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Bolt torquing
Posted: Thu Feb 13, 2020 5:27 am
by JW Scud
I hope you are an EAA member to access this video. Between 27 and 41 minutes is quite interesting.
https://www.eaa.org/videos/613012040700 ... hNNStyOCJ9
Re: Bolt torquing
Posted: Thu Feb 13, 2020 2:59 pm
by Colonel
Everybody thinks torque is the final answer, but it's just a crappy proxy for tension.
What you need to know, is that there is a HUGE difference between wet and dry threads.
Re: Bolt torquing
Posted: Thu Feb 13, 2020 3:04 pm
by Slick Goodlin
Just break it then back it off a quarter turn.
Re: Bolt torquing
Posted: Thu Feb 13, 2020 4:24 pm
by Colonel
The hilarious thing is the noxious mixture of arrogance and incompetence
that the bendy/clicky torque wrench crew display. The actual torque they
are applying, after a couple years and a couple drops on the floor, is a whole
lot different than what they think.
I knew a motorcycle guy in Ottawa. Broke all the bolts off his rear sprocket
with his expensive torque wrench. Looked up the wrong value. But I have
to ask - why didn't he stop after the first one broke? Why did he break them
all? I guess if you have an expensive bendy/clicky torque wrench - no names
mentioned, Snap-On Snobs - you can do
no wrong.
Torquing is performed so poorly, Mike Busch doesn't like to see mechanics
change cylinders in the field. They can't do it. He prefers that the engines
be removed and sent to a shop, who can actually properly torque the through
bolts.
PS You like my new jacket?
Pro Tip: Replace any fastener which has been permanently plastically (as opposed
to elastically) distorted from it's original dimensions.
Re: Bolt torquing
Posted: Fri Feb 14, 2020 1:29 am
by Slick Goodlin
Aw, but my clicky wrench makes me feel like a real mechanic.
Re: Bolt torquing
Posted: Fri Feb 14, 2020 3:43 am
by Scudrunner
What you need to get is a metal pipe about 6 feet long and slip it over the end of your wrench and just giver.
Growing up the 25 year old guy who lived in his moms basement (Identified as a millennial circa 1990), well he woke up one morning and decided to start buying "classic" cars here in Canada and ship to his cousin in Europe to sell and make a fortune.
Turns out Europeans don't pay premium prices for pieces of shit full of bondo either.
But it offered endless entertainment to the neighborhood boys watching him try and "fix" cars.
His tool box was full of busted sockets and wrenches he used his pipe on to "help" loosen a bolt.
One day my brother took a closer look in his tool box and they where all Craftsman
he asked if he could have them.
"sure they are busted anyway"
Ten minutes later we are speeding down the King George Highway in my brothers 78 Chevette as he explained Sears Guarantees all their tools and we can get new ones.
Guy at Sears was awesome, still think my brothers got the socket kits we got in exchange to this day.
Re: Bolt torquing
Posted: Fri Feb 14, 2020 3:23 pm
by Colonel
a metal pipe about 6 feet long
Reminds me of putting the prop nut on a 1340. It needed 10 million lb-ft of torque or something ridiculous.
Re: Bolt torquing
Posted: Fri Feb 14, 2020 3:47 pm
by Liquid_Charlie
We could never figure out if it was a 200lb man on a 4 foot bar or a 4 lb man on a 200 ft bar
Re: Bolt torquing
Posted: Fri Feb 14, 2020 3:50 pm
by Slick Goodlin
Colonel wrote: Fri Feb 14, 2020 3:23 pm
Reminds me of putting the prop nut on a 1340. It needed 10 million lb-ft of torque or something ridiculous.
The retaining screw on the wheel bearings on my VW are spec’d at something like 560lb•ft
plus 180°. That has to be infinite pound feet, or more correctly just replace the whole damn corner.
Re: Bolt torquing
Posted: Fri Feb 14, 2020 10:11 pm
by Chuck Ellsworth
I find the best example of torque is when I wake up in the morning with a raging hard on and I have have a morning piss I have to push down on it so hard my heels come off the floor.