Re: Am I Just Lucky?

[orin@netcom.com (Orin Eman)]

> 1)  To break my crank bolt loose, I used a 2 foot extension on a 
> 1/2" drive breaker bar.  It took a good stout pull, but that was all. 
> Am I just lucky??  I figure that at the end of a 2-foot extension, I 
> can pretty easily apply 300 lbs/ft of loosening torque.  I had a 4-
> foot pipe rady to use, but didn't need it.  (I plan to use it when 
> putting the bolt back on.)

I did use the 5' pipe to break it loose, though I was pulling upwards
meaning I would be putting considerably less than my weight on it...

> 2)  My Bentley specifically shows the torque on the crank bolt to be 
> 258 lbs/ft., or 350 n-m.  I have heard specs of upwards of 300 foot-
> pounds quoted for this.  Unless there is a heckuva lot of variation 
> of torque specs from year to year on the I-5, someone is overtorquing 
> their bolt, according to my sacred "Book o'Bentley".

For the 84-88 5k, the Bentley shows an extension tool (2079?) which is
approximately 12" long.  The given torque spec was for use with this
tool only.  Assuming a torque wrench of around 18" length, we calculated
the torque at the bolt to be 400 - 500 ft-lb!

> 3)  I hear a lot of discussion about using Loctite on the crank 
> bolt when re-installing it.  BUT: the Bentley in section 13.4 
> specifically says that when re-installing the crank bolt, the 
> threads should be coate with "Anti-corrosion compound AMV 188 1 00 
> 02".  Unless this is Loctite under a proprietary name, it sounds to 
> me more like they are recommending use of a compound like Anti-Sieze 
> than something which locks the threads.  And for that matter, I don't 
> think I need to worry much about a bolt torques to 258 lbs/ft coming 
> loose just because it has a bad day.

The older Bentleys talk about a locking compound, hence the confusion.
I hadn't heard the Anti-corrosion discussion when I did mine, so I
used loctite.

Orin.