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Clyinder block base gasket

Discussion in 'XJ Technical Chat' started by sybe, Jul 22, 2016.

  1. sybe

    sybe Active Member

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    After taking the header pipes and i was able to get a better view of the leak and it is coming from the base gasket. What threw me off and still is throwing me off is that the fin above the gasket had oil on it, so i thought it was from the head gasket. Today the head gasket is dry and the base gasket is wet.

    I took a photo of the aftermarket gasket sticking out from the cylinder block/base. Does that look like a good seating?

    The other thing i thought about if the rubber orings around the cylinder walls could be the issue. I hate hate hate that i have to pull it all back a part.

    I hope nothing got damaged. When i drained the oil today there was a lot of evidence of metal on metal wear.
     

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  2. Stumplifter

    Stumplifter Well-Known Member

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    You should try to keep your trials and tribulations in one thread . . . Easier to trace the history of what has been done.
    If memory serves me this is the third time you are suspecting/ finding an issue with the o-rings?
    First set o-rings - original, tired and worn out?
    Second set o-rings - wrong size?
    Third set o-rings - right size but now metal on metal wear is suspect about them?
     
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Where are you getting your parts from?
     
  4. sybe

    sybe Active Member

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    Points up and right.

    I am trying to see what could be the problem and looking at issues that i had during the install to see if it would cause the oil leak. I am not saying for a fact that it is, just asking if it could.

    I pulled the cylinder head off and took some photos and there is definitely something wrong.

    When i rotated the crank to check the cylinder walls for scratches i was watching a very small amount of oil seep up around the rings. I dont remember the rings doing this before i replaced them.

    The bore size is 63 mm if anyone is curious.

     

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    Last edited: Jul 22, 2016
  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The rings won't keep oil from weeping past unless they are under compression. It's the pressure that forces the rings outward to seal.

    Even so that's a bit more oil than I'd expect to see. How many milse since the ring refresh?
    Did you hone the cylinders?
    Did you measure the cylinders to make sure that only new rings were needed?
     
  6. sybe

    sybe Active Member

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    Zero miles. I haven't gotten farther then idle cause of the oil leak and smoke.

    Cylinders were honed measure everything and it was all in spec.

    I am at a complete loss.
     
  7. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    In that case don't worry about the oil you see weeping past the rings. That's normal with new rings.

    Are you absolutely positive that the leak is coming from the base of the cylinders?
    If so then pull them and look for nicks on the cylinder base, and the case deck.
    Rechecking your work is a hassle, but never a bad thing to do.
    When you re-assemble go ahead and use a gasket dressing just to help everything seal.
    I like this stuff: (spray it on the gaskets and allow to tack up as directed).
    [​IMG]
     
  8. rocs82650

    rocs82650 Well-Known Member

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    +1 ^. Good stuff. Also make sure the oil transfer seals are seating as well as the o-rings under the jugs.

    Gary H.
     
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  9. sybe

    sybe Active Member

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    I used that stuff when put the gasket on to play it safe. so i am at a loss
     
  10. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Hmm.... you're positive that it isnt just from the valve cover gasket? There are several pathways that oil can work its way down to the head or base joints without being obvious. The same is true of a leak at the cam chain tensioner.
     

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