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2008 - 29 foot Sea Ray twin 305s loafing

Discussion in 'The Okie Corral' started by .264 magnum, Mar 6, 2012.

  1. .264 magnum

    .264 magnum CLM

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    A buddy's boat:
    2008
    305 CID x2
    2 screws or 2 stern drives - don't know but think stern drives


    Problem:
    Boat used to cruise at 33/34 mph indicated ( that's why I assume it's equipped with stern drives). Now it won't plane-out. Top speed is about 19 mph indicated.

    Thoughts/some combination of:
    1. Bad/old fuel
    2. Fouled plugs
    3. Bad/clogged fuel filters
    4. Bad/lame fuel pumps

    We are taking the thing out on a cruise tomorrow....

    Any other ideas?


    ETA - gasoline not diesel
     
    Last edited: Mar 6, 2012
  2. USMCsilver

    USMCsilver Boat Life ©

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    Flooded bilge? Too much weight...? Might be another thing to consider.

    Check compression if possible.
     

  3. tarpleyg

    tarpleyg

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    I don't recall the hull design of those 28-28' Sea Rays so I'm not sure about this but in addition to the items you listed, look for water in the hull in places you cannot see. This is the #1 cause of the performance you indicated if the motors are otherwise running properly. Also, check for a damaged prop(s). He should be using Marine Sta-Bil or Startron in all the fuel he puts in that boat. Ethanol, left untreated, will wreak havoc on marine file systems.

    Greg
     
  4. AK_Stick

    AK_Stick AAAMAD

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    How are the motors running? Are the motors running well? Or are they sluggish as well?


    Could be lots of things, need more info.
     
  5. porschedog

    porschedog

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    That's probably not an engine issue

    Have him see if there's a lot of growth on the hull itself
     
  6. VC-Racing

    VC-Racing General Flunky

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    Could be bad prop in one drive ...

    Outdoor Hub mobile, the outdoor information engine
     
  7. USMCsilver

    USMCsilver Boat Life ©

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    I believe that would cause it to pull more one way or the other. :wavey:
     
  8. .264 magnum

    .264 magnum CLM

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    1. Compression test is the next step beyond the normal stuff.
    2. A friend bought it as is today. He assured me the bilge pumps work and the boat is not flooded or listing.
    3. It's got list plates of whatever at the stern as well - apparently those things work fine.
    4. My friend assured me he knows how to work the trim. I have less confidence.
     
  9. .264 magnum

    .264 magnum CLM

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    Noted thank you
     
  10. .264 magnum

    .264 magnum CLM

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    That's my problem. I haven't seen the boat yet - will board at 6:00AM tomorrow.

    I'll take my phone and ask for GT help as needed.
     
  11. .264 magnum

    .264 magnum CLM

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    Great thought, however, apparently, the boat was lifted, cleaned and bottom painted about five weeks ago.
     
  12. USMCsilver

    USMCsilver Boat Life ©

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    Trim tabs need to be all they way up when getting on plane, they can be used accordingly after the boat's up.

    As far as the bilge/water goes -- there may be as many as three pumps on board a boat that size. A petcock could be turned that may not allow water to escape. I've seen this happen before, so, it's a quick fix that's often overlooked.

    Good luck!
     
  13. VC-Racing

    VC-Racing General Flunky

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    Not sure. I know we had a issue on a ski boat. It would run at slow speed but under full power it would stall. Found out the prop clutch was bad.

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  14. Deanster

    Deanster Cheese? CLM Millennium Member

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    hmmmm... I'd go with (in order) old gas that's lost a lot of its volatiles and isn't giving enough power, lots of water in the bilge or intrusion into the hull, adding a bunch of weight (very very bad), or possibly spun hubs on the props - there's a rubber shock absorber in the hub of most i/o props, and once you've hit something with the prop, it will often slip quite a bit. Depending on how long/hard he tried to get it on plane, and the props, etc., it's certainly possible, but not a top candidate.

    The big question is how well the engines are running. Are they at RPM, but straining under the load, or are they struggling to maintain RPM? Nice clean exhaust, or grimy, smoky, oily crud? Does the boat feel like it's light in the water, or wallowing like a pig? Good acceleration? All this will tell you a lot, though it's tough on a boat you've never touched before, unless you've spent time on a lot of different boats and have a good idea what to expect.

    First test is to see if it runs better of fresh gas from a 'pumped today' source, if there's not an obvious problem on visual inspection.
     
    Last edited: Mar 6, 2012
  15. Anon1

    Anon1

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    While you're thinking about the fuel/fuel system, remember that it probably has a water separator that might need to be emptied. It will look like an in-line oil filter only on the fuel line, likely at the front left of a Mercruiser engine.
     
  16. .264 magnum

    .264 magnum CLM

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    Good call. Will check ASAP.
     
  17. .264 magnum

    .264 magnum CLM

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    Roger that - will fill in the GT collective after AM cruise.
     
  18. faawrenchbndr

    faawrenchbndr CLM

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    Threads like this remind me why I sold my boat.

    Good luck,......no thoughts other than what has been discussed above.

    BUST
    OUT
    ANOTHER
    THOUSAND
     
    Last edited: Mar 6, 2012
  19. Luvdux

    Luvdux

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    Is it in the water all the time? If so check the bottom. My bet is some growth. Barnicals or what not. It will make it sound like an engine problem even though nothing is wrong with the engines. It will lead to engine problems if you run it like that for a long time.
     
  20. .264 magnum

    .264 magnum CLM

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    As best I know right now it was lifted, cleaned and bottom painted a few weeks ago.