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John Deere B rough idle

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John

12-29-2002 20:05:17




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I have an early styled B with electric start. The tractor starts well but misses and sputters when idling. When the tractor is hooked up to a disk and put under load it sounds great. plugs doesnt seem to matter, i use auto-lite plugs.any simple suggestions that might make it idle a little smoother?




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Earl

12-30-2002 18:59:40




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 Re: John Deere B rough idle in reply to John, 12-29-2002 20:05:17  
John/ Have seen similar problems with a B that wont idle smooth. Some of the things I have found are vacuum leaks at the manifold, or worn throttle shaft bushings at the carburetor. Check the throttle shaft for excess looseness. Use an unlit propane torch around the manifold and carb throttle areas and if it smoothes out you have found a vacuum leak. Worn valve guide can also contribute to idle problems. If closing the choke makes it idle better you are richening up the mixture to compensate for a lean problem caused by a vacuum leak. Adjusting the idle needle on the carb sometimes helps. Other carburetor problems that cause poor idling may be plugged idle passages in the carburetor or improper float level.

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John T

12-30-2002 06:20:18




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 Re: John Deere B rough idle in reply to John, 12-29-2002 20:05:17  
John, I once had similar problems on my B and hate it when a tractor wont idle down smooth. Some causes of poor idle are vacuum leaks (leans mixture out too much) like at the manifold, or worn throttle shaft bushings in the carb. When you move the throttle shaft, is there excess slop?? Try spraying WD40 around the manifold and carb and if she smooths out, you have found the source of the vacuum leak. Worn valve guide also contribute to idle problems, at idle when the throttle plate is near closed, is a high vacuum situation. If slight choke makes her idle better, that is richening up the mixture to compensate for the extra air sucked in by the vacuum leak. Try adjusting the idle needle on top of carb and see if that helps. Other deeper in the carb problems (if its not a vacuum leak situation) causing poor idle may be restricted idle passages in the carb. This web site at Robert Beavers Carb Repair web site shows some of the locations which may be restricted causing poor idle. www.robertscarbrepair.com/tip1.htm. I use the long aircraft drill bits No 40 and 53 to drill them all out after removing any necessary brass drill plugs, because boiling or carb cleaner or wires etc etc or soaking till the cows come home wont remove the rust etc that clogs those small idle passages. Good Luck and let us know how you come out. Ol John T Nordhoff in Indiana.

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Clooney

12-30-2002 05:04:48




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 Re: John Deere B rough idle in reply to John, 12-29-2002 20:05:17  
John, seeing as it runs good under load your ignition is probably good.
~You could have worn intake valve guides.... or carburetor problems, like a restricted idle circuit or transfer hole, worn throttle plate, worn throttle shaft bushings, or small intake manifold gasket leak. ~Try closing the choke to different positions at idle to see if that makes it idle better, if so suspect one of the problems above. ~Does the carb idle mixture needle have much [or any] effect on the idle quality? If not suspect the carb idle circuit. Try backing the idle needle out about 2 turns from seated & see how it runs there.
~It probably wouldn't hurt to do a compression test to see what the compression is in each cylinder.

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