need help no water pressure reading

[519 ranger]

i have 2004 mercury 200 hp 3.0L efi ,109hours on it ,no reading on water pressure gauge or smart craft but pumping water(spray) i switch gauges ,not gauge. i have blown air into the lines and still no water pressure. can anyone help me? what is the temp. on this motor ilding and full throttle? this motor does have low water pick up on the nose cone.thank you robert e-mail me pudgyfrogs@sbcglobal.net


Modified by 519 ranger at 11:27 AM 4/3/2009

[06champ198]

Sounds like you need a water pump to me. Have you replaced it recently?

[EuropeanAM]

Several possibilities:

-Water Pump
-Poppet Valve
-Thermostats
-Powerhead or Adapter Plate Gaskets
-Water Tube or Seals

For the BEST RESULTS in troubleshooting.... always start AT THE SOURCE. Replace water pump components as needed... and then see where you are AFTER you've done that.

Think of it this way: you go out to wash your car. You grab the sprayer, and pull the handle.... nothing happens. What do you do? Hopefully, you go back to the water spiquot to see if it's turned "on"... and check the hose for kinks. Wouldn't do much good to take the sprayer apart FIRST, right?

[519 ranger]

just bought motor dont know if its ever been replaced on 1 to 10 how hard is it to replace water pump? what is a poppet value? thank for the help again

[transdep1]

Ranger, replacing a water pump is not that hard....see this link.
http://www.bassboatcentral.com/sttipswp2.htm

I got my parts from Don last week.
Thanks Don.

[EuropeanAM]

+1 Sherm's tips should help you through replacement.

A poppet valve is a "spring and diaphram pressure regulator" located at the bottom of the cooling system. It contols maximum water pressure (and flow) at higher RPM's (rendering the thermostats "along for the ride" above approximately 4000 RPM's).