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671 turbo issue?

Discussion in 'Engines' started by Boomer, Jun 22, 2018.

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  1. Boomer, Jun 22, 2018
    #1
    Boomer

    Boomer Senior Member

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    Just got the boat back in the water...was cruising great then bam!! Grey smoke out of the exhaust..pulled her back and while motor was idling there was a metallic sporatic clanking going on above the tranny in the area of the turbo...good oil pressure and temp was good..shut her down and limped home...had bad smelling grey smoke backing out of the Walker air sep....how can you tell if turbo went bad? Can you tell by spinning the fins?
  2. d_meister, Jun 23, 2018
    #2
    d_meister

    d_meister Senior Member

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    It may be obvious when you access the intake turbine with the air filter and hoses removed. The visible turbine should have no scratches or marks on it. Then, using nothing more robust than your finger, there should be no detectable side-to-side motion of the turbine, and only the slightest (if any) in-and-out play. The turbine should spin easily.
  3. Boomer, Jun 23, 2018
    #3
    Boomer

    Boomer Senior Member

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    Thanks...will check it...missing a lot of oil in the motor
  4. d_meister, Jun 23, 2018
    #4
    d_meister

    d_meister Senior Member

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    The turbine shaft floats in a layer of oil in the bearings. It might be that the exhaust side oil seal is gone, allowing oil to be pumped into the exhaust to burn, possibly explaining the gray smoke. but don't quote me on any of it, since I've never seen a turbo on a 671:). If it were going into the intake side, there should be black smoke, as Ralph suggested in the overheating thread.
  5. Boomer, Jun 23, 2018
    #5
    Boomer

    Boomer Senior Member

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    Thanks
  6. Capt J, Jun 23, 2018
    #6
    Capt J

    Capt J Senior Member

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    If it was pumping it into the intake side, you'd see blue smoke. Black smoke is generally unburnt fuel...…. grey can be unburnt fuel as well but can be other things.
  7. Capt Ralph, Jun 23, 2018
    #7
    Capt Ralph

    Capt Ralph Senior Member

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    I worried he dropped a valve and punched a piston.
  8. Capt J, Jun 23, 2018
    #8
    Capt J

    Capt J Senior Member

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    Combined with the overheating, I'm guessing a cracked liner.
  9. Boomer, Jun 23, 2018
    #9
    Boomer

    Boomer Senior Member

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    Hope everyone is wrong...lol...I am worried that it pumped out over 3 gallons of oil on a few minutes
  10. MBevins, Jun 23, 2018
    #10
    MBevins

    MBevins Senior Member

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    DO NOT run that engine until you get professional on site guidance. I once dumped a little more than that in about a half hour. Kissed that engine good bye.
    It's $30K by the time the smoke clears to rebuild.
  11. Boomer, Jun 24, 2018
    #11
    Boomer

    Boomer Senior Member

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    Clearly understood and agreed with!
  12. Boomer, Jun 24, 2018
    #12
    Boomer

    Boomer Senior Member

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    Congrats capt. ralph...you are today's winner...missing a valve stem on the aft piston...spring is laying on top of the head...this is going to be expensive...probably punched a hole in the piston also as you said
  13. Capt Ralph, Jun 24, 2018
    #13
    Capt Ralph

    Capt Ralph Senior Member

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    Those are the later 4 valve heads. You will need a proper shop to look the whole head over carefully.

    When the head comes up, you will probably find burnt valve seats and edges of the valves missing also.
  14. Capt Ralph, Jun 24, 2018
    #14
    Capt Ralph

    Capt Ralph Senior Member

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    For my notes, Please look at the injectors, lil 1/4" round tag on the side.
    Need numbers stamped on and color of tag.
    Also, Please post pics of inter-cooler, and blower.
    Thx
  15. MBevins, Jun 24, 2018
    #15
    MBevins

    MBevins Senior Member

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    I would urge you to have a good look at the other head as well. I had the exact same problem a few years back. Dropped the valve while cruising took a week to get home on one engine. The following season the other engine started to show the same smoke. Called my mechanic back to have a look. He said everything was fine. I decided that peace of mind was worth a few bucks so I insisted he pull the head. Sure enough a valve was just starting break apart. We caught it before any damages to the cylinder. Rebuilt the head and went cruising. Best money i ever spent. Of course YMMV.
  16. Capt Ralph, Jun 24, 2018
    #16
    Capt Ralph

    Capt Ralph Senior Member

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    Agreed.
    At least pull the side covers off and send a bore scope up and look at the valves & seats on the other engine.
    Lack of use does cause a lil rust stain on the seats. This stain will get hot. Down hill from there.
  17. Boomer, Jun 25, 2018
    #17
    Boomer

    Boomer Senior Member

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    Pics sent...m15 injectors...can't get a good pic of them..sorry
  18. Capt Ralph, Jun 25, 2018
    #18
    Capt Ralph

    Capt Ralph Senior Member

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    They will be in your hands soon enough.
  19. Boomer, Jun 26, 2018
    #19
    Boomer

    Boomer Senior Member

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    Lol
  20. Boomer, Jun 26, 2018
    #20
    Boomer

    Boomer Senior Member

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    Will get the other head boroscoped