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I replaced the alternator but can't get the belt back tight

How do you tighten belt bac

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Try replacing the belt and check the tensoner

Posted on Jan 04, 2009

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ALTERNATOR BELT NEED ADJUSTING AND REPLACING IT GLAZED. WHEN DRIVE BELT GET GLAZED SHINY CAUSE IT TO SLIP AND SQUEAL.REPLACE ALTERNATOR DRIVE BELT. AND ADJUST IT DRIVE BELT TENSION BY TIGHTEN THE UNTIL YOU CAN PRESS DOWN ON THE BELT IN THE LONGEST RUN. YOU NEED TO PRESS DOWN BELT AND GET A 1/4 TO 1/2 INCH DEFLECTION IN BELT.THE BELT CANT BE TOO TIGHT WHERE WHEN YOU PRESS DOWN AT IT WONT GIVE IN NONE TOO TIGHT, WILL CAUSE PREMATURE ALTERNATOR BEARING FAILURE IF DRIVE BELT TOO TIGHT.

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  • Locate the two belts on the left side (passenger side) of your Mitsubishi Lancer. The outer belt is a serpentine belt, operating four pulleys and the inner belt is your alternator belt.

  • 2

    Follow the serpentine (outer) belt to the three pulleys lined up vertically near the front of the engine compartment. Locate the middle pulley, which is the tension pulley for the belt.

  • 3

    Loosen the bolt on the middle pulley with a socket wrench by turning counter-clockwise. Do not remove the bolt, just turn it a couple of times. Loosen the tensioner bolt on the side of the of the pulley, facing the front of the vehicle.

  • 4

    Remove the serpentine belt and then loosen the bolt on the alternator. With the alternator loose, move it forward so that the alternator belt loosens up and then remove belt from the pulleys.

  • 5

    Install the new alternator belt by placing it over both inside pulleys. Tighten the tension on the alternator belt by moving the alternator back and keeping tension on it by holding it back with a long screwdriver. While the alternator belt is tight, use a socket wrench to tighten up the bolt on the alternator.

  • 6

    Place the serpentine belt back on the pulleys and then use a socket wrench on the bolt on the front of the tension pulley. Once the serpentine belt is tight, tighten up the bolt in the middle of the tension pulley.

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    Start the Mitsubishi Lancer's engine to test the alternator belt and make sure it is working properly. Once you have verified it is working, turn the engine off.

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    How to put the alternater belt back on?


    slacken the alternator bolts then slip the belt on the pulleys,using a long screwdiver behind the alternator,lever it out to tighten belt so that the longest part of the belt between pulleys has 1/2 inch movement(too tight and your alternator will need new bearings very soon...)then do up the bolts,check belt tension after all bolts tight to confirm not to tight/loose.

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    disconect positive battery terminal. and feel the tension on the laternator belt. you will need to bring it back to this tension.

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    2.) loosen bolts holding wires to alternator and connect wires to new alternator

    3.) Place alternator in engine, replace bolts but dont tighten

    4.) put belt in place, it will be slack, use your tire iron or a piece of pipe or wood to pry the alternator back, to bring tension on the belt. You pry the alternator to pull the belt as TIGHT AS POSSIBLE. while holding strain, on it, tighten the bolts.

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    The timing belt is not on the outside of engine. What you are describing might be the belt tensioner. The bolts you speak of in alternator are the mounting bolts. If the "smooth" wheel is vibrating, then replace the wheel. That is the belt tensioner.

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    Unplug the connector on the back of the alternator, remove the bolts holding alternator to the mounting bracket.
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