Head Gasket with Gasket Sealer?

Discussion in 'Airheads' started by sh1bby69, Oct 3, 2012.

  1. supershaft

    supershaft because I can

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    Now we're talkin'! :lol3 But hey, it's better than welding on quarter inch thick grinding pads. Talk about making your own problem. That's a good point since I actually jack up my engine and THEN tighten down my engine mounts. Of course, IF I had warped heads, I would mill them. Every little bit helps. Good point! Especially since I never considered getting into them what I would call fun. At least not on the street. It's one thing hitting a bump or dip or getting into them because you just damn near crashed and it's another thing gettting into them because you are seriously hauling the mail. In my experience, something has GOT to give every time. I usually manage by reducing my speed but man you have got to be careful and not back out of the throttle too much or you are going to be into them more than your were to start with! :lol3
    #21
  2. ME 109

    ME 109 Long timer

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    The choice of sealant used in the cylinder base application is critical, if you only want to do the job once.
    Three bond and Yamabond are up to the job, where some other high temp silicones like permatex are not, in my experience.

    One must ask, what is the point of using a cylinder base o ring when it does not work?

    Regards the leaking valve covers, start by re-surfacing the valve cover sealing face by removing the studs and using a piece of glass and wet+dry paper to achieve a flat surface. I start with a coarse grade of 120, followed by 240, and finish with 320. It is easy to see if the covers are warped after just a few rubs on the coarse paper.
    A liberal spray of WD40 or similar on the wet+dry assists greatly.
    Rubbing in a figure 8 pattern and turning the cover 180 degrees repeatedly will assure a good job.

    Once a flat surface on the valve cover is achieved, placing the cover back on the head without a gasket will show if the head is warped by the presence of a visible gap between the head and cover. Holding a light under the head will easily show any gaps.

    [​IMG]
    #22
  3. sh1bby69

    sh1bby69 Been here awhile

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    Thanks for the info!

    Sent from my Galaxy Nexus using Tapatalk 2
    #23
  4. supershaft

    supershaft because I can

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    I have never seen non crashed valve covers be off enough to matter. It's always been the heads in my expereince. You can rock a straight edge on top of them if they are warped. They swell up right in the middle where the valve cover stud is. The head/cylinder gasket surface is most often just fine and the valve cover gasket sealing surface can be warped all to hell.
    #24
  5. bmwrench

    bmwrench Long timer

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    I agree.
    #25
  6. ME 109

    ME 109 Long timer

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    It depends on how much warp matters. It all adds up. No warp can only be better.

    In the last 12 months I've refurbished about eight pairs of valve covers and sold them on Ebay. Some with spirited riding abrasions, some with a fall over scratch.
    All of the covers needed the full treatment of coarse to fine paper to achieve a flat surface.
    Just my observations.
    I only worked on covers with light damage that could be removed by filing to produce almost good as new covers.

    [​IMG]
    #26
  7. boxerboy81

    boxerboy81 Stay Horizontal

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    Noice Jeff. :clap

    Last time I did the valve clearances, the valve cover leaked for a day or so. I wiped it clean, then it stopped. It hasn't leaked since, but the leak moved to the oil pressure switch instead. Damn moving leaks have got a mind of their own!





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    #27
  8. Padmei

    Padmei enamoured

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    I reckon the ones that leak out the end of the exhaust pipe are the worse:D
    #28
  9. disston

    disston ShadeTreeExpert

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    Sounds like my last girlfriend. Actually sounds like any one of them, ever.
    #29
  10. bmwrench

    bmwrench Long timer

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    Amen.
    #30
  11. Wirespokes

    Wirespokes Beemerholics Anonymous

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    ...blowin' gaskets right and left, are they?
    #31
  12. sh1bby69

    sh1bby69 Been here awhile

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    Well what I did was use gasket sealer on the engine side and just kept the valve cover side clean. I had to go in and adjust the valve time but I may have to go back in do and adjust the rocker blocks to zero play. So fast though I have ridden the bike about 10 miles and just developed a drop and nothing more.
    #32