Road-Track 39 #1 Posted November 10, 2012 After tearing down a 14hp K321 after a dipper break and a loose nut on the rod. I took measurements of the bore crank and piston. The bore was STD and Crank journal. The bore was clean with no signs of a problem. All measurements in the bore were in spec for a new bore except one. The the top to bottom runout was .004", but the spec is max .002". Both top and bottom measurements were still in the tolerances of a new bore.... This is a working C145 tractor. For my C165 I would go the whole machine shop route, but do I really need too on this one? I think I can get away with new STD piston and crank kit and hone. Question - Should I go with a .003 over piston instead of a STD? The very top of the bore is 3.5010" and the bottom is 3.5050" with the middle at 3.5030" Thanks in advance! Share this post Link to post Share on other sites
smoreau 658 #2 Posted November 10, 2012 I would say no. stick with the standard piston on this one. Make sure you remove the grenade gears!! Share this post Link to post Share on other sites
Road-Track 39 #3 Posted November 10, 2012 That's the plan those won't go back in. I was also going to replace the governor just in case while I was in there along with the valves. Thanks, I was leaning that way. Lets see if that is a consensus Share this post Link to post Share on other sites
tommy3horse 3 #4 Posted November 11, 2012 Hello; Typically the replacement pistons are .010 over. Sounds like you will luck-out proceeding according to your plan on this one. You may give a 2nd thought to the gears tho, K321 and K341 you will probably notice the vibration IMO. Good luck! Tom Share this post Link to post Share on other sites
Road-Track 39 #5 Posted December 23, 2012 Put the 14hp engine together without the gears and do not notice any odd vibration. The engine is strong now and no oil usage so far. I set the rpm'd to 3600 and it is smoother! Without the gears, it is much easier to put the crank in and time to the cam. A real plus! This forum is the best! Merry Christmas everyone :text-merryxmas: Share this post Link to post Share on other sites
Martin 2,133 #6 Posted December 23, 2012 glad it all worked out good with the engine. i guess the gears are a matter of preference but i always leave them out. ive never noticed any more vibration with them out and the engine is always quieter. so for me there out. you said this is in a c145, if you have the oem iso mount setup, im sure its a nice smooth running tractor......... Share this post Link to post Share on other sites
Road-Track 39 #7 Posted December 23, 2012 It does have the shaker isolation plate as does my C165. Share this post Link to post Share on other sites
Buckshot 1 15 #8 Posted December 24, 2012 :) Glad to hear you got her back together and is running strong. On the K-series if it has balance gears, they are the firist thing to go in the scrap can. I do notice a little more vibration at idle but none at mid range or top end. :flags-usa: Share this post Link to post Share on other sites
