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Tractor Talk Discussion Forum

carb problems on Farmall 300

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al bane

11-27-2005 13:27:37




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I"ve owned a Farmall 300 for about 3 years and it always has a slight miss. I bought a kit and put in the original carb and it still had the miss.I bought another carb for it and it also has a miss.I have had 5 different people to work on and clean these carbs and they finally all gave up. You can take the air adjustment screw out and it has no affect of the running of the tractor at all--any suggestions!!!!! !!

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RAB

11-28-2005 12:41:41




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 Re: carb problems on Farmall 300 in reply to al bane, 11-27-2005 13:27:37  
Not sure what you call a slight miss.
Start with a compression test, or looking at the plugs to see which cylinder is burning different. Have you serviced it? Valve clearances? Plug wires? Plugs? Anyways, try to find out why it is missing. Sounds like you can buy carb after carb until the cows come home and it will still miss! A bit of a money waster there!
What did these 5 people do? Did you specifically ask them to clean the carbs? Better to get someone to work on the rest of the motor to find the fault.
Mag or dist.? Could be a worn lobe, not opening points properly, crack in distributor cover, etc, etc.
Could be a worn lobe on the engine camshaft, not opening a valve completely.
Does it use oil? A broken ring? Worn valve guide so a valve won"t seat properly?
Just a few more ideas.
RAB

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RustyFarmall

11-27-2005 14:16:17




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 Re: carb problems on Farmall 300 in reply to al bane, 11-27-2005 13:27:37  
Obviously the problem is not in the carburetor. Take a good look at the carb to manifold gasket, and also the manifold to engine gaskets. You might even possibly have a cracked manifold. Bad gaskets or a cracked manifold will allow air to be drawn in where it shouldn't. The only source of air the engine should have is through the carburetor.



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