anti seize question

[Joe L.]

Re: anti seize question

Jim, In general, yes. There are exceptions, such as ball joints, where the production strategy would be difficult to duplicate in service.

To anticipate your next question, in most cases, the difference in tension between a virgin assembly and the first or second reassembly is small, so if you set your torque wrench to the mean, your tension will still be OK on the reassembly. I wouldn't get in the habit of torquing the reassembly to either extreme of the the torque spec, though, because then the tension change might take you outside the allowable range.

To give you an example of what can happen, some modern finishes have teflon in one of the coats of paint. I tested a bolt thusly finished repeatedly, in the same nut. As the paint layer with the teflon wore off after several runs, the friction changed dramatically. Conditioning these threads would render the production torque spec totally meaningless. This finish isn't on old Corvette, though.

I hope that helps,

Michael------


One problem here is that GM service manuals usually don't specify a torque range (e.g. 40-60 lb/ft). They simply specify a specific torque value (e.g. 50 lb/ft). The AIM's almost always specify a torque range. The specific torque specified in the service manuals is usually right in the middle of the torque range specified in the AIM (for torques shown in the AIM; not every fastener torque on a car is shown).

[Michael G.]

Re: anti seize question

Joe, actually, for repair, tha single value is ideal, because you really don't want anyone to torque a reassembly to the max of the AIM range. We only gave a range in AIM because of the variation inherent in high volume assembly.

[Tracy C.]

Re: anti seize question

Holycrapfellas.....

I can't beleive this thread is still alive. I've always just used a 4way lug wrench and the TFAR method (that feels about right) on my cars for 37 years and never lost a wheel or snapped a wheel stud. Does a duab of antiseize really merit this dribble.....er ah "discussion"??

tc

[Michael H.]

Re: anti seize question

Holycrapfellas.....

Does a duab of antiseize really merit this dribble.....er ah "discussion"??

tc

Yup, we're just gettin er warmed up, Tracy. This subject goes way beyond just wheel nuts/studs.

[Terry M.]

Re: anti seize question

You want to have some fun with this subject -- go over to bobistheoilguy.com. They have been carrying on for years about it. It is almost as bad as DOT3/4 v DOT5.

[Michael H.]

Re: anti seize question

You want to have some fun with this subject -- go over to bobistheoilguy.com. They have been carrying on for years about it. It is almost as bad as DOT3/4 v DOT5.

[Michael G.]

Re: anti seize question

Tracy

I'm sure you meant "drivel", but we got it.

I've been in the automotive fastener business for 30 + years and run into a lot of top-notch engineers who think that any discussion of nuts and bolts is below their level of erudite engineering... Those were usually the guys I had to later help out of their potential recall....

Speaking of 'recalls' one of the most expensive recalls in automotive history (not at GM) involved exactly what we've been talking about for the last few days...someone "screwing" up the friction in a wheel bolt/stud nut joint. It might be worth knowing what you're doing when you lube-up your studs, its hard to steer when your left front wheel is a hundred feet from the car...

I guess I'm done raving about fasteners now. I think I'll stay out of any future discussions of this subject on the forum, so we better end this and get back to that interminable oil discussion...

[Scott G.]

Re: anti seize question

Or missing the right front. That is the one which came off of my brother's 67 BB coupe. As I said above, I have changed all of the studs on my older cars due to what I saw happen on his car. It is not a pretty sight seeing a Corvette slide down I94 on it brake rotor with it's original fender shredded from the wheel coming off.

Lubing or not lubing the threads probability had nothing to do with this wheel coming off. However, unless a person has owned the car since new, we don't have any idea what Bubba has done in the past or how many cycles the studs have seen. In my mind changing the studs is cheap insurance.

Tracy

I'm sure you meant "drivel", but we got it.

I've been in the automotive fastener business for 30 + years and run into a lot of top-notch engineers who think that any discussion of nuts and bolts is below their level of erudite engineering... Those were usually the guys I had to later help out of their potential recall....

Speaking of 'recalls' one of the most expensive recalls in automotive history (not at GM) involved exactly what we've been talking about for the last few days...someone "screwing" up the friction in a wheel bolt/stud nut joint. It might be worth knowing what you're doing when you lube-up your studs, its hard to steer when your left front wheel is a hundred feet from the car...

I guess I'm done raving about fasteners now. I think I'll stay out of any future discussions of this subject on the forum, so we better end this and get back to that interminable oil discussion...