Repairs Toro Z480 Oil Leak Troubleshooting help please

GoJackets79

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New to the forum and glad to have found it.

I have inherited a Toro Z480 with the B&S engine and used it once/week for the last year without problem (except for occasional dead battery).

After the mower sat for 3 weeks, I attempted to start it and it was slower than usual to start and when I got it going, black smoke comes out of the exhaust and oil is flowing from somewhere on the deck (not from the oil filler tube and not from the exhaust) - this is without putting the motor in drive.

I have inspected the mower (a nice day here) and the oil level is where it should be, the engine turns freely with a wrench on the flywheel bolt and both valves are doing their thing. The oil filter is intact and not oily on the outside (no gaping hole I can find)

I would appreciate any advice of other places to look on this mower (e.g. "there is a hose that carries oil to the transaxle that can burst"). Since the engine turns, this could be a DIY job for me.

Thanks in advance for any guidance.
 
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