Posted by Bkpigs on July 18, 2019 at 16:37:51 from (50.103.115.15):
Well, I finally admitted to defeat with my dad's IH 300U. It started off with a simple carb rebuild early this summer. The tractor was over fueling, black smoke and missing.
Got the carb kit from a reputable carb site. Still no improvement. Replaced the float thinking the float wasn't raising high enough. Still nothing. I adjusted the float to lower the level of fuel. Again, no improvement.
Did a compression test and got 150 psi across the cylinders, adjusted the valves, replaced plugs, wires, cap, rotor, and points since they were showing age any how. Still nothing.
Removed the carb and lowered the fuel level setting again and still no improvement.
All passages in the carb are clean and the idle jet is good.
When I shut the fuel off and let the tractor run out of fuel, it will run perfectly for about 15 seconds right before it runs out of fuel.
Finally told Dad to call someone else to fix it, I am done wasting evenings chasing the problem.
I have rebuilt several carbs and have never run into a problem that eventually I couldn't get figured out and the motor up an running.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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