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Harry Ferguson Tractors Discussion Forum
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Plug fouling problem on TEA 20.

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Enzo

06-24-2006 20:35:27




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Hi, I'm new to this forum and was wondering if anyone could help me with a problem i'm having. I own a TEA 20 and I noticed recently that my spark plugs quickly get fouled with a crusty black goop. Also my engine oil gets dirty very quickly. I don't know if it could be a carburator problem since it seems to require some maintenance (engine floods with gas if I store it with fuel valve open and carburator drips gas}. My tractor has a Zenith 28G carb and while trying to locate a carb repair kit I discovered it should have a Zenith 24TZ. Could this be the root of my problems or can a TEA 20 run properly with a 28G carb?

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Al-SudburyCan

05-25-2007 09:36:29




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 Re: Plug fouling problem on TEA 20. in reply to Enzo, 06-24-2006 20:35:27  
Hi! I have a 1954 TEA 20. The carb on this tractor is a 24Tz.

I am in the middle rebuilding this carb in order to get this tractor going. Does anyone know how to set it up? I've pulled off and opened it up, is there a needle valve for the float how do i set the float?



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mike2

06-25-2006 06:47:56




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 Re: Plug fouling problem on TEA 20. in reply to Enzo, 06-24-2006 20:35:27  
Well, unfortunatelly this does not sound like a carb problem. When you have a spark plug with oil deposits or is coated with black oil this typicall is representantive of oil getting past work valve guides or piston rings into the combustion chamber. Does the tractor smoke when you hit the throttle? When you hav a carb problem in that it is too rich of a mixture, your plugs will have a black soot on them. Are you sure the black on your plug is not soot? If not sure, rub it on your hand and see if it oil or soot.

I would probably tend to take the head off and work it over first. I am sure that when you remove the valve cover you will find gobs of oil. Oil was very dirty when these tractors were built. I do not know what is involved with rebuilding a head but hopefully somebody else on here would know. I am actually wanting to rebuild my head as well since it is probably due, preventative maintenance.

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John (UK)

06-25-2006 06:38:50




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 Re: Plug fouling problem on TEA 20. in reply to Enzo, 06-24-2006 20:35:27  
It depends on how old it is as to which carburettor is fitted. The original carb. was a 24T-2 but at engine SC93795E (1955) they changed the carb. to a 28G. It does sound as though your carb is set incorrectly, get the engine hot and and then set the carb as follows:- main jet 1-1/4 turns open +or- 1/4 turn, the slow running should be:- 1 - 1-1/2 turns open, set it until it idles smoothly. The engine should accelerate quickly and not splutter if the main jet is correct. Before you do the carb, check the plugs and adjust, they should be Champion L10 set to .030" and the points should be set to .015". Very often people fit the incorrect plugs to these engines and cause all kinds of problems, they just will not run correctly on any old kind of plug no matter what the guy behind the parts counter may try to sell you. The carb flooding is possibly dirt in the valve above the float or it is worn, but really it is always better to turn off the fuel when it is parked for any length of time. The engine oil getting dirty may or may not be related to this problem, if you are using a multi-grade oil, this does contain detergents and it will wash the carbon deposits from the engine so it will discolour the oil fairly quickly. You should also check that the air filter is clean, take the whole thing off the tractor and allow it to soak overnight in some gas or something similar and wash it out the following day, the oil in there should be changed every day when the tractor is working and in dusty conditions it was recommended twice daily. When you adjust the carb. don't over tighten the screws or they may damage the jets, just gently close them to start with and then open them the correct amount. You can use NGK L86C plugs instead of Champion if you prefer.
Your engine may also benefit from the ignition timing being checked and adjusted if required, if you need the info to do this email me at:- fergusontractors(at)tiscali.co.uk and ask me for what you need.....John

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Bill Brox

06-26-2006 03:23:03




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 Re: Plug fouling problem on TEA 20. in reply to John (UK), 06-25-2006 06:38:50  
Sorry John, but the L86C you mention is a Champion number, and not a NGK number.

The L10 is not produced anymore, but the equivalent is according to Champion headquarter in USA L90C, but, I see that many use the Champion L86C instead.

I also hear that more than one person complain about spark plugs for the TEA 20, that they do not burn clean anymore.
Can this be due to the wrong heatrange ?


Bill

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John (UK)

06-26-2006 05:25:25




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 Re: Plug fouling problem on TEA 20. in reply to Bill Brox, 06-26-2006 03:23:03  
Quite right Bill I read the wrong column, it should have read NGK B6HS.I give the original plug number specified by Ferguson and then anyone who has a particular plug make that they like can get a cross reference for it. Regarding not burning clean anymore, could be a number of things, wrong heat-range as you suggest, a hotter one may be better as most tractors we deal with on here are not worked hard as they used to be, so never get really hot and they cannot clean themselves. I have found that most of the tractor carbs are too rich for various reasons, lack of attention to the Air Cleaner being the main one, they very rarely, if ever change the oil or take the cleaner off and wash it, or the people adjusting the carbs just don't have sufficient "feel" for doing it. Often they set the carbs when the engine isn't fully hot due to impatience, they can't wait until it does get hot and they don't set it at max revs and try to set the slow running jet at any speed other than "idling" and then say that it doesn't appear to make any difference how they set it as it has no effect. There is also the problem that there are two different types of main jets fitted to the 24T-2 carb and any instructions they have for setting the carb. may not be correct for the particular type of carb. they have. There does seem to be more interest in getting the engines running correctly though due to the price of fuel now, maybe they will be more conscious of these things in the future.

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Enzo

06-25-2006 08:17:04




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 Re: Plug fouling problem on TEA 20. in reply to John (UK), 06-25-2006 06:38:50  
I checked my tractor it"s ser. # is TEA 441884, I can"t find an engine # except 27 9 4 stamped on block. Where should I look for engine #? I use NGK L86C plugs which get fouled with a crusty black substance after a few hours use. And yes, it does exhaust black smoke when I push the throttle .



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John (UK)

06-25-2006 10:10:35




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 Re: Plug fouling problem on TEA 20. in reply to Enzo, 06-25-2006 08:17:04  
The 27 9 4 is the date the block was cast 27th Sept 1954. Your tractor was assembled around the beginning of March 1955. The engine number is stamped in the block between the coil and the oil filler, it will be prefixed by SC and end with an E...If the carbon on the plugs is dry then it is just running too rich and you need to alter the carb with the specs. I gave you earlier, once those are right you will be able to see and hear if there is anything else wrong. The best thing to do is to get the engine hot to working temperature, no use doing it unless it is as that is how it works, hot not cold, then adjust the carb.main jet first when its on full throttle and then set the slow running jet at idle speed, you can change idle speed with screw at the back of the carb. It should idle at 450rpm. It should be more economical then.
You have my email address if you need more technical written info.....John

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Enzo

06-25-2006 13:53:17




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 Re: Plug fouling problem on TEA 20. in reply to John (UK), 06-25-2006 10:10:35  
Thank you so much for the invaluable info. This tractor has been in my family for very long but had been maintained by well meaning bit misinformed amateur mechanics. It's got it's original grey paint and most of it's original parts including some extras. And by the way, the carbon deposits on the plugs are dry. I will have to start by installing a new carb kit as the main carb gasket leaks. I had been hesitant to do this as I was convinced the wrong carb was on this tractor and didn't want to waste my time revamping the wrong part.

I had been told that worn out oil rings on my pistons might be the culprits and the cause of all my problems. I somehow doubted this as the engine regained it's power the minute I would put in new unfouled plugs. I'll keep you informed of the progress.

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John (UK)

06-25-2006 14:19:16




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 Re: Plug fouling problem on TEA 20. in reply to Enzo, 06-25-2006 13:53:17  
The part number of the repair kit is Sparex S66466 it is the same carburettor that fits the 87mm Standard engine in the 35 or 135. If the deposits are dry it is unlikely to be oil. If the rings were worn it would lose power as you thought and it would smoke badly. You can get the Sparex parts from your local tractor dealer. Or email www.sparexusa.com for your dealer.



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Enzo

06-25-2006 13:50:41




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 Re: Plug fouling problem on TEA 20. in reply to John (UK), 06-25-2006 10:10:35  
Thank you so much for the invaluable info. This tractor has been in my family for a very long but had been maintained by well meaning bit misinformed amateur mechanics. It's got it's original grey paint and most of it's original parts including some extras. And by the way, the carbon deposits on the plugs are dry. I will have to start by installing a new carb kit as the main carb gasket leaks. I had been hesitant to do this as I was convinced the wrong carb was on this tractor and didn't want to waste my time revamping the wrong part.

I had been told that worn out oil rings on my pistons might be the culprits and the cause of all my problems. I somehow doubted this as the engine regained it's power the minute I would put in new unfouled plugs. I'll keep you informed of the progress.

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Jim W

06-28-2006 07:28:53




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 Re: Plug fouling problem on TEA 20. in reply to Enzo, 06-25-2006 13:50:41  
Once you have the correct spark plugs another ignition-related possibility is a weak coil. JIm



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