My service technician says I may need to replace the timing chain to prevent further engine damage. However, I was under the impression that only timing belts require replacement. Could you please ...

Generally it is also a cheaper process, although this does depend on the particular car. Conversely, timing chains generally do not have a scheduled replacement point, but a car of advanced mileage ...

Interference engines have moving parts that interchangably use the same space. Here's what happens when the timing belt breaks causing those pieces to interact.