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Case Tractors Discussion Forum

Rough running SC

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06-20-2007 12:24:32

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Finnaly got my sc to start but,she snorts,caughs,backfires and dies.Have to keep choking it to keep her going.Could it be the valves?Thank`s for any help.

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gary tomaszewski

06-21-2007 07:37:49

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 Re: Rough running SC in reply to Rags, 06-20-2007 12:24:32  
Does it stay running with the choke on? Then it is a fuel problem OR a vacuum leak(manifold to carb or block). Compression check. See valve adjustment.
Valve adjustment. May have sticking valves. Timing.
All part of the fun of reviving our history.

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Just in Case

06-21-2007 05:29:04

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 Re: Rough running SC in reply to Rags, 06-20-2007 12:24:32  
I'd say timing, either mag is set wrong plug wires are wrong or you could as I once had have a worn coupling b/w mag and drive. It drove me nuts trying to find that one, I'd set the timing and it would run fine then start backfiring and popping. Thinking i had set timing wrong I'd reset and same thing. Changed the mag drive assembly and no problems since.

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06-21-2007 03:55:28

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 Re: Rough running SC in reply to Rags, 06-20-2007 12:24:32  
Is it a mag or a distributor machine? I ask this because if it's a mag, and you put new pugs and wires on, you can make the mistake of not realizing that the mags are counter cyclical. If you put the wires on assuming the rotation is the same as the driver of the mag you will be 180 degrees off. Cylinders 1&4 will fire but 3&2 won't. Try switching # 3 & 2 wires and see if it runs. LOL!

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Jeff McBride

06-20-2007 21:10:43

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 Re: Rough running SC in reply to Rags, 06-20-2007 12:24:32  
Have you done a compression check?

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06-20-2007 12:57:59

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 Re: Rough running SC in reply to Rags, 06-20-2007 12:24:32  
Sounds like you have rust impeding gas flow. Check the sediment bowl, fuel line, screen in gas tank, and bowl in carb.

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06-20-2007 17:44:06

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 Re: Rough running SC in reply to watsonsgotit, 06-20-2007 12:57:59  
Ive already checked the items that you mentioned.Every thing is very clean,including the carb.(inside and out.)Just need to know what to check next.Thanks for your input, Don.

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J Heitkemper

06-28-2007 10:04:19

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 Re: Rough running SC in reply to Rags, 06-20-2007 17:44:06  
Hey RAGS THE sc is NOTORIOUS for burning the intake and exhaust manifolds out to were they share gases ,, I have seen that on 3 of the sc that have wandered in here . All acted up just as you say NO MATTER what I did I could not Make EM hit on all FOUR ,, Best Wishes < JIM ,,PS GEORGE MD can make Repairs ,,

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