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Case Tractors Discussion Forum
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Case 311 RN Carbarator Woes.

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RJKeith

07-10-2019 07:27:48




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My Case 311 RN Sat for a year until I got around to fixing the PTO. Now I am trying to get it running again, and the carburetor is giving problems. Had it cleaned and rebuilt, new float and complete kit installed, put it back on last night. Still doesn't start. I know it is getting gas to the carb, and I can get it to start and run if I keep spraying starter fluid into it, so the electrical isn't the problem. Any suggestions? At my whit's end, really though rebuilding the carburetor would solve my problems.

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RJKeith

07-15-2019 14:01:02




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
Ok, it runs! Tried what Old suggested and got lots of suction on a wet hand, so no air leak. Then I just started fiddling with the idle needle, power needle, throttle, and choke. Somewhere in there it fired up and kept running. The directions with the kit said power needle one turn out, but I think it was about three turns before it started. Thanks to all who gave advise!



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45cole

07-13-2019 06:56:09




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
Kinda the basics, but they get me all the time; what's the setting of the idle and main jets? Governer and choke hooked up correct? I usually test the needle and seat by putting my lips on the fuel inlet barb and blowing, raising and lowering the floats so I can feel where it is and isn't allowing flow. I have a barb 1/8" fitting I put on the bowl drain and then put a clear hose on the barb and a plug on the other end. Loop the hose over the carb and then pull the plug and it will show you where the fuel level is.

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Ron Sa

07-10-2019 17:25:09




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
How old is the gas?



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R.w.b.

07-10-2019 17:21:12




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
Those needle clips dont fit some float seats i discovered.put new kit in my 411b set float thought all was well.it sat 2 days.wouldnt start black fuel smoke.pulled air cleaner hose lots if gas ran out.took carberator apart ,the clip touches edge of brass seat not letting it shut gas off.tossed it and left gas on all day.air cleaner hose left loose no drips,touched key fired right up



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Joe (Wa)

07-10-2019 10:08:30




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
Pull the plug on the carb bottom to check gas flow to the bowl, should be a steady stream.

Check float setting with the gasket in place.

Joe



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RJKeith

07-10-2019 10:55:43




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 Re: Case 311 RN Carbarator Woes. in reply to Joe (Wa), 07-10-2019 10:08:30  
Good pictures! I flooded it on one attempt at starting when I used the choke, so gas to the bowl.



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casechev

07-10-2019 09:30:02




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
I realize it is a new rebuild......but "gas at the carb".....I have had float needle stick in seat on both 300 and 530. You will have "gas at the carb".....but none in the bowl. A medium tap with a small hammer or pliers on the carb bowl often fixes the problem.



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longcases

07-10-2019 08:56:17




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
There is a passage in the lower part of the carb that most people over look when rebuilding MS carbs. Most likely that is your problem. Lots of times those passages have to be cleaned with a very small drill spun by hand. Hope this helps.



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RJKeith

07-10-2019 10:52:33




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 Re: Case 311 RN Carbarator Woes. in reply to longcases, 07-10-2019 08:56:17  
Thanks Longcases! By chance you would not have a picture of the jet you are talking about or know of a manual that shows it? The guy that rebuilt it said he cleaned it with glass beads and solution in an ultra sonic tank.



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old

07-10-2019 08:00:51




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 Re: Case 311 RN Carbarator Woes. in reply to RJKeith, 07-10-2019 07:27:48  
Pull the air cleaner tube off and hold your hand over the intake of the carb and try to start it. Do you feel a good suction and also get gas on your hand?? It may even try to start by doing that. If you do not get both you have either a suction problem or carb problem



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RJKeith

07-10-2019 08:52:53




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 Re: Case 311 RN Carbarator Woes. in reply to old, 07-10-2019 08:00:51  
Thanks Old! I will give that a try this week end and report back. I might also pull it down and make sure the new float I put in it is good.



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