The Montero Sport has a timing belt. This is true for both the 3.0 and 3.5 engens. It is recamended to be changed every 60,000 miles. But be karfull as thay are interference morters...
A little to the right in the front part of the engine. Buy the part and you will see the the perfect match near the front/right area in your engine, with a small hose on one end.