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Torque wrench specs

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Hank

08-01-2001 08:19:20




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I recently received a spec for torquing the head bolts on an 11 hp engine as 165 inch pounds of torque.
is this the correct spec and is an "inch pound" the scale normally used on my craftsman torque wrench?




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Nolan

08-01-2001 11:42:52




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 Re: Torque wrench specs in reply to Hank, 08-01-2001 08:19:20  
A head bolt torque that low, and given in lb/inches? I'm going to say that I'd be skeptical of the number, and would double check.



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big fred

08-01-2001 21:09:28




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 Re: Re: Torque wrench specs in reply to Nolan, 08-01-2001 11:42:52  
That's about right for his 11 HP engine. They are built with the threads tapped directly into the aluminum and use pretty small bolts. Best to be careful not to overtorque or you get to do a helicoil job on your engine. BTDT :o(



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John in MA

08-01-2001 10:17:14




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 Re: Torque wrench specs in reply to Hank, 08-01-2001 08:19:20  
The vast majority of torque wrenches are foot pound. You're the one with the wrench, so look at it yourself to know what it is.

Just divide the inch pound number by 12 to get foot pounds.



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Skinner

08-03-2001 04:22:03




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 Re: Re: Torque wrench specs in reply to John in MA, 08-01-2001 10:17:14  
John is correct about dividing inch/pounds by 12 to get foot pounds, however you must be very careful as the majority of the torque wrenchs in foot pounds have a very light click or "break-over" when set that low. I have torque wrenchs that range from 10 inch pounds to 1200/ftLbs. While my inchLb wrench was out for calibration, I used my little 3/8" drive footLb wrench to torque some bolts on my Harley (in inch lbs). The torque wrench goes down to 10 ftLbs or 120 InchLbs, so I tested my wrench at 120 inchlbs to get the feel for it first, and the indicator or click is very, very slight and you have to pull very gently and pay very close attention. Using an torque wrench in inch pounds is much more accurate since your normally higher on the scale then using one maxed out or at the smallest portion of the scale, but it's close enough to do what most of us need to do. The worst part is, your below what "most" footLb torque wrenches go to unless you own a very small 3/8 drive wrench. Most of the common 1/2" drives start at 20 to 30 footlbs.

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Dell (WA)

08-01-2001 11:00:01




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 Re: Re: Torque wrench specs in reply to John in MA, 08-01-2001 10:17:14  
yep, and when they told me the "nut" that held the front fan on the Pratt & Whitney PW2037 jet engine on the Boeing 757 was torqued to 3.2 Foot/Tons, I was impressed. Takes 3 stages of geared multiplication and a 1/2" air drill whinning away for about 8 hrs to get there..... ..Dell



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Dean

08-01-2001 09:16:50




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 Re: Torque wrench specs in reply to Hank, 08-01-2001 08:19:20  
Nope, they make inch-pound torque wrenches just for that purpose.



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Noel

08-02-2001 10:17:06




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 Re: Re: Torque wrench specs in reply to Dean, 08-01-2001 09:16:50  
John is correct. Not all of us have the cash flow to permit as full a tool box as we would like. Besides that, it is important to understand the relationship between measurements as there are times we simply do not have the "correct" tool at hand when needed. Nothing wrong with using a torque wrench calibrated in a higher scale if one is VERY careful and deliberatein its use. Yes, the proper scale would be more accurate and safer, to boot.

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