staniel wrote:Sorry for the confusion. 12mm hex is the measurement of the tool face. Also I may be using the wrong word when I say tapered. It's as though the middle third of the bolt has been lathed to be narrower.
A text diagram:
12mm bolt head
8mm straight rod
6mm straight rod
8mm threaded
My torque wrench is one of these all-metal ones. I don't understand how it could go wrong?
Also, the bolt is what broke, thankfully, not the block. The tapered part was sticking out of the block when I took the head off and I was able to remove it with pliers. Perhaps it's tapered so that when it breaks it leaves part of itself exposed?
Got some flanged 8x45s (non-stainless). They're 13mm tool face, but I checked and they fit. I'm gonna take off the last 2mm with sandpaper while I watch Arrested Development. Should I be using thread locker on these?
it sounds like u have stretched the bolt in the center and then it broke. i would suspect your torque wrench.
i bought a cheep 1 once and the same thing happened.
if u are stretching bolts at the proper toque setting, it cant be working properly.
take a spare bolt , the same size, put the tip of the threads tight in a vice. now try to tighten the bolt to the torque u # u used before. see if it twists the bolt, or just clicks off as it were at the proper torque.
u really need to use an inch pound wrench for this job.
can u borrow 1 from someone?
do u have a grinder? or even a drill with a grinding stone would work to shorten the bolt. or u could put a nut on it , cut the extra off with a hack saw , then remove the nut. removing the nut will straighten the last thread on the bolt , that may have gotten damaged from the hack saw.u may even find that the 45mm is not too long? place a small drill bit down the hole to measure its depth.
i would use blue loctite on the bolt.
if u want more responces, u should allways start a new thread, on your spesific problem.
