Engine issue on New to me 2005 Searay 260

Discussion in 'Newbie Lounge - NEW' started by Mark260DA, Oct 9, 2017.

  1. Mark260DA

    Mark260DA New Member

    3
    Sep 19, 2017
    Panama City Florida
    Just purchasing a 2005 SeaRay 260DA, already own a 1972 Thunderbird Formula 233
    350 Mercruiser Bravo III
    Hi everyone I am new here but not new to boating. A little back ground I am 54 live in Panama City, Florida and have been boating since 1980. My other boat is a 1972 Thunderbird Formula 233 I spent 2 years restoring and know every inch of her and can do all the mechanics on those old Mercruiser Pre Alpha drives and old Chevy in line 6 cylinder engines. Because one boat wasn't enough we just bought a 2005 SeaRay 260 Sundancer and starting to really enjoy the cruising lifestyle with the wife and 2 kids.

    Ok enough background and if I haven't lost you my problem happened today. Took the boat out and no issues. Planed it out and rode around for about 20 minutes, slowed to trolling speed and cruised around the bay at about 6 mph for an hour when I noticed engine idle went down to 500rpm and would not go any faster. No alarms sounding just engine would not go over that rpm. Took it out of gear and same thing and then it quit entirely.

    Put the anchor out and tried starting it and the engine would turn over and for a spilt second sounded like it wanted to fire up but then nothing. While turning over the engine I started checking gauges and noted I had oil pressure, water temp at around 160 and before anyone asks yes I have fuel just over a half a tank . Then I noticed the Smart gauge showing zero psi on water pressure.

    All this stuff is new to me and this is the newest boat I have ever owned so still trying to get used to this engine. It has a Mercruiser 350 Mag 300hp tied to a Bravo 3 out drive. It is raw water cooled. I checked the out drive and it wasn't blocked with a plastic bag or grass. I continued trying to start it for about 15 minutes on and off and it finally started and ran. Engine would go over 500rpms now but still showing zero water pressure. I am assuming this is the raw water being pushed up to the engine. Engine water temp still at around 160*. Opened up the hatch and felt engine which was warmed up but certainly not scolding hot so it seemed like it was running at that temp. Ran it back to marina at 1000rpm with hatch open for air flow and watched gauges with no change to water temp, 160* and water pressure zero. Once at the marina had them put boat on the rack and ran engine on the hose. Same result engine temp at around 145* and water coming out where it should but still zero water pressure on the gauges. So any guesses and sorry for such a long story.
     
  2. KevinC

    KevinC Member

    338
    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    1988 Proline Center Console - 90hp Mariner/Mercury
    1969 Boston Whaler
    Twin 8.1 V-drives
    Since the engine stayed at around 160 then I would think you had some water flow. Without it temps would rise much higher real fast. My first inclination would be that it was a bad/disconnected water pressure sensor that was showing no pressure and the engine went to a guardian mode to protect it.

    -Kevin
     
  3. Mark260DA

    Mark260DA New Member

    3
    Sep 19, 2017
    Panama City Florida
    Just purchasing a 2005 SeaRay 260DA, already own a 1972 Thunderbird Formula 233
    350 Mercruiser Bravo III
    Kevin, thanks for the response. I don't have any experience with this engine and computers, sensors but I was thinking the same. I just hate spending money on having someone else figure out what the problem is but I may have to in the end until I get a little experience with this boat and engine.
     
  4. GCHOG

    GCHOG Member GOLD Sponsor

    41
    Mar 25, 2016
    Bass River, Viking Marina, South Jersey
    2006 Sea Ray 260 Sundancer
    6.2 Bravo III
    Hi Mark, + 1 on what KevinC says. I had a very similar issue this spring. ( I have a similar boat as you, '06 260 w/ 6.2 ), turned out to be water pressure sensor. Very easy fix, 10 minutes. Sensor is at behind the engine, on top of power steering cooler, the only sensor in that area , so you should find it easily. Quicksilver part# is 8M6000623, about $138.00 locally for me. Like most folks, I hate just throwing $ at unsure problems, however , it sounds like that's your issue. Hope this helps. oh. ps, make sure there is no corrosion on the connector to the sensor.
     
  5. paulswagelock

    paulswagelock Member

    964
    Oct 25, 2010
    pa
    2008 270 SLX 496 mag bravo 3
    8.1 496 / bravo III
    With an adapter and a pressure gauge you could verify the pressure before purchasing the sensor. But if you need to purchase those things, maybe just bite the bullet and buy the sensor. There is a run of bad ones out there and your year is likely in the range.
     
  6. Mark260DA

    Mark260DA New Member

    3
    Sep 19, 2017
    Panama City Florida
    Just purchasing a 2005 SeaRay 260DA, already own a 1972 Thunderbird Formula 233
    350 Mercruiser Bravo III
    GCHOG, thanks for the response and that sounds like a likely cause. Once I get off I will check that out.

    paulswagelock, I wish I had the adapter and gauge and may just go buy it because you can never have enough tools
     
  7. paulswagelock

    paulswagelock Member

    964
    Oct 25, 2010
    pa
    2008 270 SLX 496 mag bravo 3
    8.1 496 / bravo III
    Amazon prime sensor is $25. Claims OEM...
     
  8. skibum

    skibum Well-Known Member

    Jul 30, 2007
    Perry Hall, MD
    2005 Sundancer 260
    496 Magnum HO
    I installed a mechanical water pressure gauge on mine using a brass T that I bought at Home Depot. I got the gauge at a pool supply store (H2O pressure is less than 20 psi, so you don't want one that reads too high or you won't be able to read it. I think my gauge goes to 30 psi max). Total cost was less than $20. The original H2O sensor is on the other half of the T.

    It sounds like you are in Guardian mode, but you should be getting an alarm and a error on your Smartcraft gauge to go with the reduced power. My drive had "bravoitis", but I always had at least 2 psi showing on the SC gauge so I doubt that yours does. If the mechanical gauge shows no pressure, post back and we'll talk you through checking for it. Its easy to look for. You need to remove the 2 bolts holding the water inlet housing to the transom assembly and visually inspect the hose underneath of it. I think Garry and Kevin are correct and your sensor is bad.
     

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