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John Deere G bent Pushrod

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Gman

08-21-2000 09:05:52




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I'm bending the pushrod on #2 cylinder on my "G" puller and John Deere GM. What am I doing wrong???? Garland




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Dave Wickman

08-21-2000 12:15:57




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 Re: John Deere G bent Pushrod in reply to Gman, 08-21-2000 09:05:52  
Gman, Your problem could be a couple of things. Being you said that this tractor is a puller I will start with the possibility of that if the cam has been altered, the increased valve lift may have caused the valve cap of number two valve to bottom out on the top of the valve guide. The reason it only may be picking on number two valve is that the guide in this location may not be positioned as deep in the head as the others. This can be checked by removing the sparkplugs and valve cover and rolling the engine over by hand and watching for the push rod to flex at the moment where the valve is just about clear open. The other possibility I have seen is if you are running a Powerblock with a flat head there is some push rod clearances problems in the bores that the push rods run in. I have seen that the hoes in the head and the holes in the block that the pushrods run in do not align very well and when the rocker arms rotate the pushrod will come in contact with the block causing it to bend. If you are running tipped rocker arms that is where I would look. Let us know what you find Good Luck, Dave W.

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Gman

08-22-2000 03:13:27




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 Re: Re: John Deere G bent Pushrod in reply to Dave Wickman, 08-21-2000 12:15:57  
Dave thanks for the help,what threw me off was the bent pushrod on #2 on the GM also.



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Mike

08-23-2000 00:31:27




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 Re: Re: Re: John Deere G bent Pushrod in reply to Gman, 08-22-2000 03:13:27  
I have a GM that had the #2 valve sticky and pushrod bent. I straitened the pushrod and frees the valve only to break the tappet. Replaced that and no trouble since. Kind of funny with your 2 and mine all bent the same. Mike



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