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Irregular belt noise on 240 1991 200

Hello,

My 240 was making more noise than usual recently. (This seemed to be when AC was on.) A week ago, my AC clutch/AC was not functioning well and overheated the belt and blew the fuse. So I replaced the fuse and turned off the AC. I was still able to drive.

Today my car was making huge noise and was not moving well. So I was ready to call the towing company. However, after a few tries, the car was making normal sound and the belt seemed to be working fine and I was able to drive home. My belts are about one-year old. I just received the new belts today which I ordered just in case.

So should I be replacing all belts or just AC belts? Or should I just tighten up some belts? Why still the belt buring smell although I did not turn on the AC? Thanks.








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    Irregular belt noise on 240 1991 200

    Hi,

    Since you replaced the fuse to the AC, It would seem more logical that the magnetic clutch, that’s in behind the AC compressor pulley, may have shorted from being overheated by current until the fuse blew out!

    The blown fuse is the only thing pointing to the AC and you didn’t say if you lost the belt off of the pulley?
    it may have wrapped around several times and whacked the wire that connects up to the AC.

    The AC belt may have taken on some of the heat, but a magnetic coil, will stink too!
    It has coils of wire that are coated or in cased with a resin that cause a nasty smell.
    Much like a hot or overheated electric motor will do!

    Another thing that can stink like a rubber belt is the Harmonic Crankshaft pulley.
    It drives all of accessories and will make a rumbling noise because too!
    It has rubber in the middle like a sandwich.
    It could keep producing a burning rubber smell as well!
    Some people paint a line or use chalk temporarily, from the center out and across outer edges to see if it’s slipping around.

    Paint works for a longer time reference.
    It gives up to a casual look down, while lumbering on scenic tour under the hood, along a beltway instead of driving on one! (:)
    You might want to use a glove box vanity mirror an old used rear view mirror for its length and narrowness. (:-).
    The vanity mirror comes in handy too, for the not so vain men in the world, who can work on cars with a grease rag!

    [(:-)

    Phil









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      Irregular belt noise on 240 1991 200

      Hi. Thanks for comments.

      I saw smoke from the belt area so I thought it was the belt being melted. But it looks fine today. But today for once, the car was steering heavy with loud noise. So I suspected power steering belt. (Is that the one located vertically to the power steering at the top?). I plan to drive very little and take it to my trusted mechanic next week. I just hope not to get stuck on the road until then.

      AC(R-134 converted) was never cold anyway. I refilled the freon last year and that did not make much difference. Is this a good idea to replace the compressor? The new, generic one seems to run at $300.

      If I want to try to tighten the power steering belt because of the noise, should I try to loose the 13mm bolt at top and tighten 10mm long bolt nut? (I am not even sure that power steering belt is one making the noise.) All belts were replaced last year and they seem fine, and they did not seem that loose.

      Jay








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        Irregular belt noise on 240 1991 200

        Hi,

        The power steering is above the AC compressor and that pulley below drives it.
        If the Power Steering pump isn't turning at a decent speed, then the steering wheel will be harder to turn, especially, if stopped still at a light or while parking.

        Your belt is apparently not working very well now, to turn the Power Steering Pump.
        It's unlikely that a Power Steering pump will lock up and cause it's belt to get hot!
        There's just not that much to it or work for it to perform unless you are turning the wheels!

        When Adjusting "A" belt its tension should only deflect about the thickness of the belt down from a straight line.
        This is when, pushed down, moderately, with a strong thumb pressure or without adding a wrist and a forearm for leverage, in between its two pulley's should be sufficient to not let the pulley's be spun by hand, if you could grip them. Real tight is not good for bearings of all the accessories.

        The TRICK is to find out what has caused ONE year old belts to get hot in the first place!
        The Crankshaft pulley drives both of those at the same time.
        So that belt is thicker or heavier to convey more power over to the other two!
        This is the lowest belt coming over from the center of the engine.

        It's possible that the Crankshaft pulley is slipping internally to make a noise and not able to turn the accessories. That can be a rumble or squawk,
        But squawks and squeals are more reserved for belts!

        Heat getting generated it's not good news!
        If it's a hot bad magnetic coil, of the clutch plate assembly is one thing or even a possible BEARING is another?
        If it's locked up inside the pulley, of the AC compressor, then that would cook a belt too!
        Same belt, just the opposite end!

        These are separate units, from the actual compressor unit itself.
        The Bearing only needs to spin freely when the AC is off.
        When the AC is "On" the whole affair turns together, so, the bearing is not required to spin at all! It goes back and forth during cycling.
        It's happening, all the while, delivering power to the Power Steering Pump never stops!

        I hope you haven't over charged the Air Conditioner as that will overload the belt as it would make is stop under the belt, just like a bad bearing!

        The AC has to be "balanced" charged or it will not work correctly.
        There is a slight 10% loss in efficiency with R134 when compared to R12.
        This system has a preset orifice and a fixed weight of charge specification that must be adhered too!
        A little under is better than way over!

        How long has it been since that was done?

        If the AC belt was off, then, both pulley's should turn freely except for the drag of the PS pump.
        You may have to remove it to feel things out!

        There are two bolts that have to be loosened on the compressors body, front and rear, in order to replace the AC compressor belt. The rear one can be difficult to get loosened but not that hard really!
        Only then, can you used the Ten Millimeter long "adjusting screw" to pull the compressor away and snug it over!

        I hope I help you grasp the picture of how things work down there.

        As least if a mechanic works on it, you'll have an idea as to what happened more clearly when he tells you.
        Either one of you can do this above, if your GAME and have a few wrenches.

        There's nothing like a down home experience, welcomed on your terms!
        (:-)

        Phil








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          Irregular belt noise on 240 1991 200

          Thank you for comments. I will study your comments carefully.

          Meanwhile, my car started with giant squeak sound and power steering no longer worked. I was able to drive home. When I opened the hood, my AC belt (AC to Engine) is gone/broke off. My power steering belt (AC to power steering) has stopped. I am so thankful that the car is still operating.

          Jay







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