Overheated, cranking but not starting

Whilst driving the car overheated (no warning light), the tappets made a terrible noise, drove with the noise for about 5km's, then there was a loss of power to the point of the engine shutting down. Smoke came from the engine, waited a few minutes, filled up with water, didn't want to start. I then took off the battery terminal for a few minutes, reconnected it and it still didn't start. Checked for leaks, nothing, replaced the radiator cap a few days prior and the old one was worn and caused overheating. Two days later and the engine cranks but doesn't want to start.