oil leaking around spark plugs flat 6

Slant 6 Engines

  1. hardlucktattoo

    hardlucktattoo Well-Known Member

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    OK I have come down to where I have some internal wear in my flat 6 oil is bubbling around the spark plugs the question I have is do i have to rebuild the hole motor or is there another way I can go...the car runs good sounds good no knocks no nothing just a little smoke thanks
     
  2. OldmanRick

    OldmanRick Well-Known Member

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    The fact that it runs decent and has no noise is a good sign as far as the low end, bearings and such. I have no experience with the flat head engines, but it sure sounds like a rebuild is in your future. I'd have to think that enough oil to bleed past the plugs means that the rings have probably seen their better days.

    I want to keep tabs on this thread as a learning tool for these engines. Good luck with however things turn out. :thumbrig:
     
  3. 805moparkid

    805moparkid Slant and AFX Guy

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    so is this a slant or a flat six?? i assume you mean you have oil coming around the spark plug tubes??
     
  4. hardlucktattoo

    hardlucktattoo Well-Known Member

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    Its a flat 6 its bubbling around the spark plug the plug closest to the firewall is the worst but only a couple of them are doing it
     
  5. godfatherofchry

    godfatherofchry Legandary Member Legendary Member

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    try some strate 30 or 40 wt. oil in it when that motor was built there was no 5/10 or 20/50 im sure it could use a rebuild but I would try that first hell you might get another 100,000 out of it!!!if you're in a warm area that's where my money will be just a suggestion............Artie
     
  6. hardlucktattoo

    hardlucktattoo Well-Known Member

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    I also added some MMO to the oil someone said on another forum it might me the wrong plugs and there not seating right but I know its gonna need to be rebuilt
     
  7. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    If it has the wrong plugs in it, they can leak.
     
  8. hardlucktattoo

    hardlucktattoo Well-Known Member

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    Someone said use j series plugs can you just rebuild the top end
     
  9. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    There is no top end on a flat head. It's all in the block. You don't go on what "someone says". You look it up by application. What kinda vehicle are we workin on? Year model? Engine size?
     
  10. cjh

    cjh Well-Known Member

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    Flat 6 ....?????.....like a Corvair/Porsche/Subaru H6 engine ?????
    or did you mean a Flat Head 6 ????
     

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  11. hardlucktattoo

    hardlucktattoo Well-Known Member

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    1950 Chrysler windsor
     
  12. GEO

    GEO Sarcasm Inc.

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    You got the wrong plugs ,

    I think your plugs have crush washers to seal them.

    And are you sure that they are tight enough?
     
  13. 57dodged100

    57dodged100 Well-Known Member

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    A compression and leak down test would provide very useful information related to your question related to if it's time for a rebuild.
     
  14. hardlucktattoo

    hardlucktattoo Well-Known Member

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    I have autolites in there now I changed them when I got the car someone said to use champion
     
  15. hardlucktattoo

    hardlucktattoo Well-Known Member

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    I'm gonna try and do a compression test this week
     
  16. Oklacarcollecto

    Oklacarcollecto Life is an experiment

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    Bingo. Install the correct plugs and see what happens. These old flat head engines are different than our valve in head engines.
     
  17. godfatherofchry

    godfatherofchry Legandary Member Legendary Member

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    I think I would still use the strat wt. oil??
     
  18. 805moparkid

    805moparkid Slant and AFX Guy

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    naw the multi weight is a better oil, cools the engine better. but you would want to be using like 10-40 or 20-50 for sure
     
  19. Danarchy

    Danarchy Well-Known Member

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  20. hardlucktattoo

    hardlucktattoo Well-Known Member

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    i think i need to drive the shit out of it to see if it stops lol
     
  21. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    You need the right plugs for it and then straight weight oil like Artie said.
     
  22. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    We still don't have an engine size. 230?

    Autolite #306

    Champion #592
     
  23. godfatherofchry

    godfatherofchry Legandary Member Legendary Member

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    you kids are sumthing are youtrying to start sumthing,?????:violent1::finga:no!!!!!!!!!!
     
  24. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    Multi viscosity oil was created for one thing. Weather. So it can be one weight in cold weather and another in warm. That's all. It has no better cooling properties than any other oil. Modern oils are very advanced nowadays, including single weights. Single weight oils have been used a very long time with great success. The modern additive packages is in them as well, so they are every bit as good as a multi viscosity oil. These old motors will run with transmission fluid in the crankcase. They don't give a damn as long as they are lubricated.
     
  25. C130 Chief

    C130 Chief Mechanical Genius

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    So, with a flathead, ANY oil that builds up around the spark plugs is oil that has migrated out of the cylinder. This means two things. First, you have a significant oil coating of you cylinders and chamber, and, more importantly second, you have a compression leak around your plugs.

    If the engine's oil consumption is otherwise acceptable, focus on the plug seal. First, I would thoroughly clean the plug threads and seats. Then, with properly torqued horizontal seat gasketed plugs, if oil migration is still a problem, try a little Permatex #2 on the plug threads.
     
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