I'm the guy other folks bring their head scratchers to, and it usually doesn't take too long to find something logical that got overlooked. A "fresh set of eyes" can often do that. But a couple years ago this had me stumped for a few days:
Yes, I got that one figured out, and it wasn't 'illogical' . Turns out one of the choke plate screws had fatigued and broke and the other fell out, or maybe it was vise-versa. Found the intact screw still in the carb, but not the head of the other (hmmm...). With the plate floating around just north of the venturi, it would sometimes choke it to death, and other times allow it to run just a little rich. Ended up ordering a replacement carb from YT, and that solved a couple "Mechanopause" related issues. :D
At the moment, I'm puzzling a neighbors '58 JD 420 with manual steering. Every moving part from the steering wheel (broken and welded spokes) to the steering gear box is beat to death. From what I'm told from the JD forum here, it shouldn't be hard to steer, but it is, and obviously has been for decades - keys and keyways are whooped; stub shaft AND bushing bores are long beyond simply replacing cone bushings; u-joint below the steering wheel was badly worn, missing the through and one stub pin, and is now broken... Spindles are not tight (I can move them by hand with the tie rods dropped), but I've driven loaded dump trucks with dead power steering that turned easier than this does going through the field. Not that I won't figure it out, it's just that he's hesitant to let me take it completely apart quite yet because it's already stretching his budget.
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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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