What is normal water pressure and temp?

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Mightychan, Aug 11, 2017.

  1. Mightychan

    Mightychan New Member

    Oct 8, 2016
    Panama City FL
    350 MPI w V Drives
    Hi all, my boat (new to me this season) has twin FWC 350 MPIs with V drives. I just had both raw water pumps and impellers replaced. At 3800 RPM, my port engine shows 23 PSI and 177 degrees, while starboard shows 31 PSI and 170 degrees. I am surprised to see this large of a variation in water pressure with new pumps. What should I be looking at?
    It's worth noting that at full throttle, about 4500 RPM, the port engine climbed to 179 degrees before I backed down. At what temp do the engine alarms go off?
    Thanks, all!
  2. Boater420

    Boater420 Member

    Mar 11, 2015
    Clearwater, FL
    '97 330 Sundancer
    Westerbeke 4.5BCG
    Twin Merc 454's
    Perhaps the thermostats are in need of replacement, heat exchanger clogged if you're fresh water cooled.
  3. Mightychan

    Mightychan New Member

    Oct 8, 2016
    Panama City FL
    350 MPI w V Drives
    Heat exchanger is clean.
  4. cfd95

    cfd95 Member

    Nov 5, 2013
    Northport Long Island
    2002 310 Sundancer
    350 Horizons
    V Drives
    Transmission cooler clogged (impeller parts)
    Just because the heat exchanger is clean doesn't mean its still good.
    Over the years the cooling tubes get covered and lose their cooling efficiency
    to transfer heat.
    It's only recommended that they be boiled out once then replaced.
  5. Bt Doctur

    Bt Doctur Active Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    inlet screens painted or scaling, riser/elbow clogging up a bit
    Concentrate on watching the gauges and remove the water pressure gauge.FWC motors do tend to be closer to the 165-175 range with a 165 stat
  6. importmonkey

    importmonkey Member SILVER Sponsor

    Jul 9, 2015
    Middle River, MD
    2007 44 Sundancer
    QSC 500s
    Temps and water pressure both seem high. High pressure I dictates blockage for whatever reason. I would guess you want to be below 20psi and around 160degF.

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