Having trouble with R100 tranny

Discussion in 'Old's Cool' started by helgaairhead, Jan 22, 2007.

  1. helgaairhead

    helgaairhead Guest

    Hi all.
    Friend of mine are stuck in Equador, Quito, with a broken tranny.
    He is trying to rebuild the gearbox, but found the parts to expensive.
    So he is looking for someone or something which can transform the BMW part number over to other aftermarket part numbers. Like having part number (BM's) for the bearings in the tranny and then just walk over to the store and by Timken or SKF bearings which just fit right in.

    Anyone who have been into this before?

    Bike: R100GS/Sidecar rebuild with dobbel mono swingarm and car-wheels


    Regards
    Helgaairhead
    #1
  2. Andy-Gadget

    Andy-Gadget Any bike can go anywere

    Joined:
    Jul 5, 2006
    Oddometer:
    1,369
    Location:
    Hobart, Tasmania
    The only really "special" bearing in the box is the front input shaft bearing inner race, this is a standard parrallel roller bearing outer with a removable inner race, it is the inner that is different.
    What makes it special isn't the size but that it is longer than standard so the front seal can run on it rather than the shaft.
    The bearing that most often gives grief is the front bearing of the output shaft, but if the bike has sat for some time, the back bearing of the output shaft can bugger up as it is closest to the breather.
    All bearings other than the front input shaft bearing are shallow groove ball bearings and so aren't weird or very hard to find.
    The problem with any boxer gearbox rebuild is the shimming to get the dogs in the correct relationship to the gears, and the end float correct.

    Wish your mate good luck for me.

    Gadget
    #2
  3. AntonLargiader

    AntonLargiader Long timer

    Joined:
    Aug 28, 2003
    Oddometer:
    4,354
    Location:
    Charlottesville, VA
    #3
  4. Joerg

    Joerg Long timer

    Joined:
    Jul 10, 2001
    Oddometer:
    1,356
    Location:
    Lausanne, Switzerland
    Hi,
    If you merely type "BMW R gearbox revision" in google.com, you land on my gearbox page ... the parts list for the different years is in the "What you need" section, together with the tools list.
    #4
  5. kixtand

    kixtand Long timer

    Joined:
    Apr 24, 2004
    Oddometer:
    2,177
    Location:
    Lexington, KY
    #5