The Zetec engine is "supposed" to be a non interference engine, but
in the real world they can and often do bend valves when problems with
the belt happen.
Valve damage is most common when the tensioner seizes and the belt
wears away the plastic idler badly retarding the valve timing. Valve
damage from the belt suddenly breaking from age happens in about half
of the cases I've seen. A compression test will tell for sure.
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