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Cracked timing cover?

Discussion in 'Early CJ5 and CJ6 Tech' started by Project71-5, Jul 16, 2009.

  1. Jul 16, 2009
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    In the middle of replacing my fuel pump, I noticed what appear to be cracks on the timing chain cover. It looks like a rock or something impacted the cover at some point in time.

    Do these look like cracks or is it just dirt/grease stuck in imperfections on the surface of the casting? The cast surface is very rough, so it could be grease I think :?

    http://rides.webshots.com/album/573568371ddpOnt
     
    Last edited: Jul 16, 2009
    Project71-5, Jul 16, 2009
    #1
  2. Jul 16, 2009
    EricM

    EricM Active Member

    Southern California
    Joined:
    Dec 19, 2007
    Messages:
    1,019
    Joe,

    The pictures aren't showing up for me. I see red X's.

    Eric
     
    EricM, Jul 16, 2009
    #2
  3. Jul 16, 2009
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    I don't think those are anything to worry about. I seem to recall my timing cover having some cracks like that in the surface as well.
     
    sparky, Jul 16, 2009
    #3
  4. Jul 16, 2009
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    Updated link, try now
     
    Project71-5, Jul 16, 2009
    #4
  5. Jul 16, 2009
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,360
    Just small inclusions in the casting.
     
    Patrick, Jul 16, 2009
    #5
  6. Jul 16, 2009
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
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    I was thinking that its just cold shuts on the surface. Really couldn't see the cover cracking that much and still be in one piece.
     
    Project71-5, Jul 16, 2009
    #6
  7. Jul 16, 2009
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    Fuel pump is in and is pumping fuel to the filter!

    Just gotta go get some oil to replace the fuel contaminated stuff in there now and then I'll fire it up :D
     
    Project71-5, Jul 16, 2009
    #7
  8. Jul 16, 2009
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,349
    Joe, those are actually caused by the release agent they used to use in the die cast mold. The stuff was like wiping vaseline or grease on the mold, the metal would not always burn it off when it was injected and it would leave those little swirls on the surface. Nothing to worry about.
     
    Mcruff, Jul 16, 2009
    #8
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