[DeTomaso] Driveshaft bolts--the final answer

Pantdino pantdino at aol.com
Sat Dec 31 00:26:16 EST 2011


So it was just by dumb luck I did it right when i replaced my halfshafts!!  50:50 chance, after all. :-)

Jim



-----Original Message-----
From: thomas <thomas at hax.se>
To: MikeLDrew <MikeLDrew at aol.com>
Cc: detomaso <detomaso at realbig.com>
Sent: Thu, Dec 29, 2011 1:01 pm
Subject: Re: [DeTomaso] Driveshaft bolts--the final answer


I have a huge bag of bolts from Aircraft Spruce since I switched to CV-joints 
nd initially bought the wrong length bolts, and I just compared them to my 
tock bolts, and I get them both to .437", measured both with a digital caliper 
nd an old micrometer. I get no repeatable difference between the bolts.
Thomas
29 dec 2011 kl. 21:11 skrev MikeLDrew at aol.com:
> Hi guys,
 
 Got this from a well-known auto engineer and Pantera owner who chooses to 
 remain anonymous, but said I could repost this for him:
 
 ====
 
 Mike,
 So I get an e-mail from a P-car owner here in Detroit, that asks me what is 
 my take on the half shaft bolt thread on the forum. I tell him I don't read 
 the forum but for him I would look at the conversation.
 
 So - which way do the bolts go in at the ZF. Nuts to the inside or nuts to 
 the outside. ???
 
 Some people got the answer right, but nobody got the reason. NOBODY.
 
 The bolts should go in with the nuts to the inside. Reason - - the counter 
 bore in the companion flange on the ZF is slightly smaller than that of the 
 counter bore in the half shaft. Just enough that the tips of the hex dig 
 into the radius of that counter bore. When the bolt is installed with the nut 
 to the inside, the counter bore in the half shaft flange is just large enough 
 to clear. So - you ask "what about the nut? Won't its hex tip dig in the 
 same? After all - it is also a 5.8" hex."  Yes  EXCEPT the SPECIAL lock 
 washers that go on that side elevate the nut enough to clear the counter bore. 
> These are not standard lock washers. They have a much smaller diameter and 
 whole lot more thickness.
 
 Your answer sir.  :-))))
 
 Of course, the only sample of this phenomenon that I have to work with is 
 MY car. As such, this is what I base my evaluation on. Other peoples (yours) 
 may be different. If you look closely, (again at least on mine) the hex tips 
 will dig into the radius of the counter bore on the ZF flange and the axle 
 companion flange. Not only does it create a stress riser, but it inhibits 
 the tensile load from being distributed in a uniform fashion over the flange 
 seat. On the other side you really should use the designated lock washer. It 
 really does elevate the nut so its hex tips are clear of the counter bore. 
 Yes - you should use nylock nuts. Note: A.N. bolts are equivalent to grade 5. 
 Ductile - not hard. They take shear loads without breaking. (well - some 
 people can break an anvil)  :-)))) At these harnesses they are also very good 
 at tensile loads. I suspect NOBODY has actually torqued their nut/bolt. I 
 would estimate they could take 80-100 ft/lb no problem. I did it once before a 
> long road trip, to 70. Not easy to get to. I probably did not get it exact.
 
 Also - A.N. bolts are (by design) slightly smaller than the designated hole 
 size. i.e. 7/16 = .4375"  The bolt shanks are .4330 to .4370. You ~could~ 
 sort through a bin of them and probably find the required number of 'high 
 end' sized bolt. IMHO - not worth the time.
 
 http://www.zenithair.com/kit-data/ra/an.html  For reference.
 
 ====
 
 So, there you go!
 
 Mike
 _______________________________________________
 
 Detomaso Forum Managed by POCA
 
 Archive Search Engine Now Available at http://www.realbig.com/detomaso/
 
 DeTomaso mailing list
 DeTomaso at list.realbig.com
 http://list.realbig.com/mailman/listinfo/detomaso
 
 !DSPAM:4efccb33277911562831224!
 
______________________________________________
Detomaso Forum Managed by POCA
Archive Search Engine Now Available at http://www.realbig.com/detomaso/
DeTomaso mailing list
eTomaso at list.realbig.com
ttp://list.realbig.com/mailman/listinfo/detomaso




More information about the DeTomaso mailing list