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Leaking Valve Cover "Half-Moons"

Discussion in 'XJ Technical Chat' started by Lou627, Jul 9, 2009.

  1. Lou627

    Lou627 Member

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    I did a top end overhaul on my engine and tried to reuse the old (ripped) valve cover gasket. Of course, it leaked. So I put a new one in, and did it right. Now upon start up I get a fast leak/spray of oil from the half moons (on where day and night would meet on the moon :), or where the rubber meets the gasket). Should I be putting some sealant on this area? Or is it possibly the rubber doing its job and shooting oil because of something I may have messed up in the head? Remember the overhaul that was done...
    Thanks, Lou
     
    Lou627, Jul 9, 2009
    #1
  2. bill

    bill Active Member

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    Lou did you change the donuts? They provide the pressure.
     
    bill, Jul 9, 2009
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  3. Lou627

    Lou627 Member

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    I don't have donuts on mine- I believe thats only on the yics models
     
    Lou627, Jul 9, 2009
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  4. bill

    bill Active Member

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    Ahh ok it was a thought
     
    bill, Jul 9, 2009
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  5. stereomind

    stereomind Active Member

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    smear some RTV silicone (like ultra black) on the flat surface of the half-moon and let it cure... reinstall gasket and valve cover. It's possible that the half-moons may need to be replaced... Chacal prolly has them. If not, I've seen them on fleabay.
     
    stereomind, Jul 9, 2009
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  6. Lou627

    Lou627 Member

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    Cool, thinking the same. You had this problem too, eh? I was reading your post while searching the forums :)
     
    Lou627, Jul 9, 2009
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  7. schmuckaholic

    schmuckaholic Well-Known Member

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    I'd like to know how you saw them as separate... those "half moons" are an integral part of the gasket.
     
    schmuckaholic, Jul 10, 2009
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  8. murray

    murray Member

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    Not with the pre YCIS model,it uses a paper gasket with seperate half-moon rubber inserts and allen head bolts around the peripheral of the rocker cover. Cheers, Murray
     
    murray, Jul 10, 2009
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  9. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Edzachary. You need to put a little bead of sealant along the line where the edge of the half-moons meet the paper gasket. Not LOTS, just enough to "squish" into the small gap between the edges of the "moons" and the paper gasket. This assumes the half-moons are still reasonably soft and pliable.
     
    bigfitz52, Jul 10, 2009
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