It's funny how some of these sounds travel in old iron. I've just gone through my new (to me) Farmall 300, hunting what sounded for all the world like diesel knock in an old mechanical diesel.
I couldn't make it go away by pulling a plug wire and sometimes it would sound like the fan hitting something. It turns out the camshaft was so loose inside the cam gear that the valves would be opened and then the valve springs would force the cam ahead and the valves would snap shut. It was the valves snapping shut that was causing the noise.
You could be right about a broken sleeve stopping knocking for a bit. My MF-35 had two loose sleeves and they knocked worse before it built oil pressure when it first started (figure that one out if you can).
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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