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Lug nut torque ?

Posted: Wed Sep 02, 2020 3:23 pm
by Iainboyd
Okay I've looked through the Ford Works manual (what parts I have of it ) the Haynes Ranger Manual and NOT ONE gives the torque settings for the lug (wheel) nuts, I'm curious as the habit of 90% of tyre companies (Bob Jane, Tyrepower etc. ) seem to just set their air powered hammer guns on maximum.

Re: Lug nut torque ?

Posted: Wed Sep 02, 2020 3:44 pm
by Bala1
It in my owners manual under wheels and tyres.

There are torque bars for impact guns. Like an extension that will do the nut up to set amount. I don't know there accuracy.

Re: Lug nut torque ?

Posted: Thu Sep 03, 2020 7:13 am
by Bala1
They are a 12 x 1.5, Owners Manual lists 135nm which 100ft lb,

Which would suggest they are a grade 10.9 stud. Just a finer thread to the bolts used in the tow bar.

I would recommend if you have the original wheel nuts you get them changed for all steel, at about $2 a nut it is worth it.

The originals on my 2016/17ranger and escape were alloy over steel, easily damaged.

Re: Lug nut torque ?

Posted: Thu Sep 03, 2020 8:24 am
by Iainboyd
RossPat wrote: Wed Sep 02, 2020 10:03 pm Been told by Ford & others it is 100ft lb
The caravan is the same.
Yes, 135 Nm has been confirmed

Re: Lug nut torque ?

Posted: Thu Sep 03, 2020 8:45 am
by Iainboyd
Thanks to you all for your input.

I had used my new Ryobi 18 volt cordless impact hammer drill to put them on, and I can now confirm that the Brushless model with 3000 impacts per minute will do the 3/4" lug nuts up to over 135 Nm (100 ft /pounds) quite easily but to be safe I used a good torque wrench to verify that reading, seeing a wheel pass you on the freeway isn't the best of sensations and I really needed to put my mind at rest.

Seriously you would think that this lug nut torque setting would be in the front of every manual as its possibly the one thing that all vehicle owners will experience in their driving lifetime - having to change a wheel with a flat tyre.

Re: Lug nut torque ?

Posted: Thu Sep 03, 2020 9:04 am
by Bala1
Keep in mind that when you do up a bolt/nut you are stretching the bolt, this is how it achieves tension so over tightening is damaging the bolt/stud leading to broken studs.

IMHO best practice when using impact guns is to use them to spin up the nut and apply a small amount of torque, then use your tension wrench or bar to finish. If you have used an impact gun and then when you check with a tension wrench it click off without the nut moving you should back the nut off and retention.

Re: Lug nut torque ?

Posted: Thu Sep 03, 2020 2:50 pm
by Iainboyd
Bala1 wrote: Thu Sep 03, 2020 9:04 am Keep in mind that when you do up a bolt/nut you are stretching the bolt, this is how it achieves tension so over tightening is damaging the bolt/stud leading to broken studs.

IMHO best practice when using impact guns is to use them to spin up the nut and apply a small amount of torque, then use your tension wrench or bar to finish. If you have used an impact gun and then when you check with a tension wrench it click off without the nut moving you should back the nut off and retention.
Yes, I'm very aware of over tightening nuts and bolts.
One of the tests I did was to apply the Ryobi impact wrench to two "test" nuts and bolts held in my workshop vice, once the clutch had kicked in I then undid them with the standard torque wrench --in both tests the torque was under 140 Nm -- impact gun was incapable of applying more than 140 Nm of torque before the auto-clutch kicked in to spare the DC 18 volt motor. It's certainly a "tool" I'll carry in the Wildtrak when we go bush later in the year.