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Thread: Fan clutch always engaged

  1. #1

    Fan clutch always engaged

    Hi,
    is it possible that fan clutch failed in that way that is engaged all time even if cold?

    Chris

  2. #2
    E500E Guru
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    Re: Clutch fan

    Factory, ACM, china?

  3. #3
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    Re: Clutch fan

    The aftermarket seem to always run and kit disengage at higher rpm.

  4. #4

    Re: Clutch fan

    Clutch is oem. I belive from new never changed. Done 216 tkm

  5. #5
    .036 Hoonigan™
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    Re: Clutch fan

    Quote Originally Posted by chrisro View Post
    Hi,
    is it possible that fan clutch failed in that way that is engaged all time even if cold?
    Yes. However, this is generally not a failure, but rather a "modification" by a previous owner. One of my cars had this done (original / OE Sachs clutch), took me forever to figure out why the fan was always engaged regardless of temps...


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  7. #6

    Re: Clutch fan

    Quote Originally Posted by gsxr View Post
    Yes. However, this is generally not a failure, but rather a "modification" by a previous owner. One of my cars had this done (original / OE Sachs clutch), took me forever to figure out why the fan was always engaged regardless of temps...

    thanks

    Sounds interesting! How the modification was done? Is it possible to undo it?
    cheers
    Chris

  8. #7
    .036 Hoonigan™
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    Re: Clutch fan

    Quote Originally Posted by chrisro View Post
    Sounds interesting! How the modification was done? Is it possible to undo it?
    Yes - if, and that's a big IF, the clutch was modified to be engaged all the time. The 124 owner's "bible" showed one method using a small bolt drilled into the bimetal spring, set to push the spring outwards a mm or two. Alternately the spring mounting ears/ends could be bent outward slightly which could cause the same effect. It should be possible to reverse either modification, however the adjustment is extremely precise... movements of 0.5-1.0 mm make a big difference.

    You won't be able to tell what's going on without removing the clutch from the engine and taking some close-up photos of the spring on the front face. Keep in mind that if you do anything wrong, and the spring pops out of the clutch with the engine running, you will end up with both a destroyed radiator AND destroyed fan clutch....


  9. #8
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    Re: Fan clutch always engaged

    thanks dave- forgot about the stu ritter mod. He was up in Denver... maybe it was necessary at higher altitude? At 600 ft, the 6.0 liter runs fine with a good fan clutch. I still wonder if the 850W fan setup off a newer car won't work(W221?).
    I've got several extra clutches.

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