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Detroit 671 TI rebuild

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

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  1. Boomer, Jun 26, 2018
    #1
    Boomer

    Boomer Senior Member

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    Pricing out the rebuild on my broken valve motor. One mechanic mentioned needing a special head for that motor with special valves so it doesn't come apart again...anyone heard of this? Also, when the valve broke, does it wipe out the exhaust side of the turbo?
  2. Capt Ralph, Jun 26, 2018
    #2
    Capt Ralph

    Capt Ralph Senior Member

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    Say what?? Walk away from him.

    Those valve parts have to fly somewhere. Usually down wind,,, to the turbo..


    NOBODY is going to give you a quote until the head, piston, liners and turbo are inspected.
    It takes billable hours to get that far.

    We only offer estimates pending inspections. We never quote. Nobody can.

    You need to find a reputable DD shop and let them have it.

    Then smile when your signing the checkbook.
  3. MBevins, Jun 26, 2018
    #3
    MBevins

    MBevins Senior Member

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    What he said!
  4. Boomer, Jun 26, 2018
    #4
    Boomer

    Boomer Senior Member

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    Thank you...got another estimate for 12k plus the possibility of the head not being able to be used for a core and turbo wiped out..j6 valves included...also extra is raising the motor if pan can't be dropped...
  5. MBevins, Jun 26, 2018
    #5
    MBevins

    MBevins Senior Member

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    Could be just me but that seems to low.
    And I highly doubt that they can get under that motor without raising it.
  6. Capt J, Jun 26, 2018
    #6
    Capt J

    Capt J Senior Member

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    It seems low to me as well. If you're going to major a 671 TI, you do it all.....clean all of the coolers, rebuild the turbo, rebuilt injectors and on and on and on......
  7. Pascal, Jun 28, 2018
    #7
    Pascal

    Pascal Senior Member

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    It s a bit low but it depends on what s included or not. Raising the engine will add a couple of days of work, if not more...

    The key isn't just the price but the quality and reputation of the mechanic.
  8. RT46, Jun 28, 2018
    #8
    RT46

    RT46 Senior Member

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    12K sounds like a good starting point.
  9. PacBlue, Jun 29, 2018
    #9
    PacBlue

    PacBlue Senior Member

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    $2,000 per cylinder - seems low for a complete rebuild. Try and get a good understanding of what the mechanic considers a complete rebuild in writing, then make sure to include all the other components mentioned above to do the job right. Is it an A thru Z approach or are they only taking you to 'S' and then will walk you up as it becomes apparent that you need to do a "complete" overhaul?

    Injectors - use a service that can flow test them on a bench. You will find that quality varies and you may need to physically go through more than 6 to get 6 good ones.
  10. Capt Ralph, Jun 29, 2018
    #10
    Capt Ralph

    Capt Ralph Senior Member

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    Chances are you just need a tip on one injector.
    Find an old school shop that will fix, pop and match what you have.
    I have a shop in Jax, His brother is in Orlando if you cant find a shop on the left side of the state.
  11. Boomer, Jun 29, 2018
    #11
    Boomer

    Boomer Senior Member

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    Thank you everyone...just had new injectors installed 50 hours ago
  12. Boomer, Jul 18, 2018
    #12
    Boomer

    Boomer Senior Member

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    7759.jpeg
  13. Boomer, Jul 18, 2018
    #13
    Boomer

    Boomer Senior Member

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    Yup...its broken...
  14. Capt J, Jul 18, 2018
    #14
    Capt J

    Capt J Senior Member

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    Looks like you dropped a valve and it bounced around on the piston for a while.
  15. MBevins, Jul 18, 2018
    #15
    MBevins

    MBevins Senior Member

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    Remember what I said in the other thread. You need to pull the head on the other engine and have the valves properly inspected. Hell, once the head is off just have it rebuilt and be safe.
    I'm speaking from first hand experience.
  16. Capt Ralph, Jul 18, 2018
    #16
    Capt Ralph

    Capt Ralph Senior Member

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    That's one injector that needs rework. Find a shop that can fix injectors and have all pop'd to match.

    Later 71 heads (4 valve) really need to be looked over very well. For me, I'd get a new head.
    Maybe a new rod with the piston/liner kit.

    New chunk for the turbo also.

    How does the other lungs look?
    I don't see any cross hatch pattern on this liner.

    I recall you commented the engine lost a great deal of oil.
    Large amounts of oil is shot up under to piston to help cool it. In your case, sucked rite thru that hole and out the exhaust.
  17. Boomer, Jul 19, 2018
    #17
    Boomer

    Boomer Senior Member

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    Will redo the other head this winter to be safe
  18. Boomer, Jul 19, 2018
    #18
    Boomer

    Boomer Senior Member

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    That is the winter plan
  19. Boomer, Jul 19, 2018
    #19
    Boomer

    Boomer Senior Member

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    Going to do a top end rebuild with liners
  20. Capt J, Jul 19, 2018
    #20
    Capt J

    Capt J Senior Member

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    If you're going to drop the pan to do liners, you might as well do everything. You're taking the rods off anyways to pull the pistons out, might as well do main bearings and the oil pump while you're there, that's about all that's left.
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