1995 Buick LeSabre Logo
Posted on Jan 04, 2011
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Theres a knocking noise we thought it was the tension pulley replaced it replaced serpentine belt replaced alternator the knocking continues its coming from this area of the engine top part

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mike mountain

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  • Posted on Jan 04, 2011
mike mountain
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Noises are difficult to track but since your's is on top, try this-CAREFULLY use a wooden handle (from a broom, or paint roller extension) and place the end against items on top of the engine-the other end, your ear. Be aware of the moving pulleys and the belt, take your time-you can isolate the noise this way, and plan your next step.

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    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.

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    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.

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    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.

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    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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