Explore Subaru Outback Idler Pulleys. Shop Subaru Outback Tensioner Pulley Assembly & Subaru Outback Idler Pulleys Replacement. In maintaining your Subaru Outback, the idler pulley's health is crucial. These pulleys ensure the serpentine belt operates smoothly, but when they emit a squeaking noise or your belt shows uneven wear, it's time for a replacement. Extend their lifespan by routinely checking for proper tension and alignment. When selecting a new idler pulley, opt for ones made of durable materials like steel or thermoplastic, ensuring longevity and peak performance. Installation is straightforward, but always verify compatibility with your Outback's model year for a seamless fit, enhancing your online shopping experience with confidence in getting the right part.