You are watching: What size socket for tensioner pulley
Find the serpentine belt information sticker on the vehicle. This sticker will show the routing path and size of the serpentine belt. Sometimes these stickers also indicate what size socket or ratchet end is required to loosen the belt tensioner pulley. Take note of the socket required if indicated on the serpentine belt information sticker. If the sticker does not provide this information, find the belt tensioner pulley as labeled on the sticker. Inspect the belt tensioner pulley to see what size gap it has for a tool to fit in. If the gap is 1/2 wide and square, as is the case in many vehicles, a standard 1/2 inch ratchet will be sufficient.
Insert the appropriate tool into the gap in the center of the belt tensioner pulley. This will provide the leverage needed to pull the belt tensioner forward and release pressure from the serpentine belt. If the gap is fitted for a 1/2-inch square, yet the ratchet end alone does not reach the gap, a ratchet extension bar may be helpful. Also, some vehicles require a star-shaped Torx bit to loosen the belt tensioner. While the pulley is being pulled forward, slide the serpentine belt off of any pulley it is connected to. Release the pressure from the belt tensioner pulley by removing the tool.
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Inspect the pulley and belt while they are apart. Check the pulley for any cracks and wiggle it to see if it is loose. Belt tensioner pulleys should be tight when pulled horizontally, though they can give some slack when pulled in the direction that they operate. The serpentine belt should be free of excess splitting and should feel solid to to the touch. Replace any belts that have cracks or feel brittle when moved.
Many Ford vehicles require a less common Torx bit to loosen the belt tensioner pulley. These bits are often not included in small socket sets but can be purchased individually at auto parts stores.