confused

[93y7]

last week my timing belt tensioner spring broke and the timing belt jumped a tooth or two. bent 2 exhaust valves. i replaced the valves and the spring and it started up no problem and after five minutes of idling the cam broke flush with the back of the cam gear and thats all. not inside the motor. what would cause this? malfunctioning part? stressed part from when it jumped?

 

[BrokenRex]

you'd have to open it back up and see if those replaced valves didn't fall out and wedge between the head and the piston. if internally the engine is sound, then check to see if the cam is seized in the head. whenever an engine is taken apart, you should thoroughly lube all contact surfaces upon re-installation. failure to do so can have nasty results. but to answer your question, no one will know without tearing down your engine. and yes, i know that doesn't answer your question.