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    496 SEA WATER PUMP PRESSURE
    #1
    goldeneyee
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    07-22-2010 06:22 AM
    Could anyone with a Mercruiser 496 give me some typical figures as to the water pressure of the sea water pump at idle and say 3600 rpm. Thanks...
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    #2
    35 Lightning
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    08-10-2010 12:58 PM
    on my 540 cu. in. engines they run 15 to 17 psi, when up & running, it seems to be very adequate for cooling, at idle my gauges barely show any pressure, but I have alot of exhaust water at idle, you don't want too much psi or you will start blowing hoses.
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    #3
    Knot 4 Me
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    08-10-2010 01:58 PM
    I want to say low 20's at those RPM.
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    #4
    bajabob 718
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    08-15-2010 10:27 PM
    at idle i get 5 wot 15 and mine in the intake
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    #5
    WATCHUS
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    08-18-2010 09:15 AM
    I get 0 at idle and 15 at runnung mid to high
    Rich
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    #6
    Nordicflame
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    08-18-2010 02:45 PM
    I believe your asking about a 496MAG or 496HO...
    If so, they are closed cooled motors and have a different water setup.
    I have several Diacom readouts and all read 3-7 at idle and 34-43 at 5000+ rpm on various boats.

    Dave
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