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If my timing belt breaks will it destroy my engine? on 2002 Toyota 4Runner

If my timing belt breaks will it destroy my engine?

Generally, no, but...
It depends on conditions when the belt breaks. What I mean by this is, if the engine was being over-revved at the time the belt broke (say you accidentally downshifted from fifth to second instead of fourth while trying to pass on the freeway) then there is a good chance that you could do valve damage. Otherwise, you are safe.