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Motorola Alternator Bearings, Part Numbers?

Discussion in 'Early CJ5 and CJ6 Tech' started by teletech, Aug 21, 2020.

  1. Aug 21, 2020
    teletech

    teletech Member

    Santa Cruz, CA
    Joined:
    Aug 20, 2016
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    236
    My alternator is getting LOUD, but still works. I'd love to have the bearings in-hand before tearing it down. Has anyone got the part # for the bearings?
     
  2. Aug 22, 2020
    Dandy

    Dandy Member 2024 Sponsor

    Estherville IA
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    Feb 10, 2008
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    FWIW parts book says for a 35 amp motorola
    Front 927097
    Rear 938535
     
  3. Aug 22, 2020
    teletech

    teletech Member

    Santa Cruz, CA
    Joined:
    Aug 20, 2016
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    236
    Thanks for that, but what I really need are the trade numbers or sizes since I don't imagine my Jeep dealer is going to be much help. :)
     
  4. Aug 22, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    This site says it's a 6302 and 6305. BALL BEARINGS
    They provide dimensions which you could compare with only partial disassembly.
     
  5. Aug 22, 2020
    teletech

    teletech Member

    Santa Cruz, CA
    Joined:
    Aug 20, 2016
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    236
    I actually just took it apart NTN made the bearings and they are a 6200 in the back and 6203 in front.
    The grease seals had aged enough they popped out pretty easily, so I washed out the bearings, regreased, and popped the seals back in.
    Usually I'm not in that big a rush, but as we are pretty close to some of the wildfires raging in CA and I'm not about to leave my great-grandfather's Jeep behind should the order come, I figured I'd best make sure it wasn't going to have problems on the road.

    6200 is 10mmID, 30MM OD, 9MM thick
    6203 is 17x40x12 for those counting
     
    Last edited: Aug 22, 2020
  6. Aug 22, 2020
    Dandy

    Dandy Member 2024 Sponsor

    Estherville IA
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    Feb 10, 2008
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    So much for spending time looking up parts for you......
     
  7. Aug 22, 2020
    Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Virginia Beach, VA
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    Apr 28, 2011
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    Motorola Alternator
    what's that :whistle:
     
  8. Sep 2, 2020
    teletech

    teletech Member

    Santa Cruz, CA
    Joined:
    Aug 20, 2016
    Messages:
    236
    Got the bearings and can confirm those are good numbers.
    It's also worth noting that unlike most alternators the front bearing is held in the front housing by a clip. You can get to it by one of the front windows cut in the alternator. Life is much easier if you release that clip and press the whole armature out before trying to remove the front bearing from the shaft. I put the clip back in but honestly think it might be better to just skip it since it's not like the bearing can go anywhere.
    Alternator is silent so now I can hear how old and grumbley my water pump is.
     
    Last edited: Sep 2, 2020
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