I am in the process of changing my chain and sprockets. Most of my rear sprocket bolts crack free at about 30ftlb, but when checking their initial tightness the are at least 70ftlb, leading me to believe 80ftlb is correct.
I am cracking the bolts loose while the tire is still on the bike and doing it in a star pattern:
Interestingly enough, the studs broke free when loosening. I'm pretty sure that's not supposed to happen:
The hub thingy is not steel, magnet won't stick but the studs are magnetic.
There's some white powdery substance on one of these:
Probably some threadlock compound that didn't take?
Clean and inspect the spacer and bearings. Feels good. Loctite on deck for the loose studs only. Too chicken to use red.
New sprocket installed. Torqued each bolt four times in a star pattern adding 20ftlb each time, to 80ft-lbs. Problem children marked for later inspection:
Last edited by supertux1; 24th April 2017 at 19:56.
If there is thread lock, that may be why the stud came out with the nut. Shouldn't need any, on the stud or the nut, especially with the torque that's used.
The hub is an aluminum alloy, the studs are steel and plated to prevent corrosion (possibly clear zinc dichromate). Add in water and moisture and there's a little reaction resulting in the white powder. There certainly seems to be some thread locking compound on the end of the stud that goes into the hub. It's important that the nut rotate on the stud, and not the stud rotate in the hub, because that can cause the threads in the hub to get stripped. If the aluminum threads do get stripped, an insert can be used to repair it.
Thanks to everyone for your help. The ole NC is back in action. Got the new studs they went in fine with a bit of thread sealant and torque to 60 ft lbs.. increased incrementally from 40.