2002 Mercury 140 water pressure problem after rebuild

[Phoenix074]

Hi, i have a 2002 Mercury 140 and when cold the water pressure is at 10psi. When i ran it at 3500rpm it heated up and the water pressure went up to 23psi.

The engine was rebuild and i think there might be a leak somewhere.

Please help!

Thanks,
Julio A.

 

[Sammy67]

Did you replace the poppet valve? Did the poppet valve get put back in? Did you replace the thermostats?

 

[Phoenix074]

Did you replace the poppet valve? Did the poppet valve get put back in? Did you replace the thermostats?

Yes and thermostats.

The engine is a rebuilt and i suspect that is leaking somewhere not sure.

 

[Sammy67]

do a leak down test on it. That might tell you if its leaking internally.

 

[faztbullet]

Check hose routing and may have wrong base gasket under powerhead...