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Harry Ferguson Tractors Discussion Forum

TEA-20 wants a choke now.

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Klaus

09-04-2007 08:09:54

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Hi again. A am absolutely new in the world of tractor owners. So I keep getting small issues. There for I am glad that a forum like this exists. Apprently my TEA-20. has only been running on 3 cylinders. But it has started every time. It has been running OK but a bit rough. So I just changed plugs and wires. It now runs on all 4. Still a bit rough, but with much more power. Thing is, now it needs to be choked for 2-3 minutes before it can run without choke.
Do I need to look to carb ajustment (Zenith 24 carb). Or does any one else have a pice of advice.
Klaus.

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John (UK)

09-05-2007 11:24:33

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Re: TEA-20 wants a choke now. in reply to Klaus, 09-04-2007 08:09:54

From how you describe if it is a Zenith 24T2 carb. you need to open the main jet on the carb an 1/8th of a turn. The main jet is on the side of the Carb (at the bottom) nearest the generator and is horizontal into the carb. This adjuster may be a rod with a pin through it or a rod with a knurled knob on the end.If the setting is correct then you should be able to open the throttle quickly and the engine should speed up immediately without spluttering. Have you got the correct plugs in there (Champion L10 or equivalent set to .030" and set the points as well to .012" if it is 6v and .015" if it is 12v)both of these things will cause it to misfire and if you have had problems with it running on three cylinders I can bet that that there is something wrong with the plugs. If it has been running on 3 cylinders for as long as you say you should change the engine oil and filter and some of the fuel will have gone down into the oil pan and diluted the oil. If you need more info about all this , just email me....John
fergusontractors(at)tiscali.co.uk

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Klaus

09-04-2007 10:42:56

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Re: TEA-20 wants a choke now. in reply to Klaus, 09-04-2007 08:09:54

Lance, cap and rotor looks fine. did not check the others, as I am installing a Pertronix ignitor next week.

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Bob (Aust)

09-04-2007 13:58:05

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Re: TEA-20 wants a choke now. in reply to Klaus, 09-04-2007 10:42:56

"I am installing a Pertronix ignitor next week.."

Best TEA20 investment you will ever make. I have one on my TEA20-85 and am xtremely happy!!

Cant answer your choke problem although I've had similar problems in the past. The carby may be sucking to much air? Had the Zenith carby on my tractor professionally reconditioned, including bushing and fitting oversize butterfly shaft.

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Lance J.

09-04-2007 09:42:20

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Re: TEA-20 wants a choke now. in reply to Klaus, 09-04-2007 08:09:54

Just out of curiosity, did you check and/or reset the ignition timing when you replaced the plugs and wires? How about the points, condenser, cap, and rotor?

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Jerry/MT

09-04-2007 09:26:18

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Re: TEA-20 wants a choke now. in reply to Klaus, 09-04-2007 08:09:54

You may need to enrich the idle circuit but since I am not familiar with your carb somemone else will have to advise on how to do that.

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Bob (Aust)

09-05-2007 02:32:16

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Re: TEA-20 wants a choke now. in reply to Jerry/MT, 09-04-2007 09:26:18

Klaus. With the Petronix Igniter you can not time the distributor in the normal manner, No 1 TDC etc. Also, as the timing hole to see the fly wheel is only 1/4 inch diameter, you can't use a timing light.

I checked the timing on my TEA20 with the points, then installed the Petronix system and the timing appears to be perfect.

My ears are not well attuned to set the timing "by ear". I thought of transferring the TDC timing mark onto the front pulley and timing chain cover and using a timing light.

I'd be interested if you discover how to accurately check ignition timing with the Petronix system? It is not covered in the Petronix instruction leaflet.

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