Stuck Thunderbolt distributor rotor

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Griff 4, Aug 7, 2020.

  1. Griff 4

    Griff 4 New Member

    14
    May 27, 2019
    Bayliner 325
    two 350 cubic inch 250 hp Mercruiser engines Bravo II
    It's distributor cap time again. Does anyone have a new secret method about removing the pesky stuck rotor without destroying it? I know the service manual says to use 2 screwdrivers and pry up on opposing sides of the distributor. I haven't tried the screwdriver method yet. Thanks for your expert opinions. Griff
     
  2. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Once rusted on, you’ll probably wind up breaking the rotor to remove it.
     
  3. HawkX66

    HawkX66 Active Member

    178
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    You could pull the distributor, flip it upside down and let some PB Blaster etc soak in. You could also freeze it. Steel shrinks more than plastic if I'm not mistaken.
     
  4. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    It's only plastic. Split it with a chisel or Dremel.
     
  5. HawkX66

    HawkX66 Active Member

    178
    Jul 27, 2020
    SE Virginia and Mass
    1997 Sea Ray Sundancer 290DA
    454 L29 Carb w/ Bravo III
    I would have said the same thing, but he was asking how to do it without breaking it.
     
  6. Griff 4

    Griff 4 New Member

    14
    May 27, 2019
    Bayliner 325
    two 350 cubic inch 250 hp Mercruiser engines Bravo II
    Thanks all, for your expert advice! I followed the service manual this time and used 2 screwdrivers on opposing sides to pry up the pesky rotor. Tapped it a little with a small hammer prior to equally prying up. And the last time I did this job a slight smear of silicone grease was on the shaft. The problem is that the shaft rusts onto the rotor. A better quality shaft material is really needed. Griff.
     

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