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The tensioner should adjust and take the correct belt and tension it correctly. The reasons for belts coming off and worn / loose belt, wrong belt, tensioner not working, or incorrect belt alignment.
You'd better hope you have a belt routing picture under the hood. Usually the belt is released at the tensioner pulley, which is spring loaded to keep the belt tight. The pulley is unloaded by using a 3/8 long handled socket wrench. Find the square hole.
Look closely as there should be a square one half inch or three eighths inch hole in the tensioner. Place the proper sized ratchet or breaker bar in the hole and turn which ever way loosens the belt. When replacing the belt be sure the belt is properly settled in all the pulleys as if it's off by one spline on any pulley it will quickly damage the belt. Please rate this answer, thanks.
When looking at the front of the engine you will see one of the idler pulleys will have a 3/8 square hole in it,thats for a 3/8 breaker bar or ratchet to fit in to ..hook up the tool and move counter clockwise to rotate the tensioner so you can remove the belt... do the same when installing the new belt
Route the belt as shown below (from autozone.com) but leave it off of the alternator. Use an 18mm wrench or socket on the tensioner pulley and pull toward the front of the car. With the tensioner pulled down, slip the belt onto the alternator completing the diagram. Check routing to verify that belt is still riding on all pulleys.
buy a new tensioner assembley and idler pully and might as well get a new belt while your at it. you will need a 3/8 ratchet a 15 mm socket and a 13 mm socket there is one bolt holding on tensioner remove it discard old tensioner put new tensioner in place and tight bolt. second remove bolt from idler pulley discard old pulley put inton place and tighen bolt. next install belt fallow belt routing digram put head of 3/8 rattachet into hole on tensioner or on bolt head of tensioner pulley depending on style of tensioner and pull or push to create slack in belt push belt into groves on all pulleys and release tensioner
You may not need a serp tool. Look for a place on the tensioner to fit your ratchet into then turn to push tension off. If there is enogh room to get the ratchet in
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