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Thread: Water Pump - Mechanical Fan

  1. #1
    Join Date
    Jul 2009
    Oakland, CA
    My Cars
    1981 320iS

    Water Pump - Mechanical Fan

    Hi all. I have an '04 wagon, and recently replaced the water pump, thermostat, coolant expansion tank, and hoses. While re-installing the mechanical fan, I cross threaded the waterpump stud/shaft, that the fan attaches to. I don't want to buy a whole new water pump. Anyone know specs on that stud. I'd like to find a die to rethread, then install the fan properly. Thanks for any and all help.

  2. #2
    Join Date
    Aug 2014
    Lawrence Kansas
    My Cars
    2004 325XI/2008 GL320
    Not sure of the thread pitch but if you can't get that sorted, you can always drop in an E-fan from a manual trans E46 and eliminate the mechanical fan entirely. Plug and play.

  3. #3
    Join Date
    Jan 2008
    My Cars
    2000 323i E46 wagon, '743.0Csi, '733.0CS, '67 912,
    "While re-installing the mechanical fan, I cross threaded the waterpump stud/shaft"

    it should be hand tighten until bottom out. You can't cross threaded by hand? People use wrench to torque the fan nut during installation and this is why they have to use special tool to remove. Hand tighten only, and then no need to use locking tool next time, but just a monkey adjustable wrench and tapped with a hammer is enough.

  4. #4
    Join Date
    Oct 2005
    San Francisco, CA, USA
    My Cars
    '94 318ic, '00 323it
    You might consider a new water pump. Just a quick glance at metric left hand dies and the cost is almost that of an after market water pump.
    Alpine 318ic FTMFW!

  5. #5
    Join Date
    Jul 2011
    Arlington, VA
    My Cars
    2018 BMW M240i
    I concur with the recommendation of a new pump and an electric fan. The thread on the old pump is furbar’d. The electric fan is much more reliable than the mechanical thermal clutch.

  6. #6
    Join Date
    Jan 2016
    My Cars
    2001 525it
    I would fix what need s to be fix and nix the electrical fan your cars coolant system was fine til you cross threaded the fitting. lesson learned

  7. #7
    Join Date
    Jan 2007
    San Francisco, CA
    My Cars
    e46 330 Touring, e53 m54
    I was going to say same thing, get E-fan. And you are in luck, I live in Oakland hills and got E-fan from a manual car from E46.

    Its way better and you car will not sound like truck, it will be a lot quieter too without that clutch fan.

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