K321 Rebuild Questions - Only Cub Cadets

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K321 Rebuild Questions

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01-25-2012, 07:01 PM

gost530

Member

Join Date: Jun 2011

Location: Oxford, Ohio

Posts: 34

K321 Rebuild Questions

I am in the process of rebuilding a K321. This engine had a knock. The balance gears did have a substancial amount of wobble. I plan on leaving them out. I had the crankshaft turned .020. Since I noticed a little oil on both sides of the headgasket I had the head milled. I also had the cylinder bored .010. Now for my problem. The new piston feels sloppy in the cylinder without the rings installed. Now I am not an expert with a set of mic's and I do not have a bore gauge but I do have a set of inside mic's. I measure .009 cylinder to piston clearance. The shop that bored it says that measurement is .006 and since the piston is totally aluminum it will expand as it gets hot. Therefore it needs that much clearance. Any comments? Would you guys recommend I go with it?

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