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Author Topic:   Water pressure??
mercman posted 07-08-2004 01:42 AM ET (US)   Profile for mercman   Send Email to mercman  
Can anyone tell me how much water pressure should a 50h.p. Mercury??
jimh posted 07-08-2004 12:50 PM ET (US)     Profile for jimh  Send Email to jimh     
Your owner's manual can probably tell you this information.
newt posted 07-08-2004 01:05 PM ET (US)     Profile for newt  Send Email to newt     
I'm not sure you will find it in your owner's manual. My 90 hp Mercury manual doesn't list it, but I do have it somewhere in the instructions for the water pressure gauge. I will take a look for it at home tonight.
Marlin posted 07-08-2004 09:58 PM ET (US)     Profile for Marlin  Send Email to Marlin     
I noted my Merc 115 4-stroke's water pressure at every 500 RPM, graphed it, and put it in the back of my logbook with the speed vs. RPM and actual gallons vs. tank reading graphs. Now I have a baseline to compare with over time, and I'll know right away if my water pump isn't up to snuff any more.

That engine runs about 15 PSIG at 3500 RPM, but I'd imagine that could easily be quite different between different makes and models.


newt posted 07-09-2004 07:47 AM ET (US)     Profile for newt  Send Email to newt     
I couldn't find the instructions last night, but I will look again. The pressure definitely varies from between models. I know for the 90 hp classic motors a 0-15 psi guage is required, but some models need a 0-30 psi gauge.

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