1968 Jeepster Commando With A Coughing Dauntless V6

Discussion in 'Jeepster Commando and Commando Tech' started by Nekaf&Jeepsterdude, Aug 29, 2016.

  1. May 7, 2017
    teletech

    teletech Member

    Live Oak, CA
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    I don't think you need to worry about the flutter in your vacuum, the V6 is an odd-fire so I would expect the impulses of both intake and exhaust to be a little lumpy.
    Do you get any noticeable blowby?
     
  2. May 8, 2017
    Uncle Vin

    Uncle Vin Sponsor Sponsor

    Long Island, New...
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    Bad link. It brings you to a generic site.
     
  3. May 8, 2017
    Focker

    Focker Rust Never Sleeps Staff Member Sponsor

    Tri-Cities WA
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    Unfortunately the site is down. Fortunately some of us copied and pasted Rich's stuff before it happened.

    Link - hei-distributor-cap-1-terminal
     
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  4. May 17, 2017
    Nekaf&Jeepsterdude

    Nekaf&Jeepsterdude 1968 Jeepster Commando, 1951 M38a1C

    The Netherlands
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    What do you mean by "blowby"?
     
  5. May 17, 2017
    Nekaf&Jeepsterdude

    Nekaf&Jeepsterdude 1968 Jeepster Commando, 1951 M38a1C

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    Interesting reading! Does this also apply to a pertronix ignitor conversion?
     
  6. May 17, 2017
    commanlerwrangdo

    commanlerwrangdo Member

    Cleveland, Ohio
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    "Blow-by" is the combustion gases that escape past the rings and sneak into the crankcase. Remove the oil cap when running at full at operating temp and look for smoke coming out - that's blow-by.
     
  7. May 18, 2017
    Nekaf&Jeepsterdude

    Nekaf&Jeepsterdude 1968 Jeepster Commando, 1951 M38a1C

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    Thanks for explaining that to me. I will check that next time I'll take her out.
     
  8. May 18, 2017
    commanlerwrangdo

    commanlerwrangdo Member

    Cleveland, Ohio
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    No problem, we are all here to assist each other keeping our Jeeps running.
     
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  9. May 28, 2017
    Nekaf&Jeepsterdude

    Nekaf&Jeepsterdude 1968 Jeepster Commando, 1951 M38a1C

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    Pulled out the dipstick and do not see any "blowby"...

    If I open the oil cap on the left cover I do see smoke coming out, is that "blowby"? What does that indicate, worn rings?
     
    Last edited: May 28, 2017
  10. May 28, 2017
    teletech

    teletech Member

    Live Oak, CA
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    Hard to say without being there, as some small amount of leakage is normal.
    Rings would be the most common cause, but valve stem leakage could be a factor as well.
    Running as rich as you were, you might have washed the bores.
    (that is to say, if you have enough fuel in the cylinder it washes the oil off the cylinder walls and rings resulting in extremely high rates of wear.)

    There are various chemical solutions people have used over the years in case it's just sticky rings. These usually revolve around warming up the engine, draining the oil and filling the crankcase with something of a solvent nature, running it unloaded for a minute or three to circulate the cleanser and then letting it sit for a time before doing an oil change.

    Reading back to the early posts, your low compression on #1 could contribute to a vacuum flutter.
    I will say that I was fighting weak ignition and once I got that sorted, my vacuum got a lot more steady.
     
  11. May 30, 2017
    Nekaf&Jeepsterdude

    Nekaf&Jeepsterdude 1968 Jeepster Commando, 1951 M38a1C

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    Thanks for your input. Hopefully it is not due to damage to the cylinders and rings. I only drove for short distances with the rich mixture since it only occurred with a full fuel tank... Will it damage that quickly?

    A rebuild will be one of the options as soon as I have one of the M38a1's back on the road, or an engine swap...
     
  12. Jun 2, 2017
    teletech

    teletech Member

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    I doubt you did any harm in that short a time and there certainly is no reason to not drive it now that you have quit dumping fuel.
    You can clean the crankcase, change the oil, drive it a bit and then let a compression test and your road experience be your guide about weather the motor needs overhaul work.
     
  13. Jun 6, 2017
    Nekaf&Jeepsterdude

    Nekaf&Jeepsterdude 1968 Jeepster Commando, 1951 M38a1C

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    Ok, will do that!
     

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