Got started again on assembly of the original engine from my '72 NH S-14, have been running a 12hp Magnum on it since I got it, this K321 was given to me by the PO partially apart because of it's appetite for oil. Have had it back from the machine shop for several months now and I kinda forgot about it.
This engine had been previously blown up and reassembled with all new, standard parts. The little chip out of the bottom of the bore confirms this. Whoever put this one back together the 1st time obviously didn't Mike anything or take any of it to the machine shop because the crank was 0.013" under spec, too small for even a 10-under rod, had to have it turned to 20-under. The PO never complained about a knock, though it had to have. It can't have been run much after reassembly on that overhaul. I don't remember the crank being scored when I got it.
I had a good rod here left over from another old rebuild, I sent it to the machine shop and they bored it for an insert, I can use it with standard or any undersize that I want to now. The machine shop got me a correct sized 20 under insert.
I have a set of brand new crank bearings here that I was gonna put in my next Kohler rebuild, a 16hp pulled off of a machine that had been thru a fire. But this 14 has been apart so long (since before I got it) that the originals in that one turn roughly and I see rust within them. I hope to have this one back together this weekend. Hopefully the PO gave me all of the parts I need to finish it.