Sam: I suppose you have a point, however I think a broken sleeve could stop knocking for a short period.
Having said that, after 26,000 hours with D-282 engines, broken sleeves are not the only knocks I've heard. You realize of course D-188 is just 4 cylinders of the D-282 engine.
I had 656 bend a valve push rod once. Young lad that was running 656 on haybine at time noticed it, but didn't seem that bad from seat. I had just finished milking cows, came out of barn to hear 656 knocking badly as he drove towards me. As he turned at the headland and started to go the other way tractor sounded quite normal. I proceeded to field with haste. Out front and hearing it through the grill, you'd swear it would fly apart any min. Behind or in the seat you'd hardly notice it.
Another knock I heard was 560 working on forage harvester, roughly 9,600 hours on engine. It would develop a sharp little knock several times per day, and each time it would fade away to nothing. We finished filling silo, however once at night we noticed our little knock was acompanyed by a shower of sparks out the exhaust.
We pulled the pan and head after silo filling. Two pistons had ring pieces missing, with pick marks in top of piston and in head. Technician I had decided rings had been breaking up, coming to top and hammering them until the parts were small enough to blow through the valves and out the stack, thus source of sparks.
We installed a piston and sleeve kit, and those were the sleeves that broke after 1,500 hours. Technician was not thorough enough on sleeve sizes. I was told afterwards there is a difference in sleeves, and they must be ordered to fit the particular block.
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