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I loosened each injector line and none of them seemed to change the noise. It sounds very much like a rod knock to me. It is very loud to the point it hurts my ears a little.

I'm sure its in the engine. I'm uploading a video now from tonight. Depressing the Clutch makes no difference. Also removing belt makes no difference. It doesn't seem like something in the muffler. I put my hand on the muffler and it does not feel like its in there.

Yes I did

This is before I put bearings in it. I will get a current video soon. https://youtube.com/shorts/hQoQCQBPs34?si=54Iw2n6mylNrQqPZ

I bought a 3130 recently and shortly after I started using it I started noticing a knock that seemed to get worse as the tractor warmed up. I Figured it was a rod bearing and pulled the oil pan and the rod caps and everything looked ok. I then pulled the engine out and put new pistons, wrist...