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A JD rockers

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Todd

01-27-2001 18:34:15




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I have a 51 A JD that has broken the pulley side exhaust rocker three different times. Rockers have been shimmed in and out maintaining the proper gap, the oiling of the rockers is fine. Just at the end of my rope on a solution.




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Z-bar

01-27-2001 23:33:38




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 Re: A JD rockers in reply to Todd, 01-27-2001 18:34:15  
Todd, why are the rockers shimmed to maintain gap? is the adjusting screw stuck? is it in or out all the way? the rocker assembly should be bolted directly to the head with out shims. The gap is set by the adjusting screw. If only the one gives trouble, it could galding on the shaft. You didn't say how often this happens, or if you just got the tractor, if its just as soon as you put it on and fire it, it breaks, the valve is going in way to far and hitting the piston. Maby some one with more knowlage can help. luck.

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Todd

01-28-2001 09:45:34




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 Re: Re: A JD rockers in reply to Z-bar, 01-27-2001 23:33:38  
I don't set the valve gap by shimming it, give me a little more credit than that. The rocker is not galding on the shaft, it has to run a little while before it breaks. It usually breaks on the top at the base where the shaft goes through



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al

01-28-2001 12:25:47




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 Re: Re: Re: A JD rockers in reply to Todd, 01-28-2001 09:45:34  
It could be that the springs are to long meaning when the coils are compressed in the valve open state they bottom out and there is no room to push anymore,POP!

Though probably especially because it is an exhaust valve.When the valve guides were reamed there was not enough clearance allowed and when it gets hot it expands and momentarily seizes to the guide untill it cools off again.



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