Big differance between 81 & 155 lb ft, which is correct? I've got a set if AC Delco's that I purchased for when I do replace them, would be nice to know the correct lb ft to use. I was told in the past it was 81 lb ft, hub bolts to 85 lb ft.

 

155 Ft. Lbs. is the correct spec, and don't re-use the nut, get a new one

 

I've already got the nuts and the 30mm socket. Everything I've seen in the past, including chiltons stated 81 lb ft for the axle nut. Now this 155 lb ft is mentioned. Seems like if it is only 81, then 155 would damage it. But on the other hand, if it's supposed to 155, then 81 would not be tight enough.

So where is this 155 coming from? What referance?

Here is Chiltons.

 

The only place in Mitchell 5 where I see 81 ft.lbs. is in the hub assembly section for 2006 HHR. In the axle repair sections it is 155, for all other year HHR's it is 155 and for the Cobalt it is 155, all years. I went through this process when I replaced mine last year and I can tell you that the factory nut is on with 155, no where near 81. And if GM changed the spec there would have been a TSB and I found none.

 

I just checked the GM shop manual for a 2006 - it too refers to 155 lb ft (or 210 N.m). Also noted that it refers to using a drift or punch inserted thru the back side of the caliper into the rotor, to keep it from turning when removing the axle nut. And would work when installing the nut as well I assume.

 

Well thanks for the info, amazing how big a differance different referances tell you.

 

That's how we do it in the junkyard - jam a large screwdriver through the top of the caliper and as far into the cooling fins on the rotor as it'll go. The only danger is if it snaps! You're likely to go for a tumble.

 

the other way, is to tighten it up till it strips..... then back it off 1/4 turn!! *G*

 

I DO vaguely remember that my first new set of front hubs had an insert that said that there was a "new" torque setting, don't remember what it was. I don't really see why it would make a difference, the thru axle goes metal/metal/metal vs. metal/bearing/metal, I hope that made sense; The axle goes thru the inner race, so you are torquing between the end of the CV and the thrust washer |-| like that not ||-||. Words are sooo hard.

If it is too loose you might loose a wheel, if it's too tight it's the next guy's problem. I do notice that there is a burnishing on the inner collar of the old bearing.

 

So, what part of "2006 HHR Service Manual" does not provide a reference?