Water pressure ( 2000 Mercury 200 EFI )

[jashou2003]

What is the normal water pressure range I should see on my pressure gauges when @ 4500-5200 RPM's. I notice that both starboard & port motors are @ around 15-17 psi when running @ these RPM's. I just recently purchased this boat & comparing it too my buddies twin 225's Evinrudes his are around 35-40 psi. I know they are completely 2 different motors Merc & Evinrude but was curious on the matter. I'm getting a great flow of water coming out of both motors @ idle & @ high RPMS. Not sure if gauges are bad, or if I have a semi clogged line. Have'nt installed the new gauges yet not until I replace both water pumps / impellers. Hopefully this will solve my crisis. Any info would help.

 

[Dead Eye]

Re: Water pressure ( 2000 Mercury 200 EFI )

^

 

[gss036]

Re: Water pressure ( 2000 Mercury 200 EFI )

From my personal experiences, that is about normal, my Merc manual for my 89 200 hp shows 12 psi at WOT. I have seen some that will go to about 22psi. If you don't have a manual, call a local Merc shop and ask them what it should, different motors have different specs. Evinrudes have always had higher water pressures.<br />If you the water pump has not been done in the last 2-3 yrs, that definately would be 1st place to start, along with the thermostats.

 

[jashou2003]

Re: Water pressure ( 2000 Mercury 200 EFI )

Thanks alot gss, I guess I could save myself alot questions IF I had a manual. I need to get one to have personnally. It will save me the trouble of always trying to troubleshoot & ask questions. So you recommend doing the thermostats as well when I do the water pumps. I guess it would make sence, it all about the cooling.

 

[Silvertip]

Re: Water pressure ( 2000 Mercury 200 EFI )

My 75 Merc has the pressure gauge T'd into the tell tale and reads 7 PSI at idle and 15 PSI at 3500 - 4000 with a new impeller. I think your readings are normal.