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Case Tractors Discussion Forum
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DC started knocking and quit

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Tom

07-24-2003 17:31:39




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Got the DC out today to do some plowing. Had not been run for a couple years. Started fine, ran for about five minutes, started to knock, and then it got tight and stopped. Let it cool off and it did the same thing again. Had good oil pressure and was not overheated. Where do I start looking?




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L. Lamp

07-27-2003 20:06:27




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 Re: DC started knocking and quit in reply to Tom, 07-24-2003 17:31:39  
Since the tractor had not been run for a long time, I would change the oil to a 5w-30 for a short time and add Marvel mystry oil to the gas in double the recommended dose for a tank full. This will insure the cylinders get lubrication until the rust is worn away in the cylinders. You can always tear it down if this remedy does not work. Do not run engine at full throttle or use under heavy loads for 10 to fifteen hours. The call is yours.

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Klyde

07-25-2003 05:10:52




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 Re: DC started knocking and quit in reply to Tom, 07-24-2003 17:31:39  
Is there water or antifreeze in the oil?? Antifreeze makes oil pressure but it sucks as a replacement for oil.



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Bruce Nelson

07-25-2003 04:48:43




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 Re: DC started knocking and quit in reply to Tom, 07-24-2003 17:31:39  
Tom, I would be worried that you scuffed a piston. The fact that it cools down and goes again, makes me think that. Especially if it has not run for a few years. Varnish can form in the carb and slightly restrict the fuel passages. This can lean the fuel mixture, greatly raising the cylinder temp (not necessarily the coolant temp.) The extra cylinder temp expands the pistons to where they get too big for the cylinders, causing them to rub against the cylinder walls, seizing the engine and scuffing the pistons. As they cool down, they contract and can move again, but are distorted and unusable.
The fact that your tractor was unused for a time and that it was doing medium to heavy work makes this situation very likely. I would take the pistons put and inspect them. Good Luck.
Bruce

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DC tom graverson

08-02-2003 13:57:43




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 Re: Re: DC started knocking and quit in reply to Bruce Nelson, 07-25-2003 04:48:43  
i will bet that there is a lot of rust and garbage around # 4 and #3 sleeve and no water is around them for cooling. rather common for a tractor that has sat for a long time maybe take head off and try to flush out with hose but best way is to pull the sleeves.

seen it many times on DC



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