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Detroit 671 TI rebuild

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

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  1. Boomer

    Boomer Senior Member

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    Interesting...tubes were replaced but not sure if tubes injectors sit in were replaced...guess it doesn't matter now as a new head will resolve that problem?
  2. Capt Ralph

    Capt Ralph Senior Member

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    New head will not come with injector fuel tubes. Double check with your tech.
    I personally on my boat have resused fuel tubes a second time, i have had some leakers. That's why my customets always get new fuel tubes and probably the only ddc part we always have on hand.
  3. cleanslate

    cleanslate Senior Member

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    Boomer!...My mechanic replace the injectors last year on my 471 Ti port side engine and soon after I noticed my oil slowly rising up on the dip stick, along with the thin oil feeling. Turned out to be just one of the tubes Capt Ralph was talking about was leaking. He replaced with a new one and all is fine 200 hours later.
    Good luck with entire rebuild or builds...
  4. Boomer

    Boomer Senior Member

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    Thank you everyone...
  5. NJDJ

    NJDJ New Member

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    good thread. Enjoy following
  6. Boomer

    Boomer Senior Member

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    We have progress...finally....raising motor tomorrow to pull screen and get piston and liner pulled....a big thanks for all the support and encouragement...a big thank you to Capt. Ralph for the efforts you put forth to try and assist me...thank you again.. I would have given up by now if not for the encouragement of this group
  7. Boomer

    Boomer Senior Member

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    Btw..final decision on what caused valve to drop...the retainer on the top of valve that keeps it from dropping apparently gave up and let go....thus the valve dropped in....10 cent part
  8. chesapeake46

    chesapeake46 Senior Member

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    Good luck with the rebuild. Keep posting updates.
  9. Boomer

    Boomer Senior Member

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    Latest update...motor did not have to be raised...he was able to look push pan to the side to get under motor...crank was good..replacing the bearings, liners, pistons, etc....sadly they found some Mickey mouse work done inside the pan with the oil pump etc...from who ever did the last rebuild...all being corrected...approx 10 more days to start up....
  10. cleanslate

    cleanslate Senior Member

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    Boomer! Are your engines J&T or Covington DDs? Just wondering.
  11. Boomer

    Boomer Senior Member

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    JT 671 TI
  12. cleanslate

    cleanslate Senior Member

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    Ok...was looking at an Ocean 46' 1985 with 671 covingtons this weekend.
  13. cleanslate

    cleanslate Senior Member

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    Sound like you are making progress. Good job!
  14. Boomer

    Boomer Senior Member

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    Hard to believe a 10 cent part would cause all these issues...even engine survey wouldn't pick that up
  15. cleanslate

    cleanslate Senior Member

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    Ugh... that stinks! The Ole Valve bomb. Ka-boomer-boom. :(
  16. Boomer

    Boomer Senior Member

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    Boomer...lol
  17. Boomer

    Boomer Senior Member

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    Progress... 11308.jpeg
  18. Boomer

    Boomer Senior Member

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    11311.jpeg
  19. cleanslate

    cleanslate Senior Member

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    Wow! Great news , is that you doing the work?
  20. Capt Ralph

    Capt Ralph Senior Member

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    Gad I miss working on straight 6s. That's what I started on when I was a kid.
    The bottom end of a 671 is a brute.
    I still don't think there is a crankshaft of any mfg that can take so much abuse and stay in fine shape. Sadly, The valves and pistons don't when the H P is poured on.
    Their still my fave.