Crazy stuff
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2001 Audi timing belt
2001 Audi Engine-1.8L
This is the result of a timing belt that shed it's teeth because it was not replaced at the suggested interval. Rubber in the timing belt ages as the engine heat cycles, and becomes brittle. Eventually, a high stress event like attempting to start the engine after it has sat overnight will shear the teeth right off the belt. This is an interference engine; the cylinder head was damaged when an attempt to push start the vehicle was made, and the valves contacted the pistons. All of the valves on this head should be fully closed in this picture, but some are stuck open because the valve stems are bent. A very expensive repair ($2500) could have been avoided if the belt would have been replaced on schedule.
Missing teeth