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Harry Ferguson Tractors Discussion Forum
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T0-20 saga continues

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Mark3

03-13-2006 18:25:24




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Tractor has been sputtering and quits running but will always fire back up. Figured out it is a fuel issue because can keep her running on almost full choke. Turn out what I believe to be mixture screw and it has not affect. This is the larger diameter knob screw on top of carb. Seems to be plenty of fuel if I pull drain on bottom of carb. Rebuilt the carb but had no affect. Noticed one of the long screws in the kit did not fit my carb. Really confused.

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gshadel

03-14-2006 06:20:13




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 Re: T0-20 saga continues in reply to Mark3, 03-13-2006 18:25:24  
Mark, the power screw (big mix srew) leans the mixture as it is turned IN. The idle mix screw (smaller screw) richens the mix as it is turned IN. They are opposite. The power screw should be set ~1 3/8 turns open initially, then adjusted as needed when the engine is warmed-up. The idle mix screw should be initially set ~ 7/8 open. The idle set screw only works up to ~500-600 rpm, then the powerscrew takes over the mixture operation in the carb.
Don't know if any of that helps.
By all means check for leaks on the intake, around the carb, and manifold. Easy to do by squirting WD-40 around them to see if the engine straightenes out temporarily.

Another thing to consider, a richer mixture ignites easier than a lean mixture... You doubt, why do you think you use a choke to start the engine?... the richer mix ignites easier. A rough running engine that seems to run smoother when the choke is pulled could be result of weak spark. Pull a plug and check your spark, should have a bold, blue, zappy spark. A weak yellow spark is no good!

George

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Mike Mohrhauser

03-13-2006 18:40:41




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 Re: T0-20 saga continues in reply to Mark3, 03-13-2006 18:25:24  
Mark,
You may have a leaky gasket. Either the carburetor gasket or the manifold gasket.

Mike M.



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