When to replace timimg belt

Toyota recommends replacing the timing belt at 90,000 miles. But, with a 14-15 year old vehicle, it may not be a bad ideal to replace sooner than 90,000 miles.

Toyota states timing belt interval: 90,000 OR 10 years - whichever comes first. Best advisement - so as to not have other repairs be required, is to replace the complete timing belt set. Timing belt set is: timing belt, idler roller, tensioner roller, hydraulic tensioner adjuster, water pump and exterior drive belts if required. DO be wary - as some places are known to "double dip" on labor - charging the labor time on the timing belt AND the time of the water pump. Additionally, it the water pump is not replaced, leakage can occur due to wear on the bearings/seals with the additional tension with the new belt.