interested to hear what what your dealers say.
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      09-30-2010, 10:26 AM   #7
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I'll stir it a bit... don't forget the issues of dry vs. wet or dry film lube.

Just a thought, have the latest M14 bolts changed from the thread pitch of earlier applications. That could answer the value issue.

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      09-30-2010, 10:59 AM   #8
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Quote:
Originally Posted by Jon D View Post
My dealer said 120 Nm, which contradicts the wheel lock instructions. However, although the F10 bolts are 2 mm thicker, they do have a finer thread and would therefore take a lesser torque pro-rata to the diameter.
I torqued mine to 125 Nm, but I'm not completely happy so I'd be interested to hear what what your dealers say.
I have contacted 3 separate dealers:
1 service department: 90 ft/lbs
1 parts department: 90 ft/lbs
1 service department: waiting to hear...
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      09-30-2010, 05:02 PM   #9
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Quote:
Originally Posted by HighlandPete View Post
I'll stir it a bit... don't forget the issues of dry vs. wet or dry film lube.

Just a thought, have the latest M14 bolts changed from the thread pitch of earlier applications. That could answer the value issue.

HighlandPete
Yes, I'm well aware of the differences between dry, wet and dry-film torque values. I spent my entire working life in aviation engineering and even with the abundance of technical manuals, you'd still see instances of 'I-know-better'. Applying oil or grease will amplify the applied torque by around 30%; dry-film 50%. Always best to .
I don't know what the thread pitch of earlier M14 bolts was, but these are finer than those on the E92 M12's, which would indeed account for the lower setting.
I just wish BMW would include this in the handbook.
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      09-30-2010, 10:01 PM   #10
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Quote:
Originally Posted by Jon D View Post
My dealer said 120 Nm, which contradicts the wheel lock instructions. However, although the F10 bolts are 2 mm thicker, they do have a finer thread and would therefore take a lesser torque pro-rata to the diameter.
I torqued mine to 125 Nm, but I'm not completely happy so I'd be interested to hear what what your dealers say.
Crap dude, a Service Technician just emailed me in response to me inquiry:
He told me it's 140 Nm = 103 Ft/Lbs. Which is contradicting what I have heard at 3 other dealers. I emailed him back to double check.
FYI this if for a
2011 535i Sport
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      10-01-2010, 11:56 AM   #11
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OK so the service tech double checked and said 90 Ft/Lbs is the correct spec. I also contacted 2 independent tire shops, and they said the same, so that's what I'm going with.
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      10-01-2010, 12:54 PM   #12
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Quote:
Originally Posted by gatoman39 View Post
OK so the service tech double checked and said 90 Ft/Lbs is the correct spec. I also contacted 2 independent tire shops, and they said the same, so that's what I'm going with.
Thanks for your help; until I hear anything else I'll stick with 125 Mn (92 Ft/Lb) and recheck regularly. I'd rather err on the side of under as opposed to over-torque.
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      10-01-2010, 02:17 PM   #13
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103 lb seems very high, so I am right afterall. Anyway, it's better to under torque it than over torque. Bolts might break if over torque.
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      10-01-2010, 02:30 PM   #14
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Quote:
Originally Posted by Jon D View Post
Thanks for your help; until I hear anything else I'll stick with 125 Mn (92 Ft/Lb) and recheck regularly. I'd rather err on the side of under as opposed to over-torque.
Just as further reassurance, I took all the wheels off when set at factory spec with a breaker bar and they were very easy to remove. When put back on and set at 90, they are equally easy to remove. I set it to 103 ft/lbs just to check and they were much harder to remove versus when I first removed the wheels set from the factory. So I'm going with 90 ft/lbs. Hope this helps.
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      11-16-2010, 03:12 PM   #15
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Bolt torque update.
I spoke with the senior technician at my local dealer, who has kindly sent me a print-off from their maintenance computer.
F10/F11 M14 Bolt torque - 140Nm = 103 Lb/Ft.
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      11-16-2010, 06:00 PM   #16
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Quote:
Originally Posted by Jon D View Post
Bolt torque update.
I spoke with the senior technician at my local dealer, who has kindly sent me a print-off from their maintenance computer.
F10/F11 M14 Bolt torque - 140Nm = 103 Lb/Ft.
The humanity! Now you got me all worried again.
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