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Author  [Modern View]

08-09-2014 13:46:29

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I just bought another 1950 SC and have been doing normal maintenance, tune ups, and fixing leaks. It starts up on first push of starter button but I am having problems with adjusting the carb. Tractor runs great with no load or in lower gear, but if I try to start out in 3rd or fourth gear it dies. The intake manifold is cold and sweating. I have adjusted the carb to the specs in the Service manual and even opened up the load adjustment about half a turn more. I need some advice from someone more experienced on these carbs and engines. Like I say I own 2 of these SC's and really like them. I am going to make one just for pulling and the other to restore and use around our property. So any help would be greatly appreciated!!!


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wilson ind

08-10-2014 07:54:45

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 Re: CASE SC in reply to jimbob09, 08-09-2014 13:46:29  
Had same thing on engine recently. Weak mag with cracked coil.

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08-09-2014 22:08:32

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 Re: CASE SC in reply to jimbob09, 08-09-2014 13:46:29  
Sometimes a weak spark mimics a lean mixture. My SC carb sweats until it's warmed up even on warm summer days and in the winter it's pure white frost. It's the nature of the beast.

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08-09-2014 20:27:47

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 Re: CASE SC in reply to jimbob09, 08-09-2014 13:46:29  
Check the timing my sc did the same found it had backed off a couple degrees.

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Christopher Mikesell

08-09-2014 20:21:01

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 Re: CASE SC in reply to jimbob09, 08-09-2014 13:46:29  
The first thing that I would check is the governor. If the governor is working properly, I would then check the acceleration circuit in the carb. I would loosen the throttle lever and run the speed up and down quickly. If it doesn't tolerate this, then I would remove the main jet and check the acceleration holes. If it will quickly respond to throttle movements without a problem, I would then check the intake/exhaust manifold for internal leaks by backing off the tappets to close the valves and pressurizing the intake side. If there is a noticeable hiss in the exhaust side, then you have found your problem.

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Christopher Mikesell

08-09-2014 20:43:38

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 Re: CASE SC in reply to Christopher Mikesell, 08-09-2014 20:21:01  
Some sweating on the outside of the intake manifold is normal, especially in humid or cold conditions, and before the tractor has warmed up.

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