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How do you install the belt tensioner on a GMC 5.7L?

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2015-07-15 19:41:52
2015-07-15 19:41:52

the opposite way you took it off

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There is a spring loaded tensioner near the top of the belt. Insert a wrench (whatever fits the job) and pull/push against it. Remove the belt.

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There is an automatic tensioner that keeps tension on the belt. THere should be a label in the engine compartment somewhere giving you a diagram of the path of the belt and showing where the tensioner is and which way it turns to loosen the tension. On the 1995 GMC Sierra that I just worked on, I loosened the nut on the front of the tensioner a little, then I used a big pipe wrench on the tensioner itself to rotate the tensioner assembly counterclockwise then removed the belt while still holding the tensioner, then gradually released the tensioner. From looking at it I guess there is a special tool you can use to do this, you might want to check with Advance Auto. or whoever your closest auto parts store is to see if they will loan you the tool.

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Simply purchase the belt for a non air conditioned version of your vehicle and route the belt the same as the old one excluding the compressor

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Open hood Make sure to have a good belt routing diagram Remove belt from accesories by releasing tension using a 3/8 rachet in the provided square hole. Remove belt Remove bolt from tensioner to block Replace tensioner and torque bolt to 32 ftlbs Bump engine over(dont let it start) to ensure belt is installed correctly

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remove serpentine belt center bolt in idler remove, and install new pulleyand rplace belt the way it came off

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If you have only one belt, this is the serpentine belt which runs everything, fan, alternator, AC if you have it, powersteering. To remove it , locate the tensioner which should be on the right side of the engine below the washer fluid reservoir, it will have a 5/8" bolt (I think!) about 2 inches long on it, put a long handle wrench on that and pull to the left to release the tension on the belt. The tensioner has a very powerful spring in it so be careful not to slip and it will take quite a bit of force. After you have the tension released, slip the belt off of one of the components (I useually go for the alternator) and slowly move the tensioner back to its rest position, then just remove the belt and install the new one, there should be a diagram for it on the inside of the hood or on the conduit leading to the air filter. If you have multiple belts its best to replace them all since you will have to take them all off anyways as I remember the fan belt being the one closest to the engine. For this the vairous components are the tensioners for their belts so for instance, if you are removing the alternator belt you will have to loosen the alternator and it will pivot on its mount bracket to change the tension on the belt. The fan belt is the exception as it has it's own tensioner which you will have to loosen prior to removing the belt. Just install the new belts in the reverse order you removed them.

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Most likely you need to look for a grooved pulley that looks like it may not be related to any parts of the engine,(i.e. the water pump pulley, a/c pulley) this is the tensioner pulley. The tensioner pulley on my '97 GMC 5.7L is located just beneath the alternator. Inorder to relieve the pressure from the "tension arm" find a square opening molded into the pulley arm, and insert a breaker bar to use as a lever for relieving the tension. Some vehicles may need a ratchet and socket in order to move the tensioner arm. With a little effort to relieve the pressure, you can now remove the serpentine belt. Most vehicles will have a diagram in the engine compartment showing the specific route for the belt to go on the pulleys. I've found that the easiest way to install the new belt, is put the belt around all of the pulleys first then lastly on the tensioner pulley.

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There should be a sticker under the hood on the radiator support that shows proper belt routing. Alo check belt tensioner for weakness and idler pulley bearings for wear. They go bad very often. The belt goes over the alt,under the idler pulley,over the a.c. comp,under the crank pulley,on the inside of water pump, and around tensioner pulley. There should be a sticker under the hood on the radiator support that shows proper belt routing. Alo check belt tensioner for weakness and idler pulley bearings for wear. They go bad very often. The belt goes over the alt,under the idler pulley,over the a.c. comp,under the crank pulley,on the inside of water pump, and around tensioner pulley.


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