high pressure water mercruiser 350 mag 5.7 bravo 3 2013

pdr19

I have a problem with high water pressure since I changed the impeller of the water pressure sensor and still has the same problem, could someone tell me what the problem is?

skennelly

So you have an alarm saying low water pressure?

LaRea

Probably a blockage downstream from the pump.  I'm guessing it's fresh-water cooled, and you have pieces of a broken impeller stuck in the heat exchanger.  Take the end caps off the heat exchanger and clean out any debris.

Welcome to the forum.

reneechris14

Welcome to the forum.
You said high pressure is this a reading from vessel view? I would agree with LaRea flush out the system the best you can.

pdr19

high pressure in 3500 rpm pressure 90 psi ,new impeller, new water pressure sensor but I noticed that when the mechanic changed the impeller of the pump it was when the pressure went up

reneechris14

Yes 90psi is to high, are you sure you used the right water pressure sensor was the right part number the oil pressure sensor looks the same and uses the same plug. Just a thought.

pdr19

If it part #8M6000623 water pressure sensor and impeller kit #862232A2

rasbury

did not know there was a water pressure sensor..where is it? I sure know there is one on the power steering cooler...

pdr19

Power steering cooler, back of the engine. 

pdr19

In neutral it marks 16 psi, 18 psi how it is not exact since when I raise the rpm 2500 to 3500 it star to mark 90 psi 100 psi of there is low to 80 psi it stays high but no stable, tomorrow I was in taking it to the workshop where see what Bass Pro Shops is where they changed the impellent and the pressure sensor , I see  that when they changed the impellent was when the water pressure started to get out of control, tomorrow they will tell me

LaRea

Yeah, gotta be a bad sensor.  Even if the heat exchanger was 100% blocked, there's no way that pump is capable of making 90 psi.  

Black_Diamond

90psi would blow the hoses off if not burst them.