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Noisy belt Intermittent noise, specially when it starts, coming from the serpentine belt or pulley. How do I adjust the belt tension?

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It is spring loaded ,when worn belt slip and mini groove are too wide and belt is stetch remove belt and turn pulley to check bearing,than change belt

Posted on Apr 22, 2014

Testimonial: "Thanks, Richard. I would do that as soon as possible. Makes sense."


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Serpentine belt noise around steering power united and alternative

The usual causes of a noisy belt - a squealing noise - around a pulley is because of either incorrect tension of the belt, or it has become worn/cracked/shiny on the inside and needs replacement.

In some instances the pulley itself can become worn.

The first thing you should do is check the tension of the belt - not too tight and not too slack. You haven't said what sort of car you have, but it will either have an automatic or manual tensioner.

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It could just be belt noise or it could be from a worn bearing in one of the pulleys.
If you like you can buy a can of belt grip from an auto store. Just spray the fluid onto a damp cloth and wipe it over the belt surfaces as well as you can whilst the belt is on the car and let it dry. If the noise goes away or substantially changes you will know it is the belt that is the noise source.

If the serpentine belt has not been replaced for years, replace it with a quality part and re-check for noise. While it is off you can spin some of the pulleys and see if you can find a noisy one. If you do then it needs to be replaced before it seizes. If the bad pulley is on the belt tensioner unit then you should replace the entire tensioner unit.

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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.
  • 7 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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    If it is a squealing sound when you start up or water splashes in that area you need to adjust the tension or replace the belt. If the noise is actually coming from the pulley it may be the bearings on that alternator being bad.

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    here you go. please rate, thanks

    Item Part Number Description 1 8620 Drive Belt 2 10300 Generator Pulley 3 6C348 Idler Pulley 4 6B209 Drive Belt Tensioner 5 3D673 Power Steering Pump Pulley 6 2E884 A/C Clutch Pulley 7 6A312 Crankshaft Vibration Damper Pulley 8 8A528 Water Pump Pulley
    s1w~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: The drive belt tensioner has no provision for adjustment and will be damaged if forced to travel beyond its operating range. Automatic tensioners are calibrated at the factory to provide the correct amount of tension to the belt. There is no need to check tensioners for proper tension.
    NOTE: Drive belts (8620) with automatic drive belt tensioner (6B209) do not require adjustment.
    NOTE: When a drive belt is installed new or reinstalled after a service procedure, the drive belt does not fully seat into pulley grooves until engine has run for several minutes.
    This vehicle is equipped with:
    • a V-ribbed serpentine accessory drive belt.
    • automatic drive belt tensioners.
    New drive belts should be of the same type as originally installed.
    Drive belt chirp is a regularly occurring chirping noise that occurs due to:
    • pulley misalignment.
    • excessive pulley runout.
    It can be a result of a damaged pulley or an incorrectly replaced pulley that was not correctly aligned.
    To correct drive belt chirp:
    • determine the area where the noise comes from.
    • check each of the pulleys in that area with a straightedge to the crankshaft pulley (6312) for front accessory drive and the water pump drive pulley to the water pump.
    • look for the accessory pulley to be out of position in the fore/aft direction or at an angle to the straightedge.
    Drive belt squeal is an intermittent noise that occurs when the drive belt slips on a pulley during certain conditions such as:
    • engine start-up.
    • rapid engine acceleration.
    • A/C clutch engagement.
    Drive belt squeal can occur under the following conditions:
    • The A/C discharge pressure goes above specifications:
      • The A/C system is overcharged.
      • The A/C condenser airflow is blocked.


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    Your '90 Benz has a belt tensioner that is automatic. You just insert the correct tool to ease the tensioner pulley, (The tool is inserted into the bracket for the tensioner pulley), to the left as you're facing the car. Then slip your serpentine belt off. Reinstallation is a reversal of this process. (I believe it's to the left, don't quote me on that)

    The radiator support in front, should have a diagram of how the serpentine belt goes on the pulleys.

    If your serpentine belt slips, then the belt tensioner pulley assembly is bad, needs to be replaced, or the serpentine belt itself is worn out.

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