On Sat, 28 May 2005 09:47:03 -0400, Denis <denis_roy.RemoveThis@rogers.com>
wrote:
>Why would an impact wrench be OK for removal but not installation? If
>you're concerned about damage to lug nuts during installation if using
>an impact wrench, doesn't the same apply to removal?
Because the torque on the nuts can vary wildly on an air impact
wrench, and isn't consistent enough for safe application. The Pros
can get it fairly close by sound and feel with enough practice, but
even they overdo it and snap off wheel studs. That's why the studs
are replaceable.
I use an impact both ways (now that I have enough compressor to run
it), but when installing the nuts the air is turned way down just to
spin the nuts on and get to an initial 'snug'. Then I break out a
torque wrench (or a hand lug wrench) for the final turn or two.
If the nuts are put it on by hand and properly torqued now, you
should be able to get them off by hand later. But if a gorilla at the
tire shop cranks them on with an air wrench at 5 Zillion foot-pounds
you may end up with a flat tire on the road, the factory hand lug
wrench, and no way to get the (darned) nuts loose. You try jumping on
the wrench, you try a pipe cheater on the handle, you watch the wrench
handle bend like a pretzel... ;-P
And the exact torque isn't critical, 5 foot-pounds either way from
the "ideal" setting isn't going to stop the world. The nuts won't
fall off, especially if you go back a week later and check them again
like you're supposed to. Tripling it, though... <snap!>
--<< Bruce >>--
--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
Spamtrapped address: Remove the python and the invalid, and use a net.<!-- ~MESSAGE_AFTER~ -->
>> Stay informed about: Sienna wheel nut torque