Posted by aaronknodel on May 20, 2021 at 08:33:24 from (209.222.161.20):
Hello everyone, Over the winter I rebuilt the engine on a Case 930 round fender, new pistons and sleeves, main and rod bearings and had the heads decked and valves done, reassembled and it started and ran amazing, lots of power burnt no oil and I was happy, it did however have a mild knocking sound right from the first startup, really only could hear it at an idle and more or less went away at higher RPM. I posted a recording of it on another engine group and several people said it sounded fine, and was normal for an old diesel, so I went on my merry way. Put about 20 hours on it harrowing and drilling, and it pulled great, then kaboom. Punched rod #1 out the side of the block and broke the camshaft in two places, looks like both lobes for the first cylinder. The rod bearing is all squished up but doesn't appear starved for oil or anything, colour is consistent. We have another block from a part tractor to rebuild it (again) but I've got to know what the problem is before I get too far, any ideas what caused the knock and eventual failure?
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