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This pulley attaches to the main crankshaft pulley and drives the Air Conditioner belt.
As these pulleys age the rubber isolator between the outer an inner pulleys will erode and the outer pulley will slip or move forward on the main crankshaft pulley and the pulley will need to be replaced.
Sometimes there in an associated squealing sound when the pulleys slip over one another, and there are times when it's silent right up the point of failure.
Check this pulley as your engine and vehicle ages; it if comes apart, it can destroy other things in its path like the cooling fan and even the radiator.
You can keep track of pulley slippage over time by using a paint marker and painting a stripe across the face of the pulley. If the lines shift from being in alignment, you have a slipping pulley, and it's time to replace it.
Toyota - Japan
2022 10 18