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SBF Dart Sportsman oil leak.

Discussion in 'Pushrod Tech' started by Turbohwagon, Jun 29, 2013.

  1. Turbohwagon

    Joined:
    Dec 6, 2005
    So I have the following Combo:

    363 8.2" decked SBF Dart Sportsman Block (Bored 4.125)
    Cometic Head gaskets
    ARP 1/2" Head studs (Torqued to spec, w/ moly lube)
    Block and heads were both machined to the correct surface roughness for the MLS gaskets (Very smooth)

    So when the engine runs for about 5 minutes it starts to drip some oil. I wanted to know where it was coming from, so I added some UV dye to my engine oil and as it turns out the oil is leaking from the far outside back corner at the head/block/HG seam, right under the Outside far back head stud boss. I copper coated these Cometics like a few sources said to, however I still have a leak. I didn't get the instruction sheet for this block, as I bought it as a short block from another guy. The heads/gaskets/studs were all assembled on a stand, so i'm fairly certain I didn't accidentally slide a head or knick a gasket putting it together.
     
    Turbohwagon, Jun 29, 2013
    #1

  2. racesloth

    Joined:
    Nov 8, 2007
    How was the surface finish on block's deck? The MLS gaskets need a smooth finish. Possibley, the leak might be from the top side of the head. Don't know about the Cometic, but on the Felpro's for an 8.2" deck the rivet can get in the way and cause a leak.
     
    racesloth, Jun 30, 2013
    #2

  3. Turbohwagon

    Joined:
    Dec 6, 2005
    Both heads and deck had the correct finish.
     
    Turbohwagon, Jun 30, 2013
    #3

  4. ducatibrian

    Joined:
    Jan 13, 2003
    Rivet in the way or gasket short at head face? No silicone applied in corners of head / gasket?
     
    ducatibrian, Jun 30, 2013
    #4

  5. Turbohwagon

    Joined:
    Dec 6, 2005
    I didn't know anything about the silicone around the corners, but the driver's side doesn't leak at all? I don't see a rivet there either.
     
    Turbohwagon, Jun 30, 2013
    #5

  6. ducatibrian

    Joined:
    Jan 13, 2003
    A little dab at the block, head, gasket in the corners seems to help head off small leaks. I have seen rivets need to be removed for proper fit as well.
    Just a thought...
     
    ducatibrian, Jun 30, 2013
    #6

  7. Turbohwagon

    Joined:
    Dec 6, 2005
    I made sure the rivets were not in the way, because I have heard of that too. Any tips for cleaning off old copper coat? lol.
     
    Turbohwagon, Jun 30, 2013
    #7

  8. ducatibrian

    Joined:
    Jan 13, 2003
    Yeah, elbow grease!
     
    ducatibrian, Jun 30, 2013
    #8

  9. Turbohwagon

    Joined:
    Dec 6, 2005
    I feel compelled to kill it with felpro MLS.
     
    Turbohwagon, Jun 30, 2013
    #9

  10. Gen1SVE

    Joined:
    Sep 13, 2006
    +1

    Both of these issues need to be addressed.
     
    Gen1SVE, Jul 1, 2013
    #10

  11. Turbohwagon

    Joined:
    Dec 6, 2005
    When you guys say the corners of the head gaskets, are you talking about up near the intake gaskets where they sometimes are too short? I know i hit that with some right stuff.
     
    Turbohwagon, Jul 3, 2013
    #11

  12. colormebad

    Joined:
    Jun 10, 2009
    I worked on 2 with that same problem..It was too much copper coat causing the leakage...Put a new set back on dry and no more problems...I think its because they sprayed all layers insted of just the top and bottom, and got too much on them
     
    colormebad, Jul 7, 2013
    #12
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