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Case Tractors Discussion Forum
Show Parts for Model:

Low idle hunting / surging

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Dodgeit

02-04-2013 08:40:16
65.199.61.227



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Finally have the 'ol 711 running after a freshening up of the engine. Sleeves, Pistons and rings. Along with a valve job.
She purrs like a content cat @ 800 rpms or higher. Just below 800 and she wants to hunt. Much below 700 and she will not stay running. Not too worried about that, since the rings haven't had a chance to seal yet.

Just wondering about the hunting? No amount of adjust to the carb (idle rpm adj. screw or idle mixture screw) seems to make a difference.

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D G Wells

02-04-2013 17:46:18
69.6.131.161



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 Re: Low idle hunting / surging in reply to Dodgeit, 02-04-2013 08:40:16  
Dodgeit, You have received a lot of good feedback and there are a lot of things to look for. But I did not see anyone mention a worn out butterfly shaft. If the throttle shaft lets in too much air where it goes through the carburetor body, the air adjustment screw will never adjust out like it should. You must replace the shaft to stop that excess air intake.---
Derrol in Texas---



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Dodgeit

02-05-2013 08:57:43
65.199.61.227



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 Re: Low idle hunting / surging in reply to D G Wells, 02-04-2013 17:46:18  
Thanks Darrel. Carb is in order.It's the shaft adjustment that needs addressing.



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Gene Dotson

02-04-2013 12:17:07
69.88.222.62



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 Re: Low idle hunting / surging in reply to Dodgeit, 02-04-2013 08:40:16  
Set your governor to carburetor rod. With engine off and throttle wide open, need to adjust the governor rod for 1/16 inch from wide open stop.

Gene



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Dodgeit

02-04-2013 15:53:43
99.95.158.210



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 Re: Low idle hunting / surging in reply to Gene Dotson, 02-04-2013 12:17:07  
Quoting Removed, click Modern View to see

Gene, thanks for that suggestion. This is a pulling tractor, so the rpms are a bit higher than stock. Is the adjustment still the same at 2200 rpms as it is at 1650? Or set it at 1650 and it's set for upper rpms as well?



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dboll

02-04-2013 16:46:25
209.23.168.127



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 Re: Low idle hunting / surging in reply to Dodgeit, 02-04-2013 15:53:43  
length of the rod has very little or nothing to do with rpm's, spring tension overcoming the governor weights does, shortening the rod a little at a time should cure it



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old

02-04-2013 09:35:02
209.86.226.40



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 Re: Low idle hunting / surging in reply to Dodgeit, 02-04-2013 08:40:16  
Does choking it help or hurt the surging?? If it helps then the idle screw needs to be screw in more since it works back wards of the main jet as in in to make richer out to make leaner. If the adjustment does nothing then good chance the idle circuit of the carb is clogged up



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Dodgeit

02-04-2013 10:03:08
65.199.61.227



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 Re: Low idle hunting / surging in reply to old, 02-04-2013 09:35:02  
Quoting Removed, click Modern View to see

Thanks old. I was going the wrong way with the idle circuit screw.



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old

02-04-2013 10:08:08
209.86.226.40



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 Re: Low idle hunting / surging in reply to Dodgeit, 02-04-2013 10:03:08  
That is why I said something. Few people know that you open up the idle adjustment for more air instead of more fuel so they play with things and get it wrong. So just remember 99% if the idle screws are out for lean in for rich



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j hikemper

02-04-2013 09:10:13
50.102.70.24



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 Re: Low idle hunting / surging in reply to Dodgeit, 02-04-2013 08:40:16  
mark your current timing ,, then tinker with timing, after warmed up. make sure points are set rite .. and valves ,... new engine will need a little run in..after a few hours run , reset your valves andretorque heads WHILE WARM



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