Click for Ocean Alexander Click for Westport Click for United Click for Cheoy Lee Click for Llebroc

Detroit 671 TI rebuild

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

You need to be registered and signed in to view this content.
  1. boatpoor

    boatpoor Member

    Joined:
    May 4, 2016
    Messages:
    65
    Location:
    32407
    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

    Ormond Bert54 Senior Member

    Joined:
    Mar 29, 2009
    Messages:
    461
    Location:
    Ormond Beach, FL
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    Excellent picture and explanation.
  4. boatpoor

    boatpoor Member

    Joined:
    May 4, 2016
    Messages:
    65
    Location:
    32407
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    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

    K1W1 Senior Member

    Joined:
    Sep 30, 2005
    Messages:
    7,390
    Location:
    My Office
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    The fix is a threaded pin into the head cast.
    K1W1 likes this.
  8. Boomer

    Boomer Senior Member

    Joined:
    Oct 14, 2017
    Messages:
    533
    Location:
    Seminole
    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

    Boomer Senior Member

    Joined:
    Oct 14, 2017
    Messages:
    533
    Location:
    Seminole
    Yup...on all the bulletins now
  10. Boomer

    Boomer Senior Member

    Joined:
    Oct 14, 2017
    Messages:
    533
    Location:
    Seminole
    Bridge pin leak explanation was excellent...now i get what happened!
  11. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    So what was the final fix? New head or repaired in place?
  12. Boomer

    Boomer Senior Member

    Joined:
    Oct 14, 2017
    Messages:
    533
    Location:
    Seminole
    Repaired in place...drilled out the pins and put threaded in
  13. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    Warranty or did you B.O.A.T. ??
  14. Boomer

    Boomer Senior Member

    Joined:
    Oct 14, 2017
    Messages:
    533
    Location:
    Seminole
    Boat
  15. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    Sorry to read that.
  16. Boomer

    Boomer Senior Member

    Joined:
    Oct 14, 2017
    Messages:
    533
    Location:
    Seminole
    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

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    Out standing...:)
  18. chesapeake46

    chesapeake46 Senior Member

    Joined:
    Jul 26, 2009
    Messages:
    1,372
    Location:
    Chesapeake Bay, Delaware Bay & S.Jersey
    Great news. Starting the summer off right !!
  19. Boomer

    Boomer Senior Member

    Joined:
    Oct 14, 2017
    Messages:
    533
    Location:
    Seminole
    Knock on wood so far!
  20. Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    8,252
    Location:
    Satsuma, FL
    So, You have a lot of fishing schedules to confirm. When you taking us out?