Oil pooling on exhaust valve.

Discussion in 'Small Block Mopar Engine' started by doogievlg, Jul 11, 2018.

  1. doogievlg

    doogievlg Well-Known Member

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    Tonight I finally found some time to get my engine in. I got it back from the builder back in May and it has been sitting in the engine stand. Well I fought with the headers and finally got the engine mount bolts in when I went to bolt the headers up I noticed oil coming from the exhaust port. Stuck my finger in and there was a puddle on the valve. Same thing was happening on both Exhaust valves on the back two cylinders.

    I am seriously hoping this isn’t a bad seal so I figured I would ask you guys if there is any other possibility. No it is not coming from the valve cover.
     
  2. RustyRatRod

    RustyRatRod Just another dumbass. Technical Editor

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    If it's a new build, it's probably assembly oil.
     
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    • doogievlg

      doogievlg Well-Known Member

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      The engine was broke in on a dyno and has at least five pulls on it. Also isn’t it a bit strange that it is only those two valves with it?
       
    • skrews

      skrews Well-Known Member

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      What kind of valve seals?
       
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      • inertia

        inertia Well-Known Member

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        Pull all the spark plugs, keep them in order, and see what they tell you.
         
      • pishta

        pishta I know I'm right....

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        valve seals are easy, lets hope its not a bad guide. But from an engine builder is not a good sign. Call him before you dig into it.
         
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        • doogievlg

          doogievlg Well-Known Member

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          Not sure. They were done at the shop
           
        • doogievlg

          doogievlg Well-Known Member

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          I may do a leak down test on it and see what that tells me.
           
        • doogievlg

          doogievlg Well-Known Member

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          I dont plan on digging in any farther than doing a leakdown test. I paid for new seals and guides so if there is an issue this engine is going back to him.
           
        • mario03srt

          mario03srt FABO Gold Member FABO Gold Member

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          Doogievig,

          I guess that it did not smoke or otherwise act funny on the stand? Were you there? I can't visualize oil puddle on the valve. It's inverted right? I guess that this was the only time you saw it, did you rotate or crank the engine to create any oil pressure? Is it weeping out? Did you pull a valve cover and take a peek?

          Best of Luck!!!

          Marion
           
        • 4spdragtop

          4spdragtop FABO Gold Member FABO Gold Member

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          I would pull a vc. Probly/hopefully just poor seals.
           
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          • MOPAROFFICIAL

            MOPAROFFICIAL Well-Known Member

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            Show us a pic
             
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            • nm9stheham

              nm9stheham Well-Known Member

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              Any residual oil in the heads will run to the back when you install it and the engine is slanted back. So that may explain being around the back valves. But the oil drain holes ought to keep it from getting backed up high enough to flow over the exhaust guides and past those 2 exhaust stem seal. Edelbrocks will build up a deeper pool of oil back there. Hopefully, the oil drains back there are not blocked up for some dumb reason.

              More than 2 exhaust valves ought to be closed at a given time so you would indeed expect oil elsewhere if it a general valve seal problem.

              I'd start by:
              • pulling a valve cover and see how much oil runs out the back corner
              • make sure those 2 valves HAVE seals
              • use a mirror and look into all the ports and look if there is signs of oiling down the valve stems
              • check the plugs as suggested
               
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              • furrystump

                furrystump Well-Known Member

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                Now it hasn’t run in the car yet? but Because of the angle of the motor I get deeper pools of oil at the rear ends of the heads. What style of valve seals? If they are the o rings it may have just been engine angle and o rings allow some oil through. Did you prime it?
                 
              • doogievlg

                doogievlg Well-Known Member

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                Only ran on the stand. It was 11 PM when I discovered the oil last night so I didn't take the time to pull the valve cover on that side and get a good look at the seal.
                 
              • doogievlg

                doogievlg Well-Known Member

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                I just got off the phone with the engine builder and he said that it shouldn’t be an issue. It did run good during the dyno pulls and there was no smoke with good oil pressure. It still seems very odd to me. I’m still going to do a leak down test on it and check the seals before installing it.
                 
              • rednesss

                rednesss FABO Gold Member FABO Gold Member

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                If they are J heads, the "valve seal" really is just a short umbrella that keeps most of, but not all, of the splashed oil from the springs off of the valve stem. There's always going to be some oil in the guides, if there weren't, the valves would seize up in the guides. I would ask the builder how much clearance they machined into the guides. More clearance, more oil.
                 
              • furrystump

                furrystump Well-Known Member

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                Take a picture of the seal. It could be an umbrella, or a positive seal, or just the square o ring.
                 
              • oldkimmer

                oldkimmer Well-Known Member

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                Take a pic of the pooling also, so u can have proof. Kim
                 
              • 4spdragtop

                4spdragtop FABO Gold Member FABO Gold Member

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                Hope they are viton seals with the metal clip.
                 
              • jimjimjimmy

                jimjimjimmy lobsterman FABO Gold Member

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                any updates ?