1986 245 making strange clutch noise

Discussion in 'Volvo 240' started by pravinkpant, Nov 20, 2005.

  1. pravinkpant

    pravinkpant Guest

    Hi,

    My 1986 245 (4-speed manual with electrical overdrive) has started to
    make an odd noise when I start from a stop. It's a sort of metalic
    resonant sound, almost as if one were dragging a metal shovel across
    pavement. The sound only occurs when I am in low revs and am getting
    the car moving in first gear. The pitch of the sound is not dependent
    on engine revs. It has gotten progressively louder in the past two
    weeks.

    I've never heard of anything like this. Any idea what this could be?

    Thanks.
     
    pravinkpant, Nov 20, 2005
    #1
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  2. schreef:
    Where does the sound come from?

    I once had a similar problem with my '89 245. The sound came from the
    back and after searching some hours, a friend suggested that maybe two
    things touched each other. After some tries to increase the distance
    between the exhaust and the rear suspension, the sound even disappeared.
    Apparently, some part of the exhaust touched some part of the suspension
    system when the car started to drive.

    But since such a sound is difficult to describe exactly, it may as well
    be something totally different... In my case, I heard the sound for
    about half a second to a second when the car started to move; louder if
    I accelerated faster, and when I accelerated very carefully, it even
    disappeared totally.

    Groetjes,

    Maarten
     
    Maarten De Munck, Nov 21, 2005
    #2
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  3. pravinkpant

    pravinkpant Guest

    "But since such a sound is difficult to describe exactly, it may as
    well
    be something totally different... In my case, I heard the sound for
    about half a second to a second when the car started to move; louder if
    I accelerated faster, and when I accelerated very carefully, it even
    disappeared totally. "

    Yes, that describes exactly the behavior of the sound in my car.
    However, I feel like mine is coming from the front.
     
    pravinkpant, Nov 21, 2005
    #3
  4. pravinkpant

    User Guest

    Probably the heat shield on the headpipe is loose or cracked.

    Bob
     
    User, Nov 22, 2005
    #4
  5. pravinkpant

    James Sweet Guest


    How are the engine mounts? The engine might be shifting and causing the
    fan or something else to rub.
     
    James Sweet, Nov 22, 2005
    #5
  6. pravinkpant

    pravinkpant Guest

    Someone else suggested U-Joints... would failing U-joints cause this
    symptom?
     
    pravinkpant, Nov 22, 2005
    #6
  7. Could be. U-joint noises often produce steady sounds, but they certainly
    experience the driveline torque and can respond to that. They are easy
    enough to check that it would probably be a mistake to overlook them. I've
    heard enough weird noises from U-joints that I don't doubt anything any
    more.

    Mike
     
    Michael Pardee, Nov 22, 2005
    #7
  8. pravinkpant

    Randy G. Guest

    Does it happen _AS_ the clutch is being let out?
    If yes, then I would ask:
    Does it continue _after_ the clutch pedal is released completely?

    If no, then it is probably either the clutch disc or the throwout
    bearing.

    Can you make it happen without touching the clutch pedal (that is, if
    you allow the car to slow in first gear and then accelerate again,
    does the sound repeat as before)?

    If yes, then it is probably some combination of one or more of:

    1) Bad motor mounts or transmission mount. As they age they become
    soft and distort puttiong stress on the drivetrain.

    2) A rattling heat shield on the exhaust manifold or above the
    catalytiuc convertor.

    3) A rattling pre-heat tube off the heat riser on the exhaust
    manifold.

    4) A rattling inner exhaust pipe on the header pipe. This pipe which
    riuns from teh exhaust manifold to the catalytic convertor is double
    walled and the insulation between them eventually breaks down and
    allows the inner pipe to vibrate. This can be loud. Mine vibrates at
    about 2000-2050 rpm (it's like having an audible tachometer).

    5) bad alternator bearings, or bent alternator mount.

    6) bad accessory mount bushings (alternator, power steering, or air
    conditioner compressor mounts).

    7) broken, lose, or missing exhaust system mounts or clamps.

    ....should I keep going? ;-)





    __ __
    Randy & \ \/ /alerie's
    \__/olvos
    '90 245 Estate - '93 965 Estate
    "Shelby" & "Kate"
     
    Randy G., Nov 22, 2005
    #8
  9. pravinkpant

    James Sweet Guest


    Failing U-joints tend to give you clunking when going from forward to
    reverse, and often vibrations at various speeds.
     
    James Sweet, Nov 23, 2005
    #9
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