rydogg 186 #1 Posted April 2, 2010 Just picked up this C81 the po said that the motor will run for a while then start to slow down and get stuck and then if you let it cool down and take off the screen from the flywheel and put a breaker bar on the nut it will turn over and you can use it again until it gets stuck. What could be wrong with this motor? Share this post Link to post Share on other sites
jpmcleod 4 #2 Posted April 2, 2010 Boy that is weired. It almost sounds like the piston is swelling up from heat (which I doubt) or the cylinder is egg shaped and when it gets hot. it jams the piston. Another could be the crank bearing not getting oil. I can't wait to see the responses to your question. I know they are air cooled and sounds like to me it is getting hot. Share this post Link to post Share on other sites
The Toolman 22 #3 Posted April 2, 2010 Really low on oil or none at all.... :omg: Share this post Link to post Share on other sites
rickv1957 72 #4 Posted April 2, 2010 Possibly the rod seizing on crank,Rick Share this post Link to post Share on other sites
Duff 206 #5 Posted April 3, 2010 Ok, fellas, I probably know the least about engines of anyone on this forum but regardless of what the symptoms are, I'd be tearing that motor down before I started it again. My thinking is that whatever is going wrong inside has to be creating ungodly stress on things, and using a breaker bar to free it up is only adding to that stress. Sooner or later something is going to come apart - or more likely several things. What may only be a few hours of time and a few dollars in parts now could avoid a completely blown up engine in the possibly very near future. Just a humble observation from a backyard mechanic....... Duff By the way...did the PO happen to say anthing about the motor having been rebuilt? The tins look a little too shiny compared to the rest of the machine (which itself looks like a pretty decent tractor!) Share this post Link to post Share on other sites
TT-(Moderator) 1,131 #6 Posted April 3, 2010 I vote for connecting rod/crankshaft journal seizure, but........ There's also a very slight possibility that the camshaft is seized to the pin on which it rotates. I really doubt you could repetitively free the engine after it quits turning if that is the case. @ Duff: Kohler had much better painting techniques then WH, so it's not unusual to see shiny engine tins on a rusty old tractor. This 855 I had is a good example: Share this post Link to post Share on other sites
