B&S engine wont hand turn more than halfway

M

MB2014

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I've got an old Toro Timecutter 42-Z with a B&S 16HP OHV engine. I was cutting with it and it pretty much sputtered out and died. I tried to start it back and the engine will only go about halfway and seems to hit something preventing it from going further. I can hand turn the flywheel easily either direction about 180 degrees and it stops. I'm pretty sure it's not a valve adjustment. I'm not an engine guy. Does anyone have any thoughts on what to look for before I tear into it? Thanks
 
Well that don't sound good at all. It acting something on top of the piston like a broken valve seat. There is only two ways of verifying this. One is to use a bore scope and other is to pull the cylinder head. Now something could have failed in the crankcase too.
 
So this is spark plug. Never seen this before. I imagine this is very bad news?
 

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You need to pull the cylinder and just how damage has been done. I have seen plugs very close to being that damage.
 
Broken valve. The top of piston is beat up pretty bad. It will rotate all the way now with obstruction removed. Is it repairable?
 

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bummer, cheaper just to get a replacement engine. If you are near any mower salvage yards you might find a good used engine at a reasonable enough cost to chance it. But if the mower is good otherwise, a new engine is often the least costly way to go.
 
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