3 minutes into mowing today, the motor started banging very loud. I shut it down instantly. I just changed the blades so I thought I might have screwed something up there!! I check and they're fine. I take out my hearing protection and start it back up. Immediately starts knocking. I shut it right off, push it to the trailer and load it. Anyway's I tore into it a bit ago and here's what I found! I didn't go any farther, so I don't know what the crank journal looks like. Everything else looks normal with a visual inspection. So, should I retorque it, put a new gasket and seal in and run it? or Retorque it, put a new gasket and seal in it and sell it on craigslist and put the money toward new power? I bought this mower from a guy a year ago (dirt cheap) that said the motor was locked up because he didn't put oil in it. I was able to wiggle the flywheel to free it up and I ran it with no issues till now, so I'm thinking thats when the rod bolts loosened up. I guess I have just been lucky till now!!