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Discussion Forum

Allis `B` Miss

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Big Belgian

05-16-2002 13:11:30

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Tractor runs smooth when parked both idling and at high rpm. Under load it misses bad. Checked Mag, points, new condenser, plugs set @ .35...Checked float level. checked timing, gas flow ok, no dirt in fuel. Put on new plug wires, but used `today`s` automotive type wire....can`t find copper woven wires. Any help will be greatly appreciated. Thanks.

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Kiwi Pete

05-20-2002 23:24:36

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 Re: Allis `B` Miss in reply to Big Belgian, 05-16-2002 13:11:30  
It sounds to me like the carby settings but I could be wrong- my 48 B had similar problems (if there is any black smoke when you throttle up then it could be too rich and will miss under load) I could not get it to run up a hill (under load) without missin and fartin...just keep tweaking the mixture and idle settings on the carb (the reccommended settings are in the manual if you have access to one.Make sure there is no air getting in around the exhaust manifold (sometimes they are not dead straight and need to be tightened - and if still loose add another gasket) and also between the carb and the air cleaner (the rubber hose needs to be clamped on tightly to reduce air being sucked into engine
good luck

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Farmer Brown

05-20-2002 08:48:30

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 Re: Allis `B` Miss in reply to Big Belgian, 05-16-2002 13:11:30  
Lots of good advice from others. There is one more thing it could be. We had a C that acted like this and the thing that finally fixed it was a new coil. Under load a weak ignition will fail to fire. Assuming the new things you list were put on after you had the problem, I would really suspect the coil. I've had the Champion spark plug problem, except when 2 of mine quit they missed all the time. They were only a few months old and only had few hours on them.

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Steve in N.J.

05-16-2002 17:14:50

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 Re: Allis `B` Miss in reply to Big Belgian, 05-16-2002 13:11:30  

Check the spark plugs first like Bryan suggested. If you have Champion plugs, for some reason, "they just don't make em' the way they used to". Quite a few folks have been having troubles with the Champions and "under load" missing is one common problem. Also, If you're using radio resistance wires, you do need to install a set of solid core wires. This delivers maximum power (spark) to the plugs which is needed especially for the tractor in the "load" or working mode. If you can't find the correct wires I make them for Allis engines. Steve

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Bryan Smith

05-16-2002 13:23:55

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 Re: Allis `B` Miss in reply to Big Belgian, 05-16-2002 13:11:30  
NAPA auto parts will have copper-core spark plug wires for you (I bought a set there recently).

As far as the miss - could be something to do with the governor kicking in and adding fuel to the mix - perhaps a main jet obstruction (or not since you've cleaned it out) or maybe the governor's kicking in too far or not far enough. Just sounds like you have problems when the governor opens the carb up.

Could be a bad spark plug out of the box (I've had that happen) - try a set of Autolite 295's if you don't already have them. You might also try setting the plug gap to 0.030" (the manual calls for between 0.030 to 0.040).

Is the miss regular? Does it seem to be on one cylinder only? Might be something to do with valve seating if it's not ignition related.

I'm sure there's something (or many things) I've left out.

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Fred(for Dave)

05-16-2002 13:22:17

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 Re: Allis `B` Miss in reply to Big Belgian, 05-16-2002 13:11:30  
this sounds like ignition,you need to find some solid wires and a good coil wire. I can set you up, but somewhere like valu-blit has in-expensive solid wires that will okr good. Look at the dist. cap also. Let us know how it goes. Fred

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