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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