Starboard Engine Losing Power

Discussion in 'Diesel Engines/Drives/Transmissions/Props' started by Boat Drinks, Jul 10, 2016.

  1. Boat Drinks

    Boat Drinks Member

    Jun 21, 2008
    Waterford, WI
    1999 400 Sundancer
    T CAT 3116
    We were coming back to the marina today, after about 30 mins. running at about 2600 rpms my starboard engine starting losing power and RPMs. I backed both engines to about 2000 RPM's then throttled back up and the starboard engine got to about 2500 RPM's and after a couple mins it started slowing down again. I had the same process all the way back to the marina. The engines are CAT 3116 1999 with 800 hours. Temps and pressure were all fine, air filter looks clean and fuel filters were changed last Aug. Any advise would be appreciated.


  2. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    Fuel filters again. Tanks may have some contamination. What additives if any do you use? What fuel do you buy? Sounds like classic fuel starvation.
  3. Robski97

    Robski97 Well-Known Member

    Jan 15, 2007
    North Bellmore, NY
    Cummins QSC 8.3's
    Agreed , Fuel issue .

  4. DjDaoust

    DjDaoust Member

    Nov 4, 2015
    La Crosse, WI
    1998 450 Sundancer - 3 Boys & A Blonde
    Cat 3126's
    Turbo's spinning up? Any smoke? Injector possibly going?
  5. Sonnyboi400

    Sonnyboi400 New Member

    Aug 10, 2015
    1996 searay sedan bridge
    3116 cat
    I have the same engine with the same problem. My engine would smoke real bad when it happen.

    SUNDOWNER New Member

    Oct 30, 2016
    1999 Sea Ray 37 EC custom tower with cat diesels
    Twin cat 3116 TA
    I have a 99 with 3126 cats with similar issue. You have Fuel starvation. Just went thru whole process. Took Fuel sample. Catcsaid engine fine. Then engine inspection and sea trial with mechanic who said turbo ok and fuel problem. Had access ports to tanks installed, tanks scrubbed and Fuel polished $1900! And still getting issues. Changed racor elements 45 miles offshore twice
    I then totally disassembled racor son the dock. Called racor. There is an aluminum ball and gasket hidden in the racor. There is dirt in it that prevents efficient fuel flow into the chamber. So must be cleaned out. Check your record and carry plenty of primary and racor filters?! SUNDOWNER. Margate NJ
  7. 370Dancer

    370Dancer Active Member

    Oct 2, 2006
    Florida - Alabama
    1998 370 Sundancer
    380hp MAG MPI Gen VI with V drives
    This is priceless information. Guessing it's an anti-siphon thing. Never knew. Go get a beer.

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