lb7349 0 #1 Posted February 5, 2015 I hace a kohler k321 engine I replaced head but no compresson Share this post Link to post Share on other sites
groundhog47 347 #2 Posted February 5, 2015 (edited) You are prob aware of the ACR (auto. compression release), but I'm not sure what rpm it kicks out. Even so with your plug out, a blown head gasket would even give a minimal feel with thumb over spark hole. Have you removed head and watched to see if valves opening and closing and gasket not blown? If so and all is well try putting all back together and see if when starter rotating, dip stick out that internal pressure feels to stong (excess ring blow by...totally worn out). Might also hear see, feel excess crankcase vent - valve breather blow by with shot rings. Hope I'm understanding your condition and this makes sense! Edited February 5, 2015 by groundhog47 Share this post Link to post Share on other sites
KC9KAS 4,741 #3 Posted February 5, 2015 (edited) The ACR shuts off (or closes) at 600 +/- RPM I think, so you have to spin it pretty fast to really check the compression. Edited February 5, 2015 by KC9KAS Share this post Link to post Share on other sites
wheel-mule 45 #4 Posted February 6, 2015 I have spin the engine backwards to check compression. Share this post Link to post Share on other sites
lb7349 0 #5 Posted February 6, 2015 thank you to all that replyed to my post it was very helpful Share this post Link to post Share on other sites
can whlvr 991 #6 Posted February 7, 2015 what do you mean no compression,as in zero,if so I would think you have a valve issue,not closing all the way,i would pull the head and check to see if both are operating as they should,maybe even try a feeler gauge around them when closed to see if its actually closing Share this post Link to post Share on other sites
