I have a 7 hp Kohler engine used on a 2-speed Troy Bilt "Horse" tiller purchased sometime in the 1970's. Think it has a broken connecting rod. The engine turns over freely with no compression resistance and the piston doesn't look to be moving. The engine was old and using a bit of oil but ran great otherwise. Think the oil got low and was plowing on a slope when this happened. Is there any chance this can be repaired or should I be looking at an engine replacement? Also, how do I get the engine off the tiller? It's not exactly obvious.