I was torquing lug nuts way too fast for a decade

I was doing a brake job on a 2015 F-150 last Tuesday, just zipping the lugs on with my impact like always. The shop owner, Frank, who's been at this since the 70s, walks by and just says 'You know, you're gonna warp a rotor doing it that way.' I stopped and asked what he meant. He showed me his old beam torque wrench and said he hand-tightens them all first, then does a star pattern with the wrench set to spec, which for that truck was 150 foot-pounds. I'd been hitting them with the gun on full power until they 'felt' tight, which was probably way over. It hit me that I'd been teaching apprentices to do it wrong too. How many slight vibrations or early rotor warps did I cause by being in a hurry? Does anyone else have a specific final torque step they do for wheels, or is it just me who was sloppy?

2 comments

2 Comments

emery_hall20d ago

Man, that hits home. I did the EXACT same thing for years, just blasting them on. You don't even realize the damage until someone points it out. I had a customer come back with a shake and felt so stupid when we found the warped rotor. Now I do the hand-tighten and star pattern with a torque wrench Every Single Time. It feels slow at first but you get used to it, and it saves so much headache. Frank saved you a ton of future comebacks.

the_brooke20d ago

Ever wonder how many shops skip the torque wrench because it's "fast enough"? @emery_hall is right, you don't see the damage right away. I've seen guys snap a lug off trying to get a wheel off they over-torqued six months prior. That slow, right way becomes the only way once you've paid for a rotor you warped yourself.