tightening lug nuts
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Fleet Mechanic
Joined: Jun 2002
Posts: 1,986
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From: maryland
tightening lug nuts
im replacing front rotors soon and want to make sure that im not hurting them be installing wheels wrong. i now see everyone is using torque wrenches. i always ran the lugs on 1 at a time to tight in aq star pattern then around in a circle to finish.
what is the proper way?
i dont even own a torque wrench. are they expensive? where to buy?
thanks!
what is the proper way?
i dont even own a torque wrench. are they expensive? where to buy?
thanks!
Posting Guru
Joined: Nov 2000
Posts: 1,005
Likes: 1
From: Cincinnati, Ohio
1995 Ford service manual shows torque on eight and 10 lug F250-350-450 trucks with 9/16 - 18 threaded studs at 140 lb-ft. I don't imagine 10 lbs either way is a big deal.
My own method is to torque all to 50 lb-ft in a star pattern then 100 lb-ft again in a star pattern then to 140 lb-ft in a star pattern then go around the wheel to double check 140 lb-ft.
Dave / Believer45
My own method is to torque all to 50 lb-ft in a star pattern then 100 lb-ft again in a star pattern then to 140 lb-ft in a star pattern then go around the wheel to double check 140 lb-ft.
Dave / Believer45
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Freshman User
Joined: Jul 2003
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Yes stage torquing is a good thing to do. Also be sure to recheck after a couple trips around the block..
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Scary thing is, I have friend's F250 on loan for the weekend. I rotated his tires for him, and tightened them down to 150#. Then, being paranoid, called the local dealer's service dept and asked them what the correct torque was for lug nuts on an F250. Guess what they told me?
100#!
I decided to go with the owner's manual over the dealer. Sheesh.
100#!
I decided to go with the owner's manual over the dealer. Sheesh.
Posting Guru
Joined: Nov 2000
Posts: 1,005
Likes: 1
From: Cincinnati, Ohio
Originally Posted by rhenriksen
...called the local dealer's service dept and asked them what the correct torque was for lug nuts on an F250. Guess what they told me?
100#!
I decided to go with the owner's manual over the dealer. Sheesh.
100#!
I decided to go with the owner's manual over the dealer. Sheesh.
Maybe your dealership was looking up the torque output of a ricer for someone else and got the numbers mixed?
MY LUGNUTS TAKE MORE TORQUE THAN YOUR CIVIC PUTS OUT
Dave / Believer45
Last edited by believer45; Mar 14, 2005 at 06:21 PM.
Lead Driver
Joined: May 2003
Posts: 9,303
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From: Lyndonville, Vermont
You guys make a big stink about torque and the lug nuts. On the super duty the design of the rotor and hub make it impossible to warp the rotors with loose or differently torqued nuts. some other designs where the studs are in the body of the rotor are definetly affected by different torques. All the wheel does is squeeze the thin rotor metal between it and the hub. All I'm saying is that its not that important on the Super Duty trucks..Now 2wd trucks with a rotor with the studs in it and you can warp that all to heck. The automotive industry gives those torques so the nuts will never fall off.
Posting Guru
Joined: Nov 2000
Posts: 1,005
Likes: 1
From: Cincinnati, Ohio
Had an issue a few years back with overtorquing cracking the cast hubs on a series of semis. Drum brakes so it was not a brake rotor issue.
Overtorquing cracks wheels, breaks studs.
Undertorquing lets wheels "work" and can oval out the tapered stud holes, also can cause excessive runout.
But what do I know - 31 years in trucking, over half in maintenance as a supervisor, trainer, manager and occasional wrench turner.
Dave / Believer45
Overtorquing cracks wheels, breaks studs.
Undertorquing lets wheels "work" and can oval out the tapered stud holes, also can cause excessive runout.
But what do I know - 31 years in trucking, over half in maintenance as a supervisor, trainer, manager and occasional wrench turner.
Dave / Believer45
Last edited by believer45; Mar 15, 2005 at 08:04 AM.