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2006 Tiara 42 Open with QSM 11 675 hp engines

Discussion in 'Tiara Yacht' started by DoctorM, Oct 18, 2025 at 3:57 PM.

  1. DoctorM, Oct 18, 2025 at 3:57 PM
    #1
    DoctorM

    DoctorM New Member

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    Oct 12, 2025
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    28412
    Hi All,

    I'm looking at a Tiara 42 Open with 1600 hrs on Cummings QSM 11 675 hp engines. Boat looks pristine, all service records available.

    Any one out there have experience with this set-up ?

    Greatly appreciate your advice & thoughts !

    DrM
  2. ranger58sb, Oct 19, 2025 at 7:49 AM
    #2
    ranger58sb

    ranger58sb Senior member

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    Chesapeake Bay, USA
    No clue about the boat, but if you don't know already reading suggests you should look over Tony Athen's/Seaboard Marine recommendations on how to best manage QSMs.

    (Mods: if that's overstepping, delete away...)

    -Chris
  3. DoctorM, Oct 19, 2025 at 8:17 AM
    #3
    DoctorM

    DoctorM New Member

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    Thanks Chris - pulled Tony's post on the QSMs already. Wealth of information on how to prop those engines, if I make the move on the boat I'll be asking the current owner about it ...

    DrM
  4. Maxwell, Oct 19, 2025 at 12:02 PM
    #4
    Maxwell

    Maxwell Senior Member

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    I owned a 42 however had Cat C12's. The Cummins motors are a little smaller which will improve accessibility in a tight engine compartment. Overall the boat is pretty well thought out and above average quality for the price. They are solid glass below the water line, however be sure to take a moisture meter/IR Cam to the hull sides as the engine compartment plenum drains have been a known area of water intrusion into the balsa core.
  5. DoctorM, Oct 19, 2025 at 12:12 PM
    #5
    DoctorM

    DoctorM New Member

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    Hi Maxwell - That is super helpful information from someone who owned one ! I'm too old now (72) to contort myself in an engine room for routine maintenance issues so I'll hire someone who can. Will absolutely take appropriate measurements in the engine compartment.

    Many thanks Capt,
    DrM