Toyota Repair: I have a 96 T-100 4 cylinder..., mechanical damage, timing belt

Question
I have a 96 T-100 4 cylinder with 105,000 will I harm this engine if I don't replace the timing belt?
Also I own A 98 Sienna with 90,000 will I harm this engine if I don't replace the timing belt?

Answer
The 4 cylinder engine does not have a timing belt, are you sure the T-100 has a 4 cylinder engine? As far as I know they all used a V-6 engine, in any case, all toyota timing belt driven engines(except V-8s) are non intrference which means that if the belt breaks the engine just stops running and there is no mechanical damage.