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TEA20 Rough idle

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Serge

06-11-1999 06:56:00




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Thanks to read this

I bough a TEA20-85 1 year ago and tractor needed complete tune-up. I changed dist cap/wires rotor
carb kit. All adjusted as per service manual.
Starts good, engine power ok but... still have rough idle. Compression is 120 P.S.I. each cyl.
Looks like vaccuum loss but checked with WD-40 shooted around each component in intake area no leak.When on load engine runs ok but idle or no-load runs rough. Can somebody help ? Thanks !

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Bruce Cameron

06-23-1999 00:51:06




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 Re: TEA20 Rough idle in reply to Serge, 06-11-1999 06:56:00  
If you have a TEA as opposed to a TE, the TEA had a Standard built engine with a Zenith Carb (the Continental Z120 had the Marvel Shebler as fitted to the TE models). From my experience, when running on parafin (tvo), the idle can be fairly lumpy as standard!

TO = Tractor Oversea
TE = Tractor England



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kevin

06-11-1999 10:59:07




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 Re: TEA20 Rough idle in reply to Serge, 06-11-1999 06:56:00  
When you rebuilt the carburetor did you check the idle passage to see if it was open? These are very prone to stopping up as they are very small diameter. This passage is not on the top half of the carburetor where the idle screw is but is in the bottom half. If you look in an I&T manual for the Ford N tractors they have a better picture of a Marvin-Schebler carburetor than the Ferguson manual. The manual shows the location of the idle passage. You may have to soak the carb in cleaner or as a last resort use a fine wire to open the passage. It may sound like a lot of trouble, but speaking from experience your tractor will never idle if the passage is stopped up.

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