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Thread: Oil leak from cam chain tensioner bolt

  1. #1
    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Oil leak from cam chain tensioner bolt

    Well, not sure if this is something to expect when you push the bike to its limits, but it happened.

    Photos are pretty much self explanatory.

    I tightened it as much as I could with spanner, will see how it goes... Don't really fancy a dealer trip for this one.




    Last edited by bmwbadboy; 27th July 2020 at 08:05 AM.

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    Forum Moderator alex's Avatar
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    Re: Oil leak from cam chain tensioner bolt

    Anyone that bought the maintenance manual should be able to give you the torque value.
    The Gen3 has an O-ring on the inside, does the Gen4?
    Gen3 looks like 15Nm in the Haynes manual.

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    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Re: Oil leak from cam chain tensioner bolt

    Quote Originally Posted by alex View Post
    Anyone that bought the maintenance manual should be able to give you the torque value.
    The Gen3 has an O-ring on the inside, does the Gen4?
    Gen3 looks like 15Nm in the Haynes manual.
    Not sure how to torque it properly? Hex socket wouldn't fit there as no space, and I don't have a torque spanner.

    Not sure about oring, I didn't try to open it yet.

    By applied force, it was deffo more than 15nm, more like 50 before it stopped leaking...
    Last edited by bmwbadboy; 27th July 2020 at 08:34 AM.

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    Forum Moderator RyS1000RR's Avatar
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    Oil Leak

    There should be an o-ring inside if you remove the tensioner. If it’s leaking it’s probably because the O-ring has failed and needs replacing. The part number is 0711996340.

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    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Re: Oil Leak

    Quote Originally Posted by RyS1000RR View Post
    There should be an o-ring inside if you remove the tensioner. If it’s leaking it’s probably because the O-ring has failed and needs replacing. The part number is 0711996340.
    Thanks Ryan!

    What about crush washer? Replace as well?


    Also, how does this tensioner look like? Is it just a bolt or something more complex? I can only fit a spanner there, I can try to remove it, but just afraid something might go wrong.

  7. #6
    Forum Moderator RyS1000RR's Avatar
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    Chain Tensioner

    I don’t have my manual to hand at the moment but here is a link to the fiche so you can see the part in question. They are fairly simple to remove and refit.

    https://www.realoem.com/bmw/enUS/sho...diagId=11_7209

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    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Re: Oil leak from cam chain tensioner bolt

    Ok, I think I know the answer.

    I need to replace 4

  10. #8
    Forum Moderator RyS1000RR's Avatar
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    Chain Tensioner

    Quote Originally Posted by bmwbadboy View Post
    Ok, I think I know the answer. I need to replace 4
    Correct.

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    2 YEAR PREMIER MEMBER roadrunner's Avatar
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    Re: Oil leak from cam chain tensioner bolt

    Just a word of warning perhaps!
    I would definitely read up on this before moving this tensioner bolt.
    The engine may have to be positioned before removal. By that I mean turning the crankshaft to a particular position, perhaps TDC, to make sure that the timing cain is not too tight or too slack. The chain may be able to jump teeth if you don’t. Not sure if this can happen but better to be safe than sorry.

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    Oli

  13. #10
    1 YEAR PREMIER MEMBER bmwbadboy's Avatar
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    Re: Oil leak from cam chain tensioner bolt

    Quote Originally Posted by roadrunner View Post
    Just a word of warning perhaps!
    I would definitely read up on this before moving this tensioner bolt.
    The engine may have to be positioned before removal. By that I mean turning the crankshaft to a particular position, perhaps TDC, to make sure that the timing cain is not too tight or too slack. The chain may be able to jump teeth if you don’t. Not sure if this can happen but better to be safe than sorry.
    Thanks a lot!

    I assume me tightening the bolt is fine? It's only if I remove it to replace washer I have to follow the process?

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