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Farmall & IHC Tractors Discussion Forum
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tightening bolts

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Jim

11-19-2003 15:15:28




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ok, im going to ask the dumb question of the day. People are always talking about not overtightening bolts(especially when gaskets are involved). How do you know how much is too much? It usually doesnt tell you how many lbs of torque. Plus..hacks like me just grab a box end wrench and start cranking. So whats the simple answer? Is there a rule of thumb?




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Bill Smith

11-23-2003 18:16:41




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 Re: tightening bolts in reply to Jim , 11-19-2003 15:15:28  
As Rob stated, you should be able to find a chart someplace that will indicate torque specs for various sized bolts. Remember that a bolt that takes a 1/2 inch wrench is not a 1/2 inch bolt. Wrench size for the bolt refers to the head of the bolt and not the threaded shaft part of the bolt. So 1/2 inch bolt refers to the threaded part of the bolt and not the head which would likely be a couple sizes bigger like 5/8's or so. So when torqueing with a 5/8's the actual bolt size would more likely be 1/2. You can buy an el cheapo torque wrench for like $20.

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Rob H

11-19-2003 17:09:37




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 Re: tightening bolts in reply to Jim , 11-19-2003 15:15:28  
When you are talking about over tightening valve cover gaskets or other gasketed surfaces which do not have a torque spec. I always back off my tightening even more than normal. A valve cover just needs to be very snug or the light metal will warp and lead to leaks. I don't know about you but I always find a few new swear words when I do something dumb that makes a new gasket starts leaking.



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Rob

11-19-2003 15:49:47




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 Re: tightening bolts in reply to Jim , 11-19-2003 15:15:28  
Go to www.engineersedge.com , then click on "torque design" Pretty good explanation, plus several torque charts



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Rob

11-19-2003 15:33:42




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 Re: tightening bolts in reply to Jim , 11-19-2003 15:15:28  
Rule of thumb is - use the right size tool for the job. Don't put a two foot breaker bar on a 3/8' bolt. Generally, using a standard box end wrench, you shouldn't tighten so much that you are straining yourself. The longer the wrench. the more torque you will apply with the same amount of force. That's why wrench sets have different lengths according to size. If in doubt, you can find a standard torque chart for common size fasteners in just about any repair manual. As you gain experience, you'll be able to use the ol' elbow torque wrench. My joints pop at about 50 ft/lbs. ha ha Hope this helps.

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