I have an on-going issue with this engine overheating. I had problems earlier this year that a new water pump impeller took care of but the problem is back. Unfortunatly, the slip I am in now is very shallow. Just about every time I start the engine, it sucks up some thick, black mud from the bottom, even if I dont put the outboard fully down when starting. What usually happens is I get the motor running and from 15 to 60 seconds later, the horn starts blowing solid and the S.L.O.W system kicks in. At times, I have found and removed debris from the thermostats that cured the problem. Other times, I have found nothing. Could the water passages in my heads be clogged with hardened mud ? My water preassure gauge will show 10 psi or more and I had a good tell-tail stream going when the alarm sounds. Should I remove the thermostats and see what happens ? I think my pump is OK cause when everything is working, I get 25 PSI or more on the water preassure gauge. By the way, does the gauge sense preasure before, or after the heads / block?
