single bolt tr

Seems to be tight ???
Clean/degrease both the male and female threads. Apply a very thin film of high temp grease to the bolt threads and tighten to 325 ft-lbs. That sucker won't work loose if properly torqued.

 

I will assume you cleaned and lubed the splines too.

Make absolutely sure you are tightening it down initially at least with the wheel elevated. If you do not the inner and outer splines will cock against each other instead of seating on the taper. If that happens you can torque it to 1000 lbs and it will not be tight.


Sinch down elevated till tight. put it down and torque it. Drive a few miles and retorque. If you are doing all that it should not be a problem.

 

I would take it off and look for debris or anything that prevented the convex and concave tapers from seating well against each other. Then reinstall with the wheel elevated and tighten. Drop it and retighten. Drive it and retighten.

After the drive I really only retorque as a fail safe. If everything was good the first time they will not really move on the retorque.


Also are you torquing them or just using the wrench and hammer?

When using a torque wrench I find I really need someone to sit in the car and hold the brake very hard.


I have used the wrench and hammer many times and it does work OK but it is hard to quantify how tight tight is.

 

With the size and depth of those threads I would be very surprised.

Start from scratch and give it another try.


Sorry about the snow.....it is 85 here.

 

It might be useful to mark a line across the nut/wheel to see if it is coming undone or are you just tightening it further each time. If it is coming undone then it sort of implies it was not tight enough to begin with. If you need to just keep on turning the nut further then something is being crushed out of the way, (threads about to strip?).

good luck

 

Is it possible that the wheel wasn't all the way pushed back on the splines or that the splines had a slightly damaged area that didn't allow the wheel to slip all the way back?

I don't know if you have, but I would take the wheel off entirely, then slide it back on the splines 90 degrees rotated from where it was - then try tightening it again.

 

I've never heard of that happening

Normally if the inner piece was stripped, taking the wheel nut completely out would reveal metal shards on the threads.

 

It is possible someone tried to loosen the bolt on the RR by turning it the wrong way. The LR comes off CCW and the RR comes off CW so someone could have turned it the wrong way and with a big wrench cracked the bolt. The crack forms in the valley of the uppermost thread and you can only see it by a water emulsion floresent penetrant test. Don't ask how I know this. A new bolt is like $700 but they are available. Be very careful driving the car until this is checked out. Also, get the Hill Engineering socket to fit the bolts from Ricambi....it is a thing of beauty YMMV.

Jeff Pintler
89 348tb, 86tr

 

I have seen cracked bolts but never a damaged female thread.