Toyota 90916-02570 Belt, V

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This procedure applies only to 2009 and earlier models. The water pump, alternator, and, on 2003 and earlier models, the air conditioning compressor, are driven by one serpentine belt. Because of their composition and the stresses they are subjected to, drivebelts stretch and deteriorate as they get older. They must, therefore, be inspected periodically. The serpentine belt has an adjuster bolt which applies tension to the belt via an idler pulley. With the engine off, open the hood and locate the drivebelt. With a flashlight, check the belt for separation of the adhesive rubber on both sides of the core, core separation from the belt side, a severed core, separation of the ribs from the adhesive rubber, cracking or separation of the ribs, and torn or worn ribs or cracks in the inner ridges of the ribs. Also, check for fraying and glazing, which gives the belt a shiny appearance. Both sides of the belt should be inspected, which means you will have to twist the belt to check the underside. Use your fingers to feel the belt where you can't see it. If any of the above conditions are evident, replace the belt. Loosen the lock nut, then loosen the tension on the belt by turning the adjuster bolt. Remove the belt. Route the new belt over the pulleys. Tighten the adjuster bolt until the belt is adequately tight. Tighten the lock nut. Make sure the belt is properly centered in the pulleys. To replace a tensioner that exhibits binding or a worn-out bearing/pulley, remove the drivebelt then unscrew the mounting nut. Installation is the reverse of the removal procedure. Install the drivebelt, then tighten the nut.