M62 nosedrive stud - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-25-2007, 10:00 PM   #1
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Default M62 nosedrive stud

The long stud from the nosedrive that bolts to the tensioner bracket should I worry about anything if I drive without this stud in for a day or two?

Why I ask:

A couple weeks ago I noticed the nut on the stud was loose...not even close to the bracket.
I knew I had tightened it when I put everything back together after doing all the gaskets. Yesterday before driving home from Bill'* I noticed it was loose again. I tightened it but it would NEVER torque down, it just kept turning.

After driving to and from work today, I popped the hood, and saw that the nut had loosened all the way to the tip of the stud. I started to use a different nut, but when I did it was too tight, and the stud started turning. After removing the stud completely there was some metal within the threads.

I haven't tried putting the stud back in yet, I don't know if the threads are messed up where the stud enters the nosedrive. The SC is completely torqued down to the LIM (obviously) so I don't see leaving the stud out causing a problem.

Can anyone confirm?
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Old 06-25-2007, 10:02 PM   #2
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Mine did the same thing. So I replaced it with a slightly larger diameter bolt.
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Old 06-25-2007, 10:18 PM   #3
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I figured I'd try putting this one back in. If I have no luck I will try a larger.

Should I drive without the stud installed? At most the tensioner bracket would move a little I'd think, if even that. The SC isn't moving at all.
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Old 06-25-2007, 11:38 PM   #4
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It'* not for the SC, it'* for the bracket. Additional support I suppose.
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Old 06-25-2007, 11:49 PM   #5
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I had one stripped on the Nosedrive I just installed in the Zilla. I heli-coiled it back to an M6 (refer to Zilla'* winter rebuild) and installed a BOLT rather than a stud.

You really need to do the same. There'* alot of stress applied to that accessory bracket.
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Old 06-26-2007, 08:27 AM   #6
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I'd like to suggest we consider tossing up a torque spec on this stud to ensure members aren't over torquing them.

Being steel into aluminum...I realize the corrosion/welding effect probably plays into this as well.

Pete..I have a right angle drill if needed.
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Old 06-26-2007, 08:33 AM   #7
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Off to work now...I'll try to install the stud before I drive.

EDIT: Put the stud in, couldn't get the nut to stay so I kept it off. The stud tightened by hand, but when using a ratchet to try and tighten the nut on, the stud came loose, so I'll have to get it re-threaded.
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Old 06-26-2007, 02:49 PM   #8
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I looked at your thread Bill....can you explain the importance of the heli-coil? Not too familiar.
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Old 06-26-2007, 03:12 PM   #9
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It'* a steel thread insert to repair stripped threads. The kit comes with an oversized drill, tap, thread insert, and installation tool.

It was either an M6 or M8. Can't remember now.
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Old 06-26-2007, 03:40 PM   #10
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Gotta be M8.
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