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Case Tractors Discussion Forum
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DC woes

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Jon Holt

09-12-2006 20:48:41




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A friend of mine has a DC4 and it has been sitting for about three years. I overhauled the carburetor and put new plugs, wires, points, condensor, cap and rotor. We cleaned out the gas thank and put in fresh gas. When we got it started and tried to adjust the carb it would run a little rich, would idle up and down. It wouldn't smooth out and run at a steady rpm. I also noticed that it was not running on all four cylinders. Checked the plugs and 3 and 4 cylinders were not contributing. Pulled the plugs and they were wet. What should I check now. He said it ran good before it quit and he messed with it for a while then gave up. It also cracked the block right behind the carb. Any help would be greatly appreciated. Thanks. Jon Holt

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C. Amick

09-13-2006 09:34:24




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 Re: DC woes in reply to Jon Holt, 09-12-2006 20:48:41  
Check for stuck valves and bent push rods. I doubt that the crack is your problem, but you might also check the bottom of the oil pan for coolant. If it would happen to be leaking into the cylinders, it should show up there.



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Ken in AZ

09-13-2006 08:24:24




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 Re: DC woes in reply to Jon Holt, 09-12-2006 20:48:41  
You mentioned a cracked block at the carb and 2 rear cylinders not running... first and easiest is to swap the wires on the back 2. Next would be to check the intake manifold for leaks. I've used a propane torch as a fuel source; you can also use starting fluid. Apply fuel around the manifold and see if the engine picks up or fires on the dead cylinders... it can add enough to get them to fire and help you find the leak.

Hope this helps.

Ken in AZ

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jal-SD

09-13-2006 06:49:33




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 Re: DC woes in reply to Jon Holt, 09-12-2006 20:48:41  
You didn't get a couple of wires reversed when you replaced them did you(BT,DT)? Had a similar problem w/SC, fought it for a while, nephew came along & said did you check the firing order - walla, fixed the problem. (My $0.02 worth. jal-SD)



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Paul f

09-13-2006 06:16:20




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 Re: DC woes in reply to Jon Holt, 09-12-2006 20:48:41  
Have you checked for compression in the 2 non working cylinders? Could be stuck/non seating valves...no compression mixture may not ignite ( I assume by wet you meant gas not oil



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