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Loosen the bolt right below the tensioner screw and then tighten. Once it is tight enough, tighten the bolt back down and your done. Hello' Unless you are talking about the timing belt, there is not serpentine belt on a Lexus ES300. The timing belts is the one that runs thru the two camshaft, the water pump and the crankshaft. This belt can easily be tighten just like the above user say, however, be very carefull with the tensionomer, cause it has a pressed shaft on it that coul be dangerous.

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18y ago
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Q: How do you tighten the serpentine belt on your 1992 Lexus ES300?
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