| [GMCnet] Wheel lug nut torque [message #348187] |
Fri, 20 September 2019 12:11  |
Gerard Hickey
Messages: 53
Registered: June 2019
Karma: 1
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While I am thinking about it, this past weekend when I dropped the fuel
tanks I needed to pull one of the wheels to get to the air/liquid
separator that was located behind the wheel. I torqued the lug nuts down
to 100 ft-lbs based on what Les Schwab torqued them down to when I had
the tires replaced. But I seem to remember that the manual had some
absurdly crazy torque specification. Unfortunately, I don't have the
manuals here to reference that specification, but I thought it was in
the order of 250 ft-lbs. Maybe I am thinking of something else....
So what is a good torque for the lug nuts? I have the Alcoa hubs instead
of the original steal hubs if that makes a difference.
Thanks.
--
Gerard Hickey / WTØF IRLP:3067/Echolink:529661
hickey@kinetic-compute.com DMR: 3102272
425-395-4554
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| Re: [GMCnet] Wheel lug nut torque [message #348191 is a reply to message #348187] |
Fri, 20 September 2019 14:29  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Sir, 140 ft lb on Alcoas .
Gerard Hickey wrote on Fri, 20 September 2019 13:11While I am thinking about it, this past weekend when I dropped the fuel
tanks I needed to pull one of the wheels to get to the air/liquid
separator that was located behind the wheel. I torqued the lug nuts down
to 100 ft-lbs based on what Les Schwab torqued them down to when I had
the tires replaced. But I seem to remember that the manual had some
absurdly crazy torque specification. Unfortunately, I don't have the
manuals here to reference that specification, but I thought it was in
the order of 250 ft-lbs. Maybe I am thinking of something else....
So what is a good torque for the lug nuts? I have the Alcoa hubs instead
of the original steal hubs if that makes a difference.
Thanks.
--
Gerard Hickey / WTØF IRLP:3067/Echolink:529661
hickey@kinetic-compute.com DMR: 3102272
425-395-4554
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Wheel lug nut torque [message #348192 is a reply to message #348191] |
Fri, 20 September 2019 14:35 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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250 ft lb torque on OEM steel wheels and lug nuts.
C Boyd wrote on Fri, 20 September 2019 15:29Sir, 140 ft lb on Alcoas .
Gerard Hickey wrote on Fri, 20 September 2019 13:11While I am thinking about it, this past weekend when I dropped the fuel
tanks I needed to pull one of the wheels to get to the air/liquid
separator that was located behind the wheel. I torqued the lug nuts down
to 100 ft-lbs based on what Les Schwab torqued them down to when I had
the tires replaced. But I seem to remember that the manual had some
absurdly crazy torque specification. Unfortunately, I don't have the
manuals here to reference that specification, but I thought it was in
the order of 250 ft-lbs. Maybe I am thinking of something else....
So what is a good torque for the lug nuts? I have the Alcoa hubs instead
of the original steal hubs if that makes a difference.
Thanks.
--
Gerard Hickey / WTØF IRLP:3067/Echolink:529661
hickey@kinetic-compute.com DMR: 3102272
425-395-4554
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Wheel lug nut torque [message #349535 is a reply to message #348192] |
Tue, 22 October 2019 10:05 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Senior Member |
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On 20.09.19 21:35, Charles Boyd via Gmclist wrote:
> 250 ft lb torque on OEM steel wheels and lug nuts.
>
>
> C Boyd wrote on Fri, 20 September 2019 15:29
>> Sir, 140 ft lb on Alcoas .
In the past, there has been a discussion about the torque before.
https://groups.google.com/forum/m/?fbclid=IwAR0imSu4WNsI6Mx1yFPlp8e7Ok0dmBH7qdoAp0MCDQBu1-OgYiV5AueSJSU#!topic/gmcnet-archive/iZeLAsOmQs4
Anyone care to shed a light on, what's true and what's not?
--
Best regards
Peer Oliver Schmidt
PGP KeyID: 0x4196BF22
*currently needing to retorque two wheels*
'76a 26' Eleganza II - Virginia, US
'73 23' Sequoia - Schleswig-Holstein, Germany
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Wheel lug nut torque [message #349539 is a reply to message #349535] |
Tue, 22 October 2019 13:09 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Peer Oliver Schmidt wrote on Tue, 22 October 2019 11:05On 20.09.19 21:35, Charles Boyd via Gmclist wrote:
250 ft lb torque on OEM steel wheels and lug nuts.
> C Boyd wrote on Fri, 20 September 2019 15:29
>> Sir, 140 ft lb on Alcoas .
In the past, there has been a discussion about the torque before.
https://groups.google.com/forum/m/?fbclid=IwAR0imSu4WNsI6Mx1yFPlp8e7Ok0dmBH7qdoAp0MCDQBu1-OgYiV5AueSJSU#!topic/gmcnet-archive/iZeLAsOmQs4
Anyone care to shed a light on, what's true and what's not?
--
Best regards
Peer Oliver Schmidt
PGP KeyID: 0x4196BF22
*currently needing to retorque two wheels*
'76a 26' Eleganza II - Virginia, US
'73 23' Sequoia - Schleswig-Holstein, Germany
Peer,
I am going to try to sort where this will leave you.
You were not there, but the presentation I did at the last rally at Amana was reproduced in "Vintage RVing" Fall 2018 and is available on the GMCMI website will shead some light here. If you get this open and look at page 17, you we see that we (as a part of ASTM) identified 54 variables that significantly influenced the torque/tension relationship in a threaded fastener. Five of those were specifically about the lubrication and another 6 are specific to the material finish involved.
The situation with our studs, nuts and bearing surface of the nuts is about as bad as could be hoped. As such, I do fully believe that one can burn-off the additional 100+#-ft of torque just in the friction. In my case this has proved true. Very early in my GMC experience, I did break a stud on one of the front hubs. Inspection revealed that it had been fractured before I got the chance.
As stated in the referenced in that thread, I now use either the OE (forged) lug wrench or (if at home) the 3/4 drive ratchet and both with a piece of pipe. With the wrench in place, I put my full shoulder weight on the tool and that is real close. I do have a doubler for one of my beam type torque wrenches. When I set it up with a tracer to record the value some years back, I did a "Torque to Align" on several lug nuts and determined that I was real close to the 240#-ft value.
An interesting thing is that all that friction, aside from being an assembly nightmare, actually sort of works for us. When I did that "Torque to Align" previously mentioned, one starts by backing of the fasteners and re-torquing so the marked fastener is re-aligned with the mark of its original position. The tracer works both way, and the threshold to back the nuts loose was nearly what was seen at the alignment. So, that friction also serves as a locking mechanism. This is why I have resisted the temptation to put any lubrication or anti-sieze on the studs/nuts.
I have not done any of this with Aloca or other alloy wheels that use a Stem Nut (Nut with attached finished washer). That could change the situation very profoundly. Without real data, I will not even venture a guess by how much.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Wheel lug nut torque [message #349543 is a reply to message #348187] |
Tue, 22 October 2019 16:42 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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140 for Alcoas. It is stamped right on the nuts. The confusing part is the tightening sequence which is NOT intuitive but is on the Alcoa website.
John Lebetski
Woodstock, IL
77 Eleganza II
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