valve cover leaking after valve check

Discussion in 'GS Boxers' started by mtrdrms, Dec 4, 2012.

  1. mtrdrms

    mtrdrms Been here awhile

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    So I pulled the valve cover to check the valves on my 07 and once I put it all back together the covers are seeping just a bit. I cleaned them and the mating surfaces well enough. My question is, should I have to replace the gaskets after pulling the covers? Never had this prob before but. I haven't done a valve check when it was 20 degrees outside either. Thanks.
    #1
  2. eric2

    eric2 ®egister this:

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    The gaskets generally survive valve checks, but its possible you may have torn one. I've had some seepage from the spark plug gasket so I make it a point to rotate them and make sure their reseated properly.
    #2
  3. def

    def Ginger th wonder dog

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    The OHV cover gaskets on my 2001 GS are OE and have never leaked....never will.

    Handled properly and wiped dry of oil prior to re-installing them is the secret. Make sure you wipe dry the surfaces on the cylinder head and OHV cover as well. Insure that the spark plug donuts are aligned correctly.
    #3
  4. Mr Head

    Mr Head PowerPoint ADV

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    Check the spark plug gasket is rotated so it seals. That is the usual, first place if all were cleaned prior to re-assembly.
    Noting should be broken or torn it is only the really extra-credit types who are able to tear these up. :evil
    #4
  5. mtrdrms

    mtrdrms Been here awhile

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    Got it. Operator error.
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  6. Mr Head

    Mr Head PowerPoint ADV

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    I did this on my 1150 after decades of working and riding bikes. oiled a gortex boot really well. :huh

    #6
  7. Dan Alexander

    Dan Alexander only happy when sad

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    I thought you were supposed to lightly oil the gasket before reassembly .... don't have a manual around to check.
    #7
  8. pcwirepro

    pcwirepro Aspiring Adventurer

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    And dry some more
    #8
  9. roadtrip22

    roadtrip22 Been here awhile

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    Always dry and make sure everything is clean the kits you can usually get have a spark plug seal in there for a purpose. I recommend always replacing that seal BC it's a leak your never see till it fouls out your plug
    #9
  10. def

    def Ginger th wonder dog

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    Just the opposite. Dry the gaskets and mating surfaces so there is no oil path from inside the OHV cover to the outside. Use caution when handling the gaskets so as not to bend or crimp them.

    And no hogging down on the OHV cover fasteners otherwise, you'll be whining about the stripped threads in your cylinder head.

    Just a small excerpt from my 2001 BMW REPROM;

    • Install cylinder head cover.
    e Caution:
    Make sure that gaskets are correctly seated. Gaskets
    and sealing faces must be free from oil and
    grease.
    X Tightening torque:
    Cover screw................................................... 9 Nm
    #10
  11. MotorradMike

    MotorradMike MIL-TFD-41

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    You sure about the 9Nm def?
    I have 8Nm.
    Not being picky, that's over 10%.
    #11
  12. Wallowa

    Wallowa Long timer

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    Must just be me...but using a torque wrench and getting that type of accuracy is impossible..like I said at least for me.. 8 or 9 Newton Meters is damn little [5.9 vs. 6.6 ft/lbs].:D
    #12
  13. jzeiler

    jzeiler ADWrencher

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    8 or 9 Nm just means turn until the fastner bottoms out and then STOP!
    #13
  14. JimVonBaden

    JimVonBaden "Cool" Aid!

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    #14
  15. JimVonBaden

    JimVonBaden "Cool" Aid!

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    :deal

    Jim :brow
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  16. GS Addict

    GS Addict Pepperfool

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    I'll stay with BMW's instructions, always done it that way, never had a problem.:deal

    "Caution: Make sure that all seals are correctly seated. Seals and sealing faces must be free from oil and grease."
    #16
  17. rocketman1

    rocketman1 rocketman1

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    From an engineering point of veiw, I would think that for gaskets that involve a turning part to tighten on them like a oil filter gasket then you would have to oil it so that the gasket does not pucker or mishapen went being twisted on.
    But for a gasket that you are fastening a fixed part too. Like a valve gasket, then I would say it would need to be dry.
    If the gasket in this case is oiled then there is a chance that when it is tightened upon by the valve cover, there could chance that it would slide/squeeze to some extent away from the joint. And maybe leak a bit
    Sounds logical aye
    #17
  18. Dan Alexander

    Dan Alexander only happy when sad

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    That's what I thought ... thanks :D

    I recall from my K-bike days that valve cover gaskets worked much better at stopping leaks when they had a light coat of oil. Helps the seal to 'seal' it seems
    #18
  19. def

    def Ginger th wonder dog

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    Just a small excerpt from my 2001 BMW REPROM;

    • Install cylinder head cover.
    e Caution:
    Make sure that gaskets are correctly seated. Gaskets
    and sealing faces must be free from oil and
    grease.
    X Tightening torque:
    Cover screw............................................. ...... 9 Nm

    I snug these fasteners by hand using a screwdriver handle. No torque wrench.

    Am I sure about these torque values?

    You be the judge.
    #19
  20. Mr Head

    Mr Head PowerPoint ADV

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    In 40 years of working on and riding motorcycles I have always assembled valve covers dry and clean.
    #20