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Torque Wrench Accuracy- How to easily test

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Old 10-14-2019, 05:31 PM
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Toys4Life C5
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St. Jude Donor '21
Default Torque Wrench Accuracy- How to easily test

Guys, recently I was torquing a bold down on the C5 suspension and I just had that feeling that I was going way too tight and I was wondering if my torque wrench is no longer accurate!

It bothered me - so I found out how to make sure my torque wrench is in fact accurate and now I can sleep at night knowing my repair is correct.

I put together this short video showing the process.

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Old 10-14-2019, 06:29 PM
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leadfoot4
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Good video!

Where I used to work, we had a "calibration lab", that could verify the accuracy of ANY measuring device you could imagine, be it torque wrenches, Vernier calipers, pressure gauges, "jo blocks", whatever. I retired, and miss that "perk".....
Old 10-14-2019, 08:12 PM
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My Vette Life
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Thank goodness i have one with a needle point but also have a modern one which i forgot how to use.
Old 10-16-2019, 10:09 AM
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Stingroo
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Today I learned what a foot-pound actually is.

I should check mine. It's probably scary.
Old 10-16-2019, 02:37 PM
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50thz06
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Good job! Thanks!
Old 10-16-2019, 02:55 PM
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tabbruzz
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Great vid Ken....Now how can I do that with my inch pound torque wrench?
Old 10-16-2019, 03:02 PM
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Gordy M
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Been using that method, 12" and 50 lb weight, for the last 20 years. Do it every January 2 on all my torque wrenches. It is scarry how much some will change in a year and how some have been very consistent.
Old 10-16-2019, 08:50 PM
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Toys4Life C5
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Originally Posted by leadfoot4
Good video!

Where I used to work, we had a "calibration lab", that could verify the accuracy of ANY measuring device you could imagine, be it torque wrenches, Vernier calipers, pressure gauges, "jo blocks", whatever. I retired, and miss that "perk".....
Wow! That is one heck of a cool, albeit unusual, PERK! Did you work for an aerospace company?
Old 10-16-2019, 09:10 PM
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C5 Diag
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We too have a “cal lab” at the airlines since many of the tools have to be super accurate sometimes down to the ten thousandths of an inch !!...took my 40 year old Craftsman torque wrench in for a check up last year and it was still accurate to 1 foot pound...trick to keeping it accurate is DON’T drop it !!
Old 10-17-2019, 07:21 AM
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leadfoot4
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Originally Posted by Toys4Life C5
Wow! That is one heck of a cool, albeit unusual, PERK! Did you work for an aerospace company?
Yeah, sort of.....

Originally Posted by C5 Diag
We too have a “cal lab” at the airlines since many of the tools have to be super accurate sometimes down to the ten thousandths of an inch !!...took my 40 year old Craftsman torque wrench in for a check up last year and it was still accurate to 1 foot pound...trick to keeping it accurate is DON’T drop it !!


It's also important to "zero out" the wrench when you finish using it. I, too, had a 30+ year old Craftsman torque wrench that was also very accurate....right up to the day that it's internal spring reached it's "fatigue point" and broke.

Old 10-17-2019, 08:11 AM
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Jeffs82c3
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I will have to test mine out, I bought it in the seventy's but hardly used it.
Old 10-26-2019, 09:39 AM
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Toys4Life C5
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Originally Posted by Jeffs82c3
I will have to test mine out, I bought it in the seventy's but hardly used it.
Sounds like a good Saturday project!!!

Mine was off by quite a bit and purchased in the early 90's. Easily brought back into calibration though - now I am much more confident when torquing a critical fastener!

Report back the findings if you would!
Old 10-28-2019, 12:44 PM
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mykream
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You said 60 ftlb mark in your video... What bolt was that for?
Old 10-28-2019, 04:37 PM
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Toys4Life C5
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Originally Posted by mykream
You said 60 ftlb mark in your video... What bolt was that for?
Fair question. It was actually the nut for the rear Xmember after installing a new clutch. 81 ft/lbs. Not nearly as tight as the harmonic balancer crank bolt... LOL

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