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Thread: Rear engine seal replacement

  1. #1
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    Rear engine seal replacement

    I'm going to replace my clutch for it slipping with 40k on it, so it is probably the rear engine seal leaking or the tranny seal leaking. I have type in rear engine seal on forum search & I am over loaded with alot of threads , can't find one on replacement, haven't look through all of them. I was wondering if someone had advice on finding one or on changing the rear seal. I was told on the phone from a dealer you need a special tool for this or you can make one, never have seen one. I can't find in the clymer manual on changing this seal either, was wondering if anyone could direct me on that to. On the tranny seal from what understand is that you just take it out & put the new one in, nothing tricky about it. Thanks for any help in advance.

  2. #2
    Left Coast Rider
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    Its always helpful to post up the model of bike you have but this link might help...

    http://www.bmwmoa.org/forum/showthre...-rear-oil-seal

    Here's another...

    http://www.bmwmoa.org/forum/showthre...clutch-pushrod

  3. #3
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    Yep, that would be helpful. 2004 R1150RT. Alot of good information in the threads, Thanks.

  4. #4
    Registered User GKman's Avatar
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    Think I would pull the starter first and check for oil. Don't know of another cause for slipping but I'd just want to know before a tear-down.

  5. #5
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    on your RT, it could be a bad rear main seal, a bad trans input seal (less likely), or a bad clutch slave cylinder. given the low miles but hi years (relatively speaking)... clutch is most likely in my mind.

    i'd either order those parts in advance with an understanding that they could be returned if unused, or just purchase once you know where the damage is.

    in your manual, i'd first look for rear main in the engine section. if not there, maybe clutch.
    Ride Safe, Ride Lots

  6. #6
    Pepperfool GSAddict's Avatar
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    Pull the starter and you will see where the wet is.
    A dental mirror and a mini maglite are useful tools
    Engine seals don't leak very often, transmission seals are more common especially if they don't have the felt ring glued to the outside and the better rubber (brown)
    Early seals were black rubber.
    You may also be contaminating the disc with brake fluid if your slave cylinder is failing.
    '
    Ufda happens..........

    It's all about the details.

  7. #7
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    I have order the seals for rear main seal & tranny seal. I ordered from beemerbone yard a friction plate that is oil proof, it cost $245 they had the regular plate for $99, but I thought it would be worth the extra. Don't think it is the slave cylinder because the fluid is full for it. I found in the clymer for the rear seal replacement, it is in chapter 5 pg 180. Did order a slave cylinder from the bone yard figured might as well change it while I'm at it. still don't fully understand how the put the rear seal in with the tool you make, but once I have the seal probably will understand more then.Thanks for the help.

  8. #8
    Registered User mpmarty's Avatar
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    You may also be contaminating the disc with brake fluid if your slave cylinder is failing.
    No brake fluid in clutch system AFIK it is mineral oil. (like baby oil?)
    Marty - in the western Oregon mountains.'06RT, (gone '04RT, '86 Venture Royal, '81 Yamaha Virago920, '82Suzuki GS1100GK, '76 Suzuki GT750, Triumph 750 Bonneville, BSA Road Rocket 650, 61" Harley knucklehead)

  9. #9
    not so retired henzilla's Avatar
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    Quote Originally Posted by MPMARTY View Post
    No brake fluid in clutch system AFIK it is mineral oil. (like baby oil?)
    1150's have brake fluid
    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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