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Diesel 6-71

Discussion in 'Engines' started by Milka, May 7, 2020.

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  1. Milka

    Milka New Member

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    Recently took over a zombie boat and i need some help..
    (Mis Behavn formerly a 1950's mine sweeper supposedly)
    I'm not mechanically inclined at all and I was told by someone that knows my boat that he believes someone hit the emergency stop upstairs but never reset it on the engine. My Google-fu is failing me please send pic's
  2. Pascal

    Pascal Senior Member

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    You should easily see flaps at the airboxes, attached to a cable. Hard to explain but pretty obvious when you see them
  3. Capt Ralph

    Capt Ralph Senior Member

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    Stright or Natural 671 (671M) usually did not have shut down flappers.
    1950, I doubt it.
    In case of an upgrade, I'll proceed;
    671 T, TI & TIBs (anything with a turbo) did.
    Find a Morse cable that looks like a throttle or clutch control cable, but is not,, Connecting to the engines side above the blower (super charger).
    Here at this vertical cable end is a pull to release (spring loaded) cam that closes an internal flapper (closing air off from the engine).
    Should be a lil lever that you can push with your thumb. With the shutdown cable (in the wheel house), push on this lil lever till you feel or hear a click. It should now be locked open.

    There may be a horizontal cable above all this, this is your throttle. Don't mess with it.

    If you can not still find it, Take pictures and post them of both ends of the blower.
    We will figure it out for you.
  4. NYCAP123

    NYCAP123 Senior Member

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    Here's a YouTube video:
  5. Milka

    Milka New Member

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    My photos seem to be to big but I found "Detroit Diesel", "GM" and "5167294" and those numbers have an "M" under it
  6. Milka

    Milka New Member

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  7. Milka

    Milka New Member

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    Sent photos to a mechanic and he said its a

    6-71 N 230hp
  8. Capt Ralph

    Capt Ralph Senior Member

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    I looked over pictures sent.
    It is an original 6-71 without blower shut down flapper.
    I'll resize the pictures and post below in a few minutes.

    Any long set of numbers that start with 51 is a later part number.
    5167294 is the water manifold part number.

    That is the later head, water manifold, valve cover and exhaust manifold.
    I can not tell if that is the 2 or 4 valve head.

    Further, I do not see any shut down system attached to the governor top either.

    Original GM/Allison M clutch.

    Sweet ole girl needs a new dress.
    I'd say most of that rust is from condensation. When was the last time she ran and under load?

    Keel cooled? Raw water pump just goes to a later exhaust dump can.

    With the un-original idle set screw, I would say throttle all back kills the engine.
    Open the throttle some and try to start her.
    Last edited: May 8, 2020
  9. Capt Ralph

    Capt Ralph Senior Member

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    Here they come;

    20200507_221304a.jpg 20200507_221312a.jpg 20200507_221335a.jpg 20200507_221410a.jpg
  10. Capt Ralph

    Capt Ralph Senior Member

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    20200507_221418a.jpg 20200507_221506a.jpg 20200507_221518a.jpg 20200507_221524a.jpg
  11. Capt Ralph

    Capt Ralph Senior Member

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    20200507_221554a.jpg 20200508_073017a.jpg 20200508_073023a.jpg 20200508_073101a.jpg 20200508_073120a.jpg
  12. Capt Ralph

    Capt Ralph Senior Member

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    That MDJE and water heater in the back ground could make for great reef material.
    Could that gen-set still run?
  13. Milka

    Milka New Member

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    Generator and water heater i believe are shot beyond repair

    I was told alot of things about this boat and many hings I don't think were correct... heard 5 years by people but previous owner said she ran 2 years ago
  14. Capt Ralph

    Capt Ralph Senior Member

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    Where you at?
    Closest big town / airport?
    If it's a Detroit and spins over, we can make her run.
    No promises how well.....
  15. Milka

    Milka New Member

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    She sits in Willoughby Marina Norfolk Virginia. This big girl

    Attached Files:

  16. Capt Ralph

    Capt Ralph Senior Member

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    Frack, It had to be Norfolk.

    Try my first idea (open throttle and crank to start) first. If no joy give me a ring.
  17. rtrafford

    rtrafford Senior Member

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    Ralph,
    not familiar enough with this series, but what's this right here? Appears to resemble a cog?

    20200507_221335a.jpg
  18. Capt Fred

    Capt Fred Senior Member

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    upload_2020-5-9_7-5-1.png Observe the starter motor duty cycle.
  19. Capt Ralph

    Capt Ralph Senior Member

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    Yep, That is the governor kill lever, Nothing attached to it. When pulled on, it over rides the governor and pulls the racks to no-fuel and the engine dies.
    It also has a nice spring action to return to the run position.
  20. rtrafford

    rtrafford Senior Member

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    Right, but doesn't it appear to be disengaged/killed? Doesn't appear locked and loaded....