Posted by used red MN on April 29, 2023 at 23:34:53 from (68.46.31.28):
In Reply to: Oliver 1850 posted by Medic52 on April 29, 2023 at 20:25:52:
Hello medic welcome to YT! What are doing with the tractor while running it when it is ..runs fine..? Those bigger gas tractors use a lot of gas when working hard. If you look at the data from testing on that tractor when it was new you will see it will use over 8 gallon an hour under a heavy load. This means under full load you need a little more than a pint every minute coming in the carb. I am going to copy and paste the rest of this in from another post I made on a Ford today and hopefully I get it all changed to apply to your Oliver. There a should be a drain plug in the bottom of the carb. Get something to catch the gas, a clear container is best so you can see if there is crud in it and/or what the crud looks like that comes out. It will flow faster at first as the gas in the carb bowl drains out in about 5 seconds or so. But then it should continue running at a smaller steady stream. If it slows down to barely much more than a dribble your carb is simply not getting enough gas. You should do a 2nd round test with an actual pint measure to see what the actual flow is. I am going to say for the most part just driving the tractor down the road by itself up and down hills it might require 4 gallons an hour. So get a pint measure and open the carb plug let the first 8 seconds or so drain into something else. After that catch the flow in your measuring pint. To get almost 4 gallon an hour you need to fill that pint in 2 minutes. If your fuel flow is inadequate I believe there is a fine screen in the fitting that screws in the carb for the gas line to connect to, see link. Turn off the gas and pull that out to check it for being plugged. When you have the line off open the gas valve and direct the line in the container and check for a good flow there. If the flow there is questionable you will need to check out the sediment bowl below the tank which should have a round screen in the top of it that sets above the top edge of the glass. Also sometimes crud or debris gets in the opening where the gas flows out of the tank into the top of the sediment bowl. Take a good flashlight and look down in the tank and see what kind of debris you see floating in the bottom that may plug things up. Aside from this a faulty ignition coil can act similarly, usually when they go bad they get very hot. Also a faulty condenser can mimic this issue as well. These days getting a new one that is good is a real crap shoot.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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