a cautionary tale of the Farmall 1206
during the refurbishing of Dad's 1966 Farmall 1206, I had flushed out the block several times to get crud out, using a coolant flush and a garden hose each time. A few months after this tractor went back to work, an area of paint blistered on the side of the block about the length of my index finger, then eventually a coolant weep was observed after hours of use. The attempt to weld the crack failed, and eventually the block was replaced as there were several local donors available at the time, with the original engine guts transferred to the replacement block...alotta cussin and discussin went into that venture, as the mechanic who did the block replacement defied instructions and rattle-canned the replacement block to match the rest of the shiny tractor, getting red overspray on black hoses and white sheet metal.
After it was all said and done, Dad commented that the tractor never had a serious problem up until the original injector pump failed and I fixed it up nice, and that it ran strong for decades with rusty sheet metal and half-rotted and chewed up wiring...he went on to add that I had flushed that engine one too many times. He went on to tell the story of a neighbor who bought a Farmall 866 at an auction that ran well but was absolutely filthy...so one winter, that neighbor decided to clean up that red tractor, and come to find out all that dried up gunk and grease was plugging up every leak on that workhorse, and the guy had a time keeping fluids in it during planting season...so the guy never cleaned it again afterwards so the leaks would plug back up with dust and grit. "Now ya tell me" is what I was a-thinkin after that tale had been shared 🙄