Oil puddeling on intake manifold .Factory 273 4bbl duel exhaust

Small Block Mopar Engine

  1. Dean3001

    Dean3001 Well-Known Member

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    High performance 273 4 bbl duel exhaust get small amount of oil in 2 of the low dips of the intake manifold near the intake bolts right under the carburetor on passenger side, ( intake shows heat , paint burned off, just above area of oiled intake bolts. Any suggestions?
     
  2. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

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    There is a heat riser passage that runs under the intake plenum to help with cold drivability. Exhaust runs in the passage to warm the intake fuel charge. That's where the burning paint comes from. As far as the oil, it is probably coming from a leaky valve cover gasket. Because of the heat in that area, the gaskets often dry out and crack in that area first.
     
  3. Dean3001

    Dean3001 Well-Known Member

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    Thank you, Dean
     
  4. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

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    That's where I would look first Dean.
     
  5. mullinax95

    mullinax95 Well-Known Member

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    Check your intake bolts. Take one of them out and look at it. If it is saturated with oil thats your problem. The intake bolts are open to oil and will actually wick oil up onto the outside of the intake. You already know this. Either use ARP thread sealant or Permatex on the bolt threads. You can use RTV type sealant but I'm not a big fan of it getting into a engine. I just got finished installing new heads and intake to my 360 and used ARP thread sealant.

    My 273 was the really bad about the oil coming around the intake bolts.
    Then try new valve cover gaskets.
     
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    • Dean3001

      Dean3001 Well-Known Member

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      Thank you, good to know.
       
    • toolmanmike

      toolmanmike FABO Staff Staff Member FABO Gold Member

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      Good tip Mully. I never stop learning!
       
    • ir3333

      ir3333 Well-Known Member

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      it will require a bit of sealer on the offending intake manifold bolts as has been suggested.
      I have that T shirt
       
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      • TrailBeast

        TrailBeast Slightly Twisted Member

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        Super common problem.
        Best to do around the bolt shoulder to bolt head also.
        That way you only have to pull the bolts once. :D

        And yes, I have that T shirt.
         
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        • H22A4

          H22A4 Well-Known Member

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          As others have suggested, it's quite likely the intake bolts are wicking up the oil. Try some thread sealant on them and that will likely solve the problem. I used thread sealant on all the intake bolts when I installed my intake last year and haven't had any oil pooling where your does. My neighbour replaced his intake (with no thread sealant) a month after I did and he had oil pooling. He put some thread sealant on them and no more oil.
           
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          • TrailBeast

            TrailBeast Slightly Twisted Member

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            Just an FYI, I adapted a 1/2 hose to an old carpet cleaner, scrubbed the oil spots with dishsoap and sucked it up.
            Worked perfect and didn't make a mess on everything else trying to get it out of there.
             
          • 70 DUSTER CRATE

            70 DUSTER CRATE Well-Known Member

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            What sealant did you use?
            ARP sealant seems to be questionable about it's reliability, on Summit Reviews. I Don't want to do it twice.
            https://www.summitracing.com/parts/arp-100-9904/reviews
             
          • RedFish

            RedFish Well-Known Member

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            my 67 273 2 brl. , I changed that single plane intake for a 73 model dual plane 2 brl. intake. All threads, male and female clean and dry. High temp red RTV was some brand other than Permatex from Oriellys, cost less. 3 or 4 years ago, I forget. One bolt now leaking/wicking in front of cross over on left side. That crossover area does get mighty hot on both sides. Good luck with yours.
             
          • ir3333

            ir3333 Well-Known Member

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            take the offending bolt out,give it a wipe and put any sealant on it.There is no
            pressure on the threads...2 minutes.
            Your over thinking this.
             
          • mullinax95

            mullinax95 Well-Known Member

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            To me the ARP Sealant looks just like "pipe dope". If you ever seen the pipe sealant in a bottle with a brush attached to the lid that's what I'm talking about. Has a paste type texture to it and is white looking. I had to remove my intake and switch out a lifter because it wouldn't pump up. The ARP sealant was still like it was when I applied it on the bolts.
             
          • DartGTDan

            DartGTDan 70-71 Dart GT Fan

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            I too am getting oil puddling on my LD4B intake (which started about a week ago). I understand I must remove and clean the bolts. Do I need to clean the bolt holes? If so, how & with what? After I apply the sealant do I immediately re-install the bolts or wait for the sealant to set up for some time? Once the bolts are re-installed how long should I wait to drive the car?
            IMG_2742.JPG IMG_2743.JPG
             
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            • toolmanmike

              toolmanmike FABO Staff Staff Member FABO Gold Member

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              I pulled the bolts, draped a rag over the holes and blew the oil out with compressed air. Sprayed with break clean and repeat. I used liquid Teflon thread sealant to seal the bolts. Give that a try.
               
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              • moparmandan

                moparmandan FABO Gold Member FABO Gold Member

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                Well to fix it right, you're not supposed to drive the car for two weeks after you seal the bolts.
                ^
                ^
                ^
                ^
                ^
                OR......
                Whenever the package says. LOL
                 
              • Wyrmrider

                Wyrmrider Well-Known Member

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                Hylomar works best and is non hardening so you can R&R or re-torque
                works even if threads are not super clean
                 
              • jimjimjimmy

                jimjimjimmy lobsterman FABO Gold Member

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                Indian head gasket shellac .
                 
              • toolmanmike

                toolmanmike FABO Staff Staff Member FABO Gold Member

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                For sealing bolts?
                 
              • pishta

                pishta I know I'm right....

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                how about fiber washers flanking the steel washer?
                 
              • 66fs

                66fs Well-Known Member

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              • jimjimjimmy

                jimjimjimmy lobsterman FABO Gold Member

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                Darn Tootin
                 
              • DartGTDan

                DartGTDan 70-71 Dart GT Fan

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