Water PSI

[Debt-icated]

Where could i find information that tells me what my Water PSI on my sea water pump should be at say 3200 -3800 rpm? I run a 350 MAG with Seacore and can not find this information in my manual. I just replaced my sea water pump assembly due to a bearing failure, so i want to be sure everything was pumping as it should. Yesterday, my smartcraft gauge was fluctuating between 15.5-17.1 PSI at cruise speed. Engine temp was about 168 degrees

 

[scoflaw]

Those are good numbers. No clue if Merc concurs with that

 

[LG111]

That' the range. Idle around 2-3 and cruise mid teens.

Though the pressure really means nothing. As long as temp and flow are good, pressure is just a number.

If flow or temp changes which you'll see first then you'll know pressure is changing.

Example
Impeller loses a blade. Pressure would drop and flow would slow.... but if that blade got stuck in the cooling system the flow would slow temp goes up but pressure would remain or go up due restriction.

Or the impeller is good but the housing is scored. Temp goes up, flow goes down and the pressue drops below normal.

So temp and flow are most important to baseline.

 

[Bt Doctur]

you still have the old pump, can be rebuilt