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Serpentine belt jumping off

Discussion in 'Car Forum' started by 0100010, Aug 8, 2005.

  1. 0100010

    0100010 Millennium Member

    Sep 15, 1999
    My sister in law just had me replace the power steering/AC serpentine belt on her 99 Mitsubishi Galant this evening, the old one was loose and not driving the power steering pump properly.

    Was fairly easy to replace, loosen the tension pulley, route the new belt and tighten the pulley back up. Did it twice, as soon as she would start the car, when the engine "jumped" after initially turning over, the belt would pop right off.

    I don't have a manual for this car, the only reason she brought it to me is cause I'm the only male in the family. I told her she just needs to pony up the $30 bucks or whatever to have a shop replace it; but I'm curious what could be making the new belt not stay on.

    Any ideas? Thanks...
  2. G20man32904

    G20man32904 Deceased

    May 26, 2003
    Melbourne, Fl
    New pump is/may not be aligned 100% correctly. That usually will cause the belt to jump off.

  3. One Ragged Hole

    One Ragged Hole Dis ain't funny

    Nov 13, 2002
    Just hangin around
    Look for the belt routung diagram decal. Sounds like one pully is reversed, or spinning backward.