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Head re-torque question

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snowmantn

07-16-2002 00:00:37




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I was wondering on my '51 model A how long or to what temp should the engine be run before the re-torque. I know these late A's and 60's are a little more prone to gasket failures than other models. Any details would be appreciated.

snowmantn




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Bill Hires

07-16-2002 16:20:52




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 Re: head re-torque question in reply to snowmantn, 07-16-2002 00:00:37  
A fine John Deere mechanic taught me the method I use for retorquing 2-cylinder heads back in the fifties. With my membership in Murphy's club I still have never had a coolant leak around the studs. I used to know some John Deere mrechanics that would not use the lead washers.



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Clooney

07-16-2002 12:48:19




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 Re: head re-torque question in reply to snowmantn, 07-16-2002 00:00:37  
Snowmantn, I personally like to give them a few heating & cooling cycles before re-torque.
~I differ from Bill on backing the nuts up though & never back the nuts up before re-torque as I believe that can cause a problem with the lead washers not functioning. ~After a couple of heating & cooling cycles I get the engine hot preferably by working a little then pull the rocker cover & adjust the valves, by then it has cooled enough to re-torque the head nuts. If the rocker shaft is in the way of re-torque, I either pull the rocker shaft or if I can get a box end wrench in there I will use that & tighten until those nuts feel like the others. I have a good feel for proper bolt torque though..

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snowmantn

07-18-2002 03:41:15




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 Re: Re: head re-torque question in reply to Clooney, 07-16-2002 12:48:19  

Thanks Clooney, I would rather run the engine through some heat and cool cycles because the cylinder block was repaired and the engine has new rings and fresh cylinders. Also I am also not very familiar with the way this particular tractor runs as I only ran the engine about 15 min. before the previous owners stop leak gave way. Thanks again!
snowmantn



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Bill Hires

07-16-2002 06:00:49




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 Re: head re-torque question in reply to snowmantn, 07-16-2002 00:00:37  
I run the engine for a minimum of two hours, back off the nut and retorque to 125 lbs. ft. Start with the center retainung stud nut and working outward.



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