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JD A head

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Matt

01-11-2003 19:54:48




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need head torque spec. for 46 jd a




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Gordon

01-12-2003 19:11:47




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 Re: JD A head in reply to Matt, 01-11-2003 19:54:48  
I am afraid of over torqueing the 2cyl waterloo heads because I saw the blocks crack at the bottom of stud in 1 1/2-2 years of runing.



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Lee

01-11-2003 21:05:19




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 Re: JD A head in reply to Matt, 01-11-2003 19:54:48  
IT manual states 125 ftlbs for non-heat treated studs and 150 ftlbs for heat treated (black) studs, but if you'll do a good search in this group you will find many who don't stop till they hit 200 ftlbs and a few recommend grade 8 bolts instead of studs. I'd put 200 ftlbs on a grade 8 bolt, but I'm a bit fearful of doing the same to the less hard original studs.

I quit at 125 ftlbs and had some bubbles in the water and antifreeze smell for the first three starts, but that's gone away now. So next time maybe I'll spring for the grade 8 bolts...

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gene

01-11-2003 23:33:47




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 Re: Re: JD A head in reply to Lee, 01-11-2003 21:05:19  
i torque mine to 150 lds starting at 50 an goin in squenice through it tighting order working my way up to the 150 mark. after i run it for the first time then i retorque while the engine is hot. have never had a bit of trouble.
johndeeregene



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Lee

01-12-2003 21:25:09




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 Re: Re: Re: JD A head in reply to gene, 01-11-2003 23:33:47  
Gene, that's the exact correct technique and I would have gone on up to 150 ftlbs and done the warm re-torque too but as Gordon reports, mine had prior toubles with a cracked block in three places - each one was a stud hole. I didn't want to do the same thing as somebody else did to her before I got there! I was also following the machinist's advice on the maximum torque.

Appearently we also need to worry about 'soft' nuts as well as 'soft' studs yeilding. The grade 8 bolts would remove both possibilites at one shot. And I wonder if my prior problems were cause by someone going out of sequence or directly to 150-200 ftlbs - but I'll never know that one way or the other.

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