The 20hp/656cc Briggs and Stratton V-Twin engine on my Dr Brush mower shit the bed today. Made a bunch of cool sounds, quit running, and shot flames out the muffler all at once!!!
Pulled the plugs, no compression on one side. Pulled the rocker cover off the no compression side, valves not moving while turning engine over. Pull the head, the piston does not move either!!
Valves:
Piston:
On the bottom end, guessing the connecting rod broke. The engine still spins over freely and the other cylinder still moves and has compression. As for the valves not working, no idea, unless the camshaft broke. On the no compression side I pushed the piston back down the cylinder with my finger, so it is definitely not doing much of anything!!
Engine is 9 years old, probably 7-800 hours on it. I do not think it would be economically/time feasible to attempt to rebuild this engine. Will probably just buy a new engine, maybe a stronger series. This engine was an Intek series, so kind of middle of the road. Might need to get a more industrial use engine. I am not like the typical user, when I use this machine I will run it 8 to 10 hours straight.
Oh well, the yard gets a break for a little while!!