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Thread: 1994 R1100 RS rear main seal change

  1. #1
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    1994 R1100 RS rear main seal change

    On the rear main seal does the mating surface that seals on the crankshaft angle in towards the engine or out towards the transmission . In other words do you just push it on and let it slide over the shaft or do you have to spread it over the shaft angling inward?

  2. #2
    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by BILLK75 View Post
    On the rear main seal does the mating surface that seals on the crankshaft angle in towards the engine or out towards the transmission . In other words do you just push it on and let it slide over the shaft or do you have to spread it over the shaft angling inward?
    Inwards, pay particular attention to the installed depths of both as well. Record them before removing the old ones. There is a gap between the two which leads to the breather system
    '
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  3. #3
    Quote Originally Posted by GSAddict View Post
    Inwards, pay particular attention to the installed depths of both as well. Record them before removing the old ones. There is a gap between the two which leads to the breather system
    I have been wrong before but I believe the 1994 R1100RS has only a single rear crankshaft seal. I think things changed with later models but I don't remember which year.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  4. #4
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    It does only have a single rear main seal ,how do you get the seal to angle inwards because the hole is approximately 1/4 inch smaller than the size of the crankshaft

  5. #5
    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by BILLK75 View Post
    It does only have a single rear main seal ,how do you get the seal to angle inwards because the hole is approximately 1/4 inch smaller than the size of the crankshaft
    It takes a tool to swell the lip and slide onto the crank end. You could do with thin shimstock as well.

    If you PM me your email I'll send you a .pdf of the pictures.

    From the OE CD (for 2 seals)

    Installing the crankshaft-end radial shaft seal
    • Shape the lip of the radial shaft seal carefully by
    hand (1).
    • Oil the radial shaft seal at the sealing/contact
    surface.
    • Using assembly sleeve, BMW No. 11 5 702,
    mount the radial shaft seal with the closed side
    toward the clutch onto sleeve,
    BMW No. 11 5 703, (2).
    • Remove assembly sleeve (3).
    • Mount sleeve complete with radial shaft seal on
    crankshaft (4).
    • Use drift, BMW No. 11 5 701, together with
    sleeve (5) to drive the radial shaft seal onto the
    crankshaft.
    • Remove sleeve (6).
    Installing the clutch-end radial shaft seal
    • Shape the lip of the radial shaft seal carefully by
    hand (7).
    • Oil the radial shaft seal at the sealing/contact
    surface.
    • Using assembly sleeve, BMW No. 11 5 662,
    mount the radial shaft seal with the closed side
    toward the clutch onto drift, BMW No. 11 5 661,
    with handle, BMW No. 00 5 500, (8).
    • Remove assembly sleeve (9).
    • Using the drift, drive the radial shaft seal
    home (10)
    '
    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

  6. #6
    You need to use some sort of form to get the seal over the crank. A beer can, a yogurt cup, whatever you can find that is the right diameter. For the longest time there was a how-to stickied in the ADVRider forum about this but it's been gone for years. I think it was a yogurt cup that Dana used for that.

    From memory, for the single-seal models (before '98) the BMW tool doesn't overlap the crank much if at all. For the double-seal models it has to, because of the notch in the crank.

  7. #7
    not so retired henzilla's Avatar
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    Doing a double sealed this week, found a tapered spray paint cap this time and fits over crank far enough...had used the typical shaped one the last time. Waiting on seals that were supposed to be here last Wednesday my only headache so far.
    Steve Henson
    SABMWRA MOA Club#62's Flat Fixer/ current forum moderator
    It's not the breaths you take, but the moments that take your breath away-D.Dillon/G. Strait

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