K301 problems

[maxtorman1234 0]

I got a 12HP K301 in a 312, and it smoked and knocked, so i measured it up, installed new rod piston and rings and put it back together. It was all within specs. at first It had a bad oil leak, but ran great. It started easy, made no noises at all. Next, i replaced the gasket, and it made a rattle noise. I figured it was the balance gears, since the rod to crank clearance was good, and nothing else was loose. Anyways, i removed the and it still rattles. It goes away when i let it sit and run, when i go up and down hills. It sounds more like a rattle than a knock, but i don't know and im getting tired of working on it. Any ideas? Im about ready to scrap this one. I haven't had a problem like this one before,

[D-17_Dave 12]

Did you check the rist pin? Also the end play and main bearings? You may also get some noise transmitted up through the driveline. Something like a loose or bent driveshaft.

[maxtorman1234 0]

the wrist pin is also good, the driveshaft is straight, and it seems to be coming from the top end, but I have no idea what it could be. End play is also good. I know exhaust valve dosent seat, but i dont think thats it,