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I have a John Deere 102 riding mower. I got into some tall wet grass and the lawn mower stopped to due to grass getting caught up under the blades. I pulled out and took a less wide path. The mower started to do the same. I pulled out, stopped the blades, then I heard a loud pop/crack from engine. The engine will not start now. WHen I turn the engine over all I get is a whining sound.

check the key in the flywheel

I let the lawnmower sit for a day. WHen I went back to it I noticed a puddle of oil under it. Not exactly sure where the leak is coming from.

it sounds like you might have thown a conecting rod the wining sound is the flywheel and crank spinning freely ouch: