496 SEA WATER PUMP PRESSURE

[goldeneyee]

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...

 

[35 Lightning]

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.

 

[Knot 4 Me]

I want to say low 20's at those RPM.

 

[bajabob 718]

at idle i get 5 wot 15 and mine in the intake

 

[WATCHUS]

I get 0 at idle and 15 at runnung mid to high
Rich

 

[Nordicflame]

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