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JD A clunking

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Bob

05-31-2000 12:33:05




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Trying to start JD A for first time in many years by pulling. Was popping a bit on one cylinder when engine locked up. Freed up again with a little rocking, but now there's a faint clunk with each rotation of flywheel. Compression is still good in both cyls. What should I look for when I open her up?




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Jim

06-01-2000 07:57:24




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 Re: JD A clunking in reply to Bob, 05-31-2000 12:33:05  
I would not run the tractor any more . You need to pull the cover and check the rod and main brgs.
I'll bet one of the rod brgs. was dry and and spun when you pulled the tractor.



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clooney

05-31-2000 17:00:01




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 Re: JD A clunking in reply to Bob, 05-31-2000 12:33:05  
Bob, see if you can get it running for a while, then listen for noises. There might be a rust ring in the cylinders, or a sticking valve, the clunking could be as simple as the play in the cam to crank gears (normal in an old J.D.), or worn wrist pin bushings. Put a quart of motor oil in the gas tank with the gasoline, then get it running & listen for extreme noises & watch the oil pressure. It takes a while for the oil to reach all the areas in an engine. If you hear any death rattles or it overheats, or looses oil pressure then shut it down immediately & investigate.

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chuck mcdonald

05-31-2000 13:26:31




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 Re: JD A clunking in reply to Bob, 05-31-2000 12:33:05  
hey,
its possible that the rod caps on the ends of the rods that hold it to the crankshaft could be loose. You can check for this by opening up the inspection plate on the top of the case. You should check and see if they are torqued to the correct ammount.
hope this helped,
chaz
aka "Tractor Boy"



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dave kolby

06-01-2000 14:53:41




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 Re: Re: JD A clunking in reply to chuck mcdonald, 05-31-2000 13:26:31  
Don't forget the usual things like loose flywheel, clutch etc.

Dave



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