oliver2-44 8,835 #26 Posted January 13, 2019 The H10C spark plug is correct for this engine, so your good there. Share this post Link to post Share on other sites
richmondred01 2,202 #27 Posted January 13, 2019 Striped plug treads are very common on these engines. A properly intstalled helicoil should give you no more problems. Share this post Link to post Share on other sites
bc.gold 3,399 #28 Posted January 13, 2019 13 hours ago, Whnewone said: To my knowledge yes had that installed by a mechanic who does nothing but work on garden tractor engines. Improper thread repair. 1 Share this post Link to post Share on other sites
R. L. Addison 299 #29 Posted January 13, 2019 IO would say both heads have been over-torqued and threads were damaged @ that point. I was guilty of that for many years (cast iron heads, so no damage) and do not remember what made me realize it. I think if it was me, I would put a 3/8 pipe plug in the hole & drill & tap for the H10 plug & try one of the heads I have, think that will take care of the problem. Welcome to RS Share this post Link to post Share on other sites
Blackhood Bill 720 #30 Posted January 14, 2019 Ok, after doing some reading on ACR, I also read, on my tractor forum, what about valve lash being to tight? Would this disable the ACR? Since I don't know anything about repairs that was or could have been made to this Kohler K321, I guess I should read the service manual and just kinda check everything. I have also cleaned off the top of the surface area where gasket sits and the top of the valves and no it does NOT look to have been sleeved. 1 Share this post Link to post Share on other sites
oldredrider 2,547 #31 Posted January 14, 2019 A sleeve would be obvious. You could visually see it...about 1/16" in cylinder. Share this post Link to post Share on other sites
953 nut 51,520 #32 Posted January 14, 2019 On 1/12/2019 at 9:28 PM, Whnewone said: Turned over fairly easy and fires right up If it ran good I would say there is a lot of overthinking goin on! The spark plug came out because someone had ruined the threads and a good head will solve the problem. Don't screw around with anything until the replacement head has been installed and the engine has been run. Once it has been brought up to operating temperature be sure to hot torque the head bolts. If it runs well then enjoy the ride, if not then let us know. 1 1 Share this post Link to post Share on other sites
Blackhood Bill 720 #33 Posted January 15, 2019 (edited) 953 nut should I torgue to proper specifications and retorgue after hot or just tighten then torgue after hot? New head should be Friday along with new gasket. Edited January 15, 2019 by Whnewone Share this post Link to post Share on other sites
953 nut 51,520 #34 Posted January 15, 2019 12 minutes ago, Whnewone said: 953 nut should I torgue to proper specifications and retorgue after hot or just tighten then torgue after hot? New head should be Friday along with new gasket. Torque the head bolts to the proper amount and sequence then use the same sequence as the initial torquing and the same amount of torque to complete the process. You will find that they will turn another half turn or more. Share this post Link to post Share on other sites
Blackhood Bill 720 #35 Posted January 15, 2019 Thank you Share this post Link to post Share on other sites
Blackhood Bill 720 #36 Posted January 17, 2019 Thanks to all my friends here THANK YOU IM BACK UP AND RUNNING AND READY FOR THE SNOW. The C-145 even sounds better now! I'm am so thankful I found this forum. Hope to meet you all in the future! 1 1 1 Share this post Link to post Share on other sites
Howie 882 #37 Posted January 18, 2019 I know this is a little late to the party, on the head retorque the engine needs to go through a complete heat the cool down and then retorque. Here's the paragraph from the Kohler manual;" After reaching the final torque value, run engine for 15 minutes, stop, and allow to cool. Then, sequentially retorque the head bolts to the specified torque value." Glad you got it running! 1 1 Share this post Link to post Share on other sites
Blackhood Bill 720 #38 Posted January 20, 2019 After blowing spark plug out of head, replacing head, replacing spark plugs and, I finally got some seat time and the satisfaction of knowing the is back up and running strong as ever. 1 2 Share this post Link to post Share on other sites