Rebuilding The Late Model Mercruiser Raw Water Pump

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by MasterFab, May 19, 2015.

  1. MasterFab

    MasterFab Active Member TECHNICAL Contributor

    Aug 17, 2010
    Wallkill, NY
    2002 340 Sundancer, Rescued, Restored, Modernized, and now Sold
    8.1L Horizons, ZF 63 V Drives

    The bearings are pressed onto the shaft 1st, then the entire assembly should be installed into the housing. The assembly is secured with a snap ring, so the fit into the housing should not be that tight, but you may have to gently press the bearings into the housing, especially an older housing that may be corroded, damaged, etc. After honing though, you should be having that much trouble. Make sure there is no damage to the housing - even a small dent could stop the bearings from sliding in easily.

  2. boatrboy

    boatrboy Active Member

    Oct 3, 2006
    Orange, CT
    1999 270 Da
    7.4 MPI w/B3
    Thanks Dale - I'll have to mic up both again. It looked like it was about a half thou interference and may need to be opened up to be line to line.
  3. Brite Idea

    Brite Idea Member

    Nov 5, 2011
    Long Island, New York
    270 Sundancer 2000
    twin 4.3 TBI Merecrusier Alpha Gen II counter rotating drives
    The bearings need to be pressed in.
  4. Steve Calzolano

    Steve Calzolano New Member

    Feb 12, 2019
    2003 280 Sundancer
    Twin Mercruiser/Bravo III
    Hey Masterfab, Your post from 2015 was very helpful. However, my tolerance ring is not a clip type but a crush type. Does it crush simply by attaching the outer seal? I have a 2003 5.0 mercruiser. Thanks

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