Little advice from here
Wish I had something to offer positive, but I don't know what to advise about the cylinder issue.
I can tell you this much, when I got into my K321 the balance gears were all over the place, but still on the shafts. Both wobbled, didn't line up and were loose. So in rebuilding I plan to do as a lot of guys have suggested, leave the balance gears on the table when it come time to reassemble the engine.
I can't see why they didn't destroy teeth or possibly come apart the way the both wobbled.
I'll bet one thing, when your rod broke and it hit the bottom of the cylinder wall there was a lot of racket before the silence.
Dave
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