Tractor Repair: Massey Ferguson 135 knocking bad and lost power, massey ferguson 135, tall weeds

Question
I was brush hogging in really tall weeds and I think maybe it might have over heated from all the fuzz from the weeds was covering the radiator which isn't that good ho shape to began with but still has been working, It started to make a load noise shut it off and noticed some coolant leaking out not a lot but looked like it was over heated also noticed some oil coming out around the dipstick and what looks like a little pressure valve on the engine block. You can start it back up and sounds like a really load clanking or banging sound up towards the first cylinder towards the water pump it will still move put doesn't have much power anymore. Do you know what I should look at first or what it might be from that description. Thank you for taking the time to answer this Arnie.

Answer
  If it sounds like the noise is up front and coolant is leaking out, possibly the water pump bearings failed and the fan is hitting something so check that first, but that would not explain the oil coming out and the loss of power.  It's more likely to be internal engine damage causing it to push oil out and lose power.  Don't run it anymore or you will cause more damage.  If everything on the outside checks out OK, the engine will have to be disassembled to see what happened.