Burning oil

Slant 6 Engines

  1. 66 Valiant wagon

    66 Valiant wagon Member

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    hi! So my 66 slant is burning oil bad! I’ve replaced the valve stem seals and the guides didn’t feel bad? With my calibrated hand wiggle I mean.
    It has a lot of oomph tho? I can hit the gas and she’s moves but also leaves a dark cloud. Could it be the valve stems? Or the piston rings? I’m thinking why does it run so well if the rings are bad?
    Thanks in advance!
     
  2. TrailBeast

    TrailBeast Slightly Twisted Member

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    What color is that "dark cloud"?
    Blue is oil, and black is too much fuel.
     
  3. Donnie514

    Donnie514 FABO Gold Member FABO Gold Member

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    It's not the guides, although that's what you want it to be.
    Valve guides puff oil out the exhaust on a start up like in the morning or after sitting in a parking lot for awhile.
    So now if the cloud is blue plan on spending some money and doing a lot of work.
     
  4. 66 Valiant wagon

    66 Valiant wagon Member

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    It’s dark grayish. It’s gotta be oil because I literally have to add oil about every 250 miles.
    I’ve recently replaced the oil pan gasket and it only leaks a small bit from the rear main I’m guessing? It’s that location.
     
  5. 66 Valiant wagon

    66 Valiant wagon Member

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    You’re right I was hoping it was the guides.
     
  6. Garrett Ellison

    Garrett Ellison Amateur driver on public roadway, do not imitate..

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    Read your plugs and do a compression test. My gut instinct says broken oil ring if its pumping oil on acceleration. Normal ring wear usually gives you smoke on decel. Also, is your dipstick the one that came on the car or has it all been changed?
     
  7. George Jets

    George Jets 1967 Dart 2 Door FABO Gold Member

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    Willing to bet the rings are stuck on the pistons with carbon build up.

    Have had good luck giving engines the Seafoam trick to loosen up the stuck piston rings on the pistons and get them to move and seal again.

    I pint of seafoam in the engine oil to get things started. This takes a week to break down and loosen up the carbon. Take it out and run it and warm it up real good . . Half hour road trip.

    Then pull all the spark plugs and pour in an ounce of seafoam into each spark plug hole a let the engine sit for a week and soak.

    After a week roll the engine over by hand a couple of revolutions, then put the plugs back in with a fresh oil change and filter with thin 5w 30 motor oil and a pint of new seafoam. This thin oil will flush out the fine carbon particles and the rings will begin to seat again.

    Take it out and run it good and warm it up real good. This will help the rings to expand out and cut in the new seal to the cylinder walls. Like breaking in a fresh engine all over again.

    Have had multiple successes doing this to car engines and diesel engines.

    Have bought a diesel tractor that was smoking out the exhaust. Owner says needs an overhaul, I said OK, here is the 650 dollars for your diesel tractor.

    Took it back, warmed it up dropped the oil out. Fresh oil and filter with pint and 1/2 of seafoam. Ran it at 1/2 throttle for an hour, then let it sit for 2 weeks soaking to break down the carbon.

    After 2 weeks fired it up and ran it till warm, drained that oil out. Put in a fresh oil change of 15w 40 Rotella and ran it for 30 minutes at half throttle,

    No more smoke, works for me . . .

    This is the diesel tractor pictured here still running good after 2 years, no smoke.

    20190318_144900.jpg
     
    Last edited: Oct 9, 2019
    • Thanks! Thanks! x 1
    • Dana67Dart

      Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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      I would pull
       
    • 66 Valiant wagon

      66 Valiant wagon Member

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      Thanks George Jets I’ll give that a try. Certainly can’t hurt. Otherwise I’ll just rebuild it. It’s just there’s so many other projects! Ugh I’m running outta space.
      Haha
       
    • George Jets

      George Jets 1967 Dart 2 Door FABO Gold Member

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      Yes, get the rings wet with Seafoam and let them soak for a couple weeks, that is the trick.

      One gas inline 4 cylinder IH farm tractor we did, poured Seafoam on top of the pistons. Left the drain plug out with an oil pan inder the engine. Let that one sit for a month.

      The desolved black carbon that dripped down out of it into the pan was just like Carbon Black Paint.

      So you know the seafoam was breaking down the carbon buildup around the rings and running down into the pan.
       
    • George Jets

      George Jets 1967 Dart 2 Door FABO Gold Member

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      Here is another Ford 3415 Diesel Tractor that smoked out the exhaust at time of purchase. Did the same seafoam trick as above and the new oil change flushes.

      No more smoke out the exhaust pipe.

      Working well and going on the 3rd year of service here in MN cutting grass with a 84" 3 point hitch finish mower.

      Ford3415.jpg

      Pretty amazing to get these engines to shape up good again, without having to overhaul them.
       
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