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Mercury 5.0

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  • Mercury 5.0

    Looking to get a used boat that has an I/O mercury 5.0 . I'm not sure how many hours are on the engine. Its a 2006. What should I be on the look out for? What questions to ask the current owner? Thanks

  • #2


    That is a pretty broad question. Is there a concern about the engine? Tell us more about the boat.

    The things to inspect are pretty much the same for any I/O engine.

    Outdrive - corrosion
    Bellows - cracking/holes
    Gear Oil - clean or milky, water present?
    Engine (they are GM engines) so the 5.0 is the GM 305 V8
    Exhaust manifold and elbow gasket area - are there signs of leakage around the gasket
    Any leaks while running
    Sea/lake test - does the engine reach it's spec'd RPM at WOT and does the boat go the speed that it should
    Compression test - are all of the cylinders within an acceptable range.
    Oil condition - before/after running on the lake/sea trial - clean, dark, . . . milky?
    Carburetor or Fuel injected? MPI or EFI?
    Engine temperature
    Oil pressure
    Does the engine have 'open' cooling or 'closed' cooling (Heat Exchanger)
    Exhaust system leakage?

    Then there is a whole bunch of stuff for the boat. There are checklists that you can reference in the 'stickies' at the top of the forums.
    Best regards, Ted . . . . Cape Cod, MA

    Formula 330 Sun Sport, O'Day Mariner Sail #3224, Sunfish
    Past Boats: Catalina 22 Sail #10531, Formula 242 Sun Sport
    Twin Mercruiser 7.4 LX MPI (0F802036, 039), Bravo 3's (0F806198, 199), Mercury 7.5 HP (1969), Johnson 4.5 HP (1980)

    My Boating Web Pages: http://www.tpenfield.com

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    • #3
      here is the link in the sticky http://forums.iboats.com/forum/gener...er-s-checklist

      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - http://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari

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      • #4
        I've bought two boats in the past and both had rotten transoms that needed to be replaced, felt kinda dumb the second time. Definitely check that and the floors etc.
        1978 Grew 194 with Merc 165 inline6 pre alpha

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        • #5
          Thanks. I'll read through the stickies. I don't really have any concerns other than this in my first I/O boat. I've been reading as much as I can and the boat overall looks to be in good condition just needs some cleaning.

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          • #6
            Sign up today
            Well, carpet can hide a multitude of sins

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