Hey all. I'm currently working on a 2008 Mercury Mariner, 3.0L AWD. I'm replacing the center support/bearing as well as both u-joints on the rear driveshaft. (Word was the center bearing wasn't replaceable...turns out it was AND I got the part from Ford...but that's another story.) I separated the two shafts, got the yoke off the half with the bearing, and got the old bearing off. After cleaning everything up, I put the new bearing on, which went on much easier than expected. I've got the yoke back on and am tightening down the lock nut. The problem is I cannot for the life of me find a torque value for that nut. Since it's supposedly "not replaceable and you have to change the whole shaft out" all the information I'm finding deals with swapping the whole shaft. Does anyone have access to what that torque value might be? Thanks!

 

In the absence of anything else you could just use similar tools and power to replace as to remove it, unless unusually rusted that should get you in the ballpark.

So if you used an air wrench to remove it, rattle it back on, maybe at a setting lower.

The other way is to check the size of thread, there may be some torque tables based on that.

Is the nut just torqued or is it also staked or somehow locked in place?

 

I used my impact. I didnt torque mine. I bought a dorman one off rock auto.

 

It appears that it is a locking nut of some sort, so that's reassuring. I'm just concerned about over tightening since it's up against a bearing. And being that it's a locking nut it should be okay if it's not quite tight enough, but I also don't want to have an issue with the driveshaft going down the road.

 

I'm assuming everything is fine with it? How long ago did you do yours? No issues with the bearing going bad again?

 

If a similar size I'd go with similar torque to the Driveshaft hub nuts, similar bearing, loads and size...

 

Driveshaft hub? You mean wheel hub?

 

Yep - but technically that nut is on the end of the CV joint on the driveshaft, sorry UK terminology :-) I call the shaft you've been working on a prop shaft Lol

 

Mine was good for 2 years then I traded it in. Still running great.

 

Ah! No worries. Good to learn something new! I didn't know it was called anything different elsewhere. The shaft from front to back I call driveshaft and then you've got axles out to the wheels.

Good to know! I'm not really expecting it to go bad, but wanted to do my due diligence to make sure I wasn't messing something up.