marky1212
Member
"OK guys I got a good one for
"OK guys I got a good one for ya. 1987 Merc. 454 sea water cooled and have replaced the following: 1 head, both ex manifolds and risers, all hoses, thermostat, engine circ. pump, sea water pump,heat guage and sender. All water hoses including one to outdrive are free of any restrictions. My problem is that engine runs at 175 to 180 at all times. But when I am running wide open and then back down to idle it moves toward 210. I have put 2 new 140 thermostats in but no difference. The warmest part of the engine with a infered heat gun is right before water enters thermostat housing were sending unit is. It is the original housing but no obstructions that I can see when I had it apart to clean and install thermostat. Any help would be greatly apreciated"
"OK guys I got a good one for ya. 1987 Merc. 454 sea water cooled and have replaced the following: 1 head, both ex manifolds and risers, all hoses, thermostat, engine circ. pump, sea water pump,heat guage and sender. All water hoses including one to outdrive are free of any restrictions. My problem is that engine runs at 175 to 180 at all times. But when I am running wide open and then back down to idle it moves toward 210. I have put 2 new 140 thermostats in but no difference. The warmest part of the engine with a infered heat gun is right before water enters thermostat housing were sending unit is. It is the original housing but no obstructions that I can see when I had it apart to clean and install thermostat. Any help would be greatly apreciated"