Re: must be good luck, right?

["Taru Ross" <taru@domain.elided>]

Straight out of a Haynes manual:

     Thread         Ft-lbs        Nm
       M6             6-9           9-12
       M8            14-21        19-28
       M10          28-40        38-54
       M12          50-71        68-96
       M14          80-140      109-154

Standard disclaimers apply, values are for clean dry threads into steel or
cast iron (not aluminum!), and where no values are otherwise stated.

Taru

----- Original Message ----- 
From: "Ian Lomax" <sfalfisto@domain.elided>
To: "Tony Sims" <simstony@domain.elided>; "Alfa Digest" <alfa-digest@domain.elided>
Sent: Friday, April 26, 2002 9:00 AM
Subject: Re: must be good luck, right?


> tony,
> 
> all bolts have a standard "spec" for them. 
> unfortunately i don't remember where my guide is, i
> might have left it at the lawrence berkeley lab, last
> time i used it, but i'll poke around and see if i can
> find it.  a reference chart would be very handy for
> all of us weekend mechanics (or pros for that matter)
> when you can't find a torque spec.
> 
> cheers,
> ian lomax
> 
> --- Tony Sims <simstony@domain.elided> wrote:
> > Had something odd happen tonight, have decided it
> > must be good luck disguised
> > as a PITA.  The replacement for the crossbar I
> > damaged arrived from Alfa
> > Performance Center today, so I headed out to the
> > garage to get the left front
> > suspension reassembled.  Bolted up wishbone arms to
> > the crossbar, bolted in
> > the new lower ball joint, torqued it all together,
> > no problems or quirks.
> > 
> > Crawled under the car and started bolting the a-arm
> > to the cross member.  Got
> > all 4 bolts in the crossbar, got the nylock nuts all
> > started, and snugged them
> > up.  There's no torque spec in my Haynes book for
> > these, but 60 lbs/ft is in
> > the ballpark for the other suspension attachments so
> > that's what I used a few
> > days ago when I installed the right side.  Took all
> > 4 bolts to 50 lbs/ft, then
> > set the wrench to 60 and started around again. 
> > First nut wasn't clicking the
> > wrench after a couple turns, so I just moved to the
> > second one.  Same thing
> > happens.  I reach across the car and slip the torque
> > wrench on one of the
> > right side nuts and give a tug -- "click".  Hmmm...
> > 
> > Put the wrench back on the first nut and give it a
> > couple more turns -- and I
> > feel the resistance drop off -- "%$#!".  Grab the
> > ratchet and back off the
> > nut, finding all threads from the nut now lodged in
> > the bolt.  Inside of the
> > nut is smooth like buttah.  Bolt is unscathed. 
> > Curious now about other nuts,
> > so I start trying to torque them.  The other 3 are
> > headed the same way, so I
> > stop before they strip.  Reach across under the car,
> > slip the wrench on
> > another of the right side nuts and tug -- "click".
> > 
> > My diagnosis -- this car has been wrecked a time or
> > two in its life.  During
> > the repairs from one of these incidents, someone
> > must have over tightened all
> > 4 of these nuts, weakening the threads enough that
> > they failed when I tried to
> > take them past 50 lbs/ft.  I am making the
> > assumption that 60 lbs/ft is not
> > over tightening, but for 10 X 1.25 hardware that
> > doesn't seem excessive.  If
> > anyone has a reference with torque specs I'd be
> > grateful.
> > 
> > What's the good luck part? Well, they failed while I
> > was installing them, not
> > while I was driving!
> > 
> > Cheers,
> > Tony
> > 74 GTV 2000
> > 70 2800Cs
> > --
> > to be removed from alfa, see
> > /bin/digest-subs.cgi
> > or email "unsubscribe alfa" to majordomo@domain.elided
> Yahoo! Games - play chess, backgammon, pool and more
> http://games.yahoo.com/
> --
> to be removed from alfa, see /bin/digest-subs.cgi
> or email "unsubscribe alfa" to majordomo@domain.elided
--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided