I have a 1997 Mercury Mariner 200HP EFI, serial#OG571537. My question is- using the muffs for cooling water I am not getting water flow to the pee hole. I have rebuilt the poppet valve, changed both thermostats, new water pump installed, checked all cooling lines running from the thermostats, poppet valve, and down. There is water running through the engine as it is coming out above the cavitation plate. Checked the operation of the thermostats in hot water and they open as they should around 143 degrees. I do notice that the starboard head is getting warmer than the port head. I had pulled the heads and checked for anything unusual, but found nothing. As a test, I took out the starboard thermostat and put the cap back on. Ran the engine and the water flow was great. Put the thermostat back in and the flow quit.
Any suggestions on what I could look for next?
I do let it run for 5-10 minutes but still no water discharge. I can pinch the hose below the pee hole and do get some discharge. I have back flushed the thermostat holes, ran water up the water pump tube in the mid section. Blew air into hoses. Seems like not enough water pressure to cause the water to exit through the pee hole. When you install the impeller is it correct to turn the drive shaft clockwise to orient the impeller in the water pump housing?
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