Don't most cars with a rubber timing belt have non-interference engines? That is, if the belt breaks the pistons won't hit the valves? My 240D is interference engine, so if the timing chain breaks the pistons and the valves get up close and personal. In the '91 MR2 I used to own, the pistons would NOT touch the valves if the belt broke; just adjust the timing and put in a new belt, and you're good to go.
'83 240D "Steiner"
'00 New Beetle TDI