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Detroit 671 TI rebuild

Discussion in 'Ocean Yacht' started by Boomer, Jun 26, 2018.

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  1. boatpoor, Dec 22, 2018
    #121
    boatpoor

    boatpoor Active Member

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    I'm confused about the rocker bridge pin failure. Can somebody explain what happened here? I've heard of bolts backing out of one side ( never torqued)and overloading the other side and causing it to break out of the head but not pin failure on a Detroit.
  2. Ormond Bert54, Dec 22, 2018
    #122
    Ormond Bert54

    Ormond Bert54 Senior Member

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    Rocker Bridge Pin Leak 12V71TI.jpg Here is a photo of the bridge pin leaking once the system was pressurized. Unfortunately, the bridge pins are press fit when the cylinder heads are manufactured and under the bridge pins is a coolant passage. Just another one of many ways to have a $50k event.
  3. Capt Ralph, Dec 22, 2018
    #123
    Capt Ralph

    Capt Ralph Senior Member

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    Excellent picture and explanation.
  4. boatpoor, Dec 22, 2018
    #124
    boatpoor

    boatpoor Active Member

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    Sounds like somebody tried to loosen the lock nut on the adjusting screw with the bridge in place. Never a good idea! They're not designed to withstand any side load.
  5. Capt Ralph, Dec 23, 2018
    #125
    Capt Ralph

    Capt Ralph Senior Member

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    Boomer
    We ready to fish yet??
    It's cold up here. Ready to come down to warmer climes and go fishing.
    You have to take out fishing a bunch of supporters who have shed tears (not checks) with you.
    I'll wait for the second trip.... :D:D

    Luv ya guy.
    Safe and Merry Christmas.
  6. K1W1, Dec 24, 2018
    #126
    K1W1

    K1W1 Senior Member

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    If its a push fit can you not get a larger diameter pin made and push it in or get one made with a thread in the end and cut a matching one in the hole, you could even add a lock nut if you were worried about it coming loose.
  7. Capt Ralph, Dec 24, 2018
    #127
    Capt Ralph

    Capt Ralph Senior Member

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    The fix is a threaded pin into the head cast.
    K1W1 likes this.
  8. Boomer, Dec 28, 2018
    #128
    Boomer

    Boomer Senior Member

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    Check!!! Waiting to feel comfortable first then we can arrange something! Did a test run Christmas day and all seemed well...will put some more time on it maybe this weekend to continue break in..btw, hope you had a merry Christmas yourself and a happy new year.
    Last edited: Dec 28, 2018
  9. Boomer, Dec 28, 2018
    #129
    Boomer

    Boomer Senior Member

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    Yup...on all the bulletins now
  10. Boomer, Dec 28, 2018
    #130
    Boomer

    Boomer Senior Member

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    Bridge pin leak explanation was excellent...now i get what happened!
  11. Capt Ralph, Dec 28, 2018
    #131
    Capt Ralph

    Capt Ralph Senior Member

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    So what was the final fix? New head or repaired in place?
  12. Boomer, Dec 28, 2018
    #132
    Boomer

    Boomer Senior Member

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    Repaired in place...drilled out the pins and put threaded in
  13. Capt Ralph, Dec 28, 2018
    #133
    Capt Ralph

    Capt Ralph Senior Member

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    Warranty or did you B.O.A.T. ??
  14. Boomer, Dec 28, 2018
    #134
    Boomer

    Boomer Senior Member

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    Boat
  15. Capt Ralph, Dec 28, 2018
    #135
    Capt Ralph

    Capt Ralph Senior Member

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    Sorry to read that.
  16. Boomer, Apr 1, 2019
    #136
    Boomer

    Boomer Senior Member

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    Well...we had our 3rd in a row successful trip with the boat now...no motor problems...knock on wood...let the summer come!
  17. Capt Ralph, Apr 1, 2019
    #137
    Capt Ralph

    Capt Ralph Senior Member

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    Out standing...:)
  18. chesapeake46, Apr 1, 2019
    #138
    chesapeake46

    chesapeake46 Senior Member

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    Great news. Starting the summer off right !!
  19. Boomer, Apr 1, 2019
    #139
    Boomer

    Boomer Senior Member

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    Knock on wood so far!
  20. Capt Ralph, Apr 1, 2019
    #140
    Capt Ralph

    Capt Ralph Senior Member

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    So, You have a lot of fishing schedules to confirm. When you taking us out?
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