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What do you do before you remove a serpentine belt?

Updated: 8/19/2019
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13y ago

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If you can't find the routing diagram under the hood, take a picture or draw it out yourself. Once you've got that done, use either a 3/8" ratchet (or a tool specially made for the purpose, if you prefer) to lever the serpentine belt tensioner away from the belt to loosen it.

With the belt loosened, gently let the tensioner return to its normal position. There should be plenty of slack in the belt by now, but if there's not, slide it off the smooth pulleys, like the idler pulley, first.

Installation is exactly the opposite: loop the belt around the pulleys according to your diagram with the tensioner as the last pulley to be added. Make sure the belt's grooves are lined up with the grooves on the pulleys--all of them!--before starting the engine. Start the engine and let it run for just a couple of seconds, then shut it off and make sure the belt hasn't slipped off any pulleys.

Be careful: some FWD vehicles, like a few Cavaliers and Sunbirds, were put together funny, either by design or because an engineer somewhere didn't like do-it-yourselfers. On those cars, you'll see that a motor mount is right in the middle of the pulleys. In that case, you'll have to jack up the engine and transaxle slightly, remove the mount and support the engine with jackstands, then replace the belt.

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Q: What do you do before you remove a serpentine belt?
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