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Restoration & Repair Tips Board

Break-out torque???

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Oldfarmboy Jim

10-20-2004 00:14:48




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I recall that a friend of mine was rebuilding a small block Chevy to put in his 1952 pick'em up truck years ago. Once he got the engine assembled and still on the stand, he put a torque wrench on the crank nut and watched how much torque it took to get the engine to turn. He called it the break-out torque and apparently he had some idea of what the torque would be if everything was assembled right. I wonder if any engine rebuilders have heard of this and where you would find such information for a specific tractor engine. Also, is this a reasonable measure to weed out problems before installing the engine? Thanks for all the great info in advance. Reading these forums and working on tractors sure does keep me out of the pool halls, though. Regards, Jim

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Allan in NE

10-20-2004 05:33:20




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 Re: Break-out torque??? in reply to Oldfarmboy Jim, 10-20-2004 00:14:48  
Hi Jim,

All builders spin the engine just to make sure it is free and ready to run.

There is no spec because each engine is different from another.

His "break out torque" is just something he made up for himself, his way of doing things and his own use.

Do enough of 'em and you soon learn what "feels" right and what doesn't.

Good day to you,

Allan



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Jon H

10-31-2004 10:39:43




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 Re: Break-out torque??? in reply to Allan in NE, 10-20-2004 05:33:20  
When assembling an engine,I turn the crankshaft 1 turn after installing and tightning each rod/main bearing. That way if somthing suddenly makes the engine turn hard or locks it up, you know it is the last thing you installed. sure is a lot easier than trying to find a mistake in a totally assembled/tightned engine.



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Oldfarmboy Jim

11-04-2004 18:30:20




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 Re: Break-out torque??? in reply to Jon H, 10-31-2004 10:39:43  
Thanks Jon H. I'll use that strategy from now on.
Common sense is hard to beat! Jim



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