Speaking of timing (cam) belts and chains, does anyone know which,
if any, of the Focus engines are interference and which are
In an interference engine, the pistons and valves share some of the same
space, hopefully kept apart by the timing belt. In a non-interference engine,
the pistons and valves do not share space, so a timing belt or chain failure
can't result in a destroyed engine. Thus timely belt replacement is more
crucial with an interference engine.