When should timing belt be changed or should it be changed at all?

Car: Acura, Legend, 1989 - Back to Fix-It - Acura Legend Repair Manuals

Q.i have a 1989 acura legend i just bought with 150000miles. none of the records show any replacement of the timing belt. when should it be changed or should it be changed at all?

Answer The recommended replacement interval for the timing belt on the 2.5L and 2.7L V6 engines in the Legend is 90,000 miles.
Both of these engines are what they call "interference" engines, which means if the timing belt breaks there is not enough clearance between the valves and pistons to prevent engine damage.
You have been lucky so far. I would recommend getting that belt replaced ASAP.
for more information about timing belts and belt replacement, you might find this article helpful:
http://www.aa1car.com/library/2003/us70343.htm

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When should timing belt be changed or should it be changed at all?