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Case Tractors Discussion Forum
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Case SC won't run only backfires!

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Shaips

03-12-2006 11:40:33




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I have a 1948 Case Sc that was running great, then next time I had it running it seemed to run rough then it would clear out and run OK. It got worse quickly and now it will only backfire when I try to start it. It has fire to the plugs, which are new, and I have had the carb off and it looks fine inside. Any suggestions? Thanks for your help




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Shaips

04-12-2006 06:21:17




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
Well I have not had time to do anything with this tractor yet, But I am going to this weekend. How can I tell if the magneto is working correctly? I know it could use a new cap, anything else I should get for it? Where can I find a new cap. thanks



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ben830

03-13-2006 09:25:06




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
Check your Rocker arm shats are tight and didnt come loose. I had this happen to our case LA. It slowly started backfireing and got to the point it wouldnt even start.



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Shaips

03-12-2006 19:11:58




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
My wires are not crossed. I tend to think it must be the magneto like Gene said. I will have to take it apart and look at it. Thanks



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Gene Dotson

03-12-2006 18:20:26




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
My DC acted the same way. The problem was a broken spring in the impulse coupling on the magneto allowing the timing to retard. John Saeli was able to supply me with a good spring and now the tractor runs fine, Thanks John... Gene



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Shaips

03-12-2006 17:11:51




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
Well I am getting plenty of gas, the gas is new. All 4 plugs were cleaned and tested to see if they had spark while cranking the tractor and they did. Whats next? Thanks



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dctom

03-12-2006 17:24:26




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 17:11:51  
you sure somseone didnt cross the plug wires?? sounds like a timeing problem



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mike's600

03-12-2006 18:15:32




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 Re: Case SC won't run only backfires! in reply to dctom, 03-12-2006 17:24:26  
DcTom has it right,somehow you got your plug wires out of sequence.I did the same thing.I was one off the firing order. It would backfire.



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todd hamilton

03-12-2006 16:28:28




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
Check the sediment bowl and fuel line - starving for gas will cause an SC to act like this.



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Casenut

03-12-2006 14:58:38




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
Sounds to me like you have moisture in the distributor or and bad distributor cap?



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stout1

03-12-2006 14:36:03




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 Re: Case SC won't run only backfires! in reply to Shaips, 03-12-2006 11:40:33  
Since I'm not sure how often you use it (no time frame given) I am guessing that you might have bad fuel. New fuels only last about 2-3 months before they "expire" and should be changed. Try new fuel and if that's not it let us know and we'll try to come up with something else.

Michael



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