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Harry Ferguson Tractors Discussion Forum
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swapping carbs? on tea 20s

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donald g

10-14-2006 13:36:26




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i have a tea-to that originaly had a 24t2 zenith carbarator and was wondering if a 28g zenith carbaratour would work on it? mine is th 85 mm model and i was told this othr carb is off a 87 mm model, i was told it is all the same hookups, any advice would be aprieciated thanks




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John (UK)

10-15-2006 11:38:28




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 Re: swapping carbs? on tea 20s in reply to donald g, 10-14-2006 13:36:26  
The last of the TE20's were fitted with the 28G carb and while it looks the same it is jetted completely differently for the 85mm and will not work satisfactorily. The 87mm engine was fitted to the FE35 and later the MF35. It was introduced from engine SC93795E.



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JerryMT

10-14-2006 15:18:11




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 Re: swapping carbs? on tea 20s in reply to donald g, 10-14-2006 13:36:26  
Why do you want to swap carbs? Is there esomething wrong with the one you have that can't be fixed? I'm assuming the 87mm and 85mm you are refering to are the piston diameters.If thats the case my guess is thet the 28 carb has a larger venturi due to the 4.8 % increase in airflow that the 87 mm engine has over the 85 mm. Without knowing the specifics of the carb, my guess wuld be that the 28 will run leaner on the 85 mm engine, because for a given airflow, the delta p across the metering jet will be less than the carb was designed for. Theoretically you would need a larger power(or main)jet but in all likelyhood, you might be able to adjust the power jet for the airflow difference.
Here what I would do. Install the new carb and then start up the engine and let it warm up. The adjust the carb per the owners manual. Accelerate the egine from low idle to high idle. If it doen't accelerate smoothly, try enriching the mixture by an 1/8th turn on the main jet adjustment and repeat til you geta smooth acceleration.

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Al in BC

10-14-2006 15:04:44




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 Re: swapping carbs? on tea 20s in reply to donald g, 10-14-2006 13:36:26  
Donald.
Mine came with the 28G carb. I have a 20-85 , 1955 Model TEA 445577

I believe John in the UK would concur.
Al in BC



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