when i shut off the engine i get this tinkering noise like metal on metal, but very light. Almost sounds like something vibrating against something, but i only get it when shutting off the engine... Also my timing chain looks good and I see no rub.

 

Just a guess at this point but check the heat shrouds that are attached to the exhaust pipe in places. Mine made a similer sound and one of the shroud clamps was missing. I just used a large hose clamp to resecure it. Get under there and bang the exhaust with your hand to jiggle it and see it you hear the noise.

 

catylytic converter? Would seem normal if so I would think.

 

ok, now it is overheating, this might be relivent, because i read somebody say something about a tink, tink, tink at shutdown haveing something to do with overheating... Any ideas?