John52

Okay, here is a question for you engineer types out there.
When I remove wheel nuts, it seems that some nuts release smoothly with what feels like the same amount of torque that was used to tighten them.
However, other nuts require what feels like considerably more force to loosen them and they release with a loud "crack". I used to attribute this "bonding" to be as a result of heat and/or some form of corrosion.
Last week, however, I mounted some new wheels, torqued them and then removed them 15 minutes later to check clearances ,etc, Even after this short a time, most nuts released smoothly, but a couple gave a snap when removed. I always use a digital torque wrench when tightening wheel nuts so I don't think they were over torqued.

Any ideas what causes some nuts to resist removal?

cobalt

Never seize compound.

warmfuzzies

Always check if the torque is wet or dry, if dry and you use copper slip etc, reduce the torque by around 25% yep that much, take notice you can destroy fittings with too much effort........................

Kevin

dfinnegan

Is the wheel nut torque (96 ft lbs iirc) wet or dry?

springer3

Dry. I use 70 ft-lb, and use copper paste sparingly (keep it off the sphereical seats (between the wheel and the nut) and the mounting hub. I don't like the dry stick from bone-dry bolts, but that is the factory preference, I assume because they aren't sure you will use the correct paste.

JasonAndreas

and if you use any of the thread lubes that Porsche sells like Optimoly HT, TA, etc. then the fastener torque specifications do not change.