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Detroit Diesel 1990 12V71TAB

Discussion in 'Engines' started by jmoore, Nov 7, 2026 at 10:40 AM.

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  1. jmoore, Nov 7, 2026 at 10:40 AM
    #1
    jmoore

    jmoore New Member

    Joined:
    Sep 12, 2026
    Messages:
    4
    Location:
    Omaha
    Just purchased a 1990 Viking 63 motor yacht with DD 12V71TAB engines.
    I want to go thru and replace all the raw water hoses and coolant hoses on the engines.
    Can't find information on the various sizes and lengths. Hoping to purchase hose in longer lengths and cut to length on site. Is there a good place to get the information from or supplier that knows the sizes?
    Any recommendations on what type of hose clamps and where to get them would also be appreciated.
    The boat is at remote location and i want to bring everything with me when i travel there.

    Thanks in advance,

    Jack
  2. Capt Ralph, Nov 7, 2026 at 12:54 PM
    #2
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    14,589
    Location:
    Satsuma, FL
    Jack
    Been here, done this.
    I'm on the road using my phone to check YF.
    I use pretty blue silicone hose and correct clamps.
    My DDC shop provided the all of the different size hoses and gaskets.
    You will be draining your coolant to do many hoses.
    When I get back to my desk in the morning, I'll post some pictures and my shops contact info.
    You will need to provide the engine serial numbers.
  3. rtrafford, Nov 7, 2026 at 4:05 PM
    #3
    rtrafford

    rtrafford Senior Member

    Joined:
    Jul 13, 2019
    Messages:
    1,992
    Location:
    Vero Beach

    Agreed. We labeled each and photograph catalogued. We removed each, made one trip, had all new cut to length, new t-bolt clamps, returned and reinstalled. We did the same with oil and gear hoses. Drained all fluids first...
  4. jmoore, Nov 8, 2026 at 7:28 AM
    #4
    jmoore

    jmoore New Member

    Joined:
    Sep 12, 2026
    Messages:
    4
    Location:
    Omaha
    Here ya go

    PORT ENG SER# :12 VA83654 STBD ENG SERIAL#:12 VA83655
  5. Capt Ralph, Nov 8, 2026 at 1:47 PM
    #5
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    14,589
    Location:
    Satsuma, FL
    Oh, I don't need the serials, this shop will ask when you call.
    Try to talk to Steve. He looked all the sizes up in some old manuals and ordered in what he did not have.
    Several days later I picked up a box full of shinny blue hoses and lots of gaskets.
    On my 12V71TIs, this was over 10 years ago.
    On my friends 12V71TAs maybe 5 years ago. This also included 8" exhaust hump hoses.
    My 10+ year old hoses still look shinny and new.

    You can order the correct constant tension, T-bolt or Aba hose clamps for silicone hose, on-line.
    Better clamps are expensive, don't go cheap here.

    Sorry, I could not find any good engine/hose pictures. I'll take some next engine room visit.

    Also, No silicone hoses go on the low (pickup side) of the raw water pump. The suction will cave the hose in.
    I used fiber glass tubing here with short union hoses.
    20250424_151223.jpg

    Tell this shop I sent you.
    https://www.dpssfla.com/contact-us.html
    Last edited: Nov 8, 2026 at 1:57 PM