engine locked locked up took head off metal pieces ontop of piston piston looks good any idea's on what to do truck is only 3 months old

Sounds like maybe a collapsed bearing or the conrod has snapped or bent,i'm afraid it'll need stripping and further investigation.Very rare to hear these engines breaking down after such short a time.Are you sure that you ran it in to the letter and tuned it right,aswell as maintainence like after run oil?

I have seen this before!! When you open the rear of the engine and you will prolly find everything might look ok, other than some bits of metal. If that is the case, then you prolly have experienced the retaining wire that holds the wrist pin in the piston has come loose and wedged between the sleeve and piston. Look for a deep verticle groove in the sleeve wall. If this is true you will have to carefully work the piston to bottom dead center so you can work the sleeve out of the block to replace it and the piston. Granted its a fluke, but I have seen those symptoms before!!

Be very careful, working the piston down, you can bend parts.

Let us know what you find!!!! I might have something to help you remove the piston and sleeve..

Good Luck!!

took it apart nothing looked broke cleaned out metal seems to be working fine

Shouldn't you heat up the sleeve and piston to help get it lose from the rod? thougth I read that somewhere before and not sure if it will help save what you can.