Yesterday, after sharpening the blades on my mower, I mowed approximately half of my lawn (about 3/4 of an acre) and decided to stop to go inside to get a drink. When I returned a few minutes later to continue mowing, the mower wouldn't start. It had been running fine previously. It would crank fine but wouldn't fire up. It would, however, occasionally backfire through the muffler and carb.
So I took the valve cover off to have a look. As I was removing it, after removing the bolts, I heard something bounce against the frame underneath. Observing the valves I noticed the top (exhaust?) valve was missing the round metal piece that fits between the rocker arm and valve itself. I'm not sure what this piece is called, but I eventually found it laying on the frame of the mower.
It appeared to me that the valve had gotten stuck and allowed the piece to fall out. When I put it back on there was about 3/16" clearance between it and the rocker arm. Does this mean the valve is still stuck open? What would the likely cause be? It is obviously sitting lower than the bottom (intake?) valve.
So I put it all back together and tried to start it again. Same thing. It also seems to have low compression because it spins much easier now.
I am not a mechanic but I am pretty good with my hands and fairly intelligent, so any direction related to fixing the mower would be greatly appreciated.
Thanks in advance.
Markings on the engine:
Model-Type-Code
31Q777-0466 E1-050118ZD
tomplum
mownie
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wesekOriginal Author
wesekOriginal Author
tomplum
wesekOriginal Author
mownie
tomplum
wesekOriginal Author
wesekOriginal Author
mownie
tomplum