running too cold

[jmphoto]

I have twin 1994 175 hp mercury black max both run great but after replacing the water pump and stats . the starbord is running fine, the port warms up like the starboard but then the port side goes cold . I crossed gages and no difference switched stats no change I can put my hand on the head and its cool the starboard too warm to keep hand on.Good water flow from the pisser whats going on . could the poppet valve be stuck open and cause it to run cold ?

 

[gradyreelez]

Sounds like a stuck thermostat(s). I had the same problem on one of my Suzukis. It was running cold and I found some indications of water in the oil. Changed the thermostats and the problem wnt away.

 

[Tucker]

He switched stats so that can't be the problem. I believe the Mercs have a PRV (pressure relief valve). I bet this is stuck open. Everyone forgets to change these.

 

[Tucker]

Yep, poppet valve is the same thing. You can tell by checking the relief holes on the upper part of leg. If water is coming out at idle it's stuck open.