Hello, I am quite stumped here and looking for some help. I have a 1971 Johnson 125hp. I have replaced the impeller, housing and key after noticing the engine was getting hot. After replacement, I was getting good flow (as seen exiting at the water exhaust ports), however, only the port side cylinders were cooling. With a thermal gun, the block stayed around 147 degrees. We killed the motor after the starboard side would get to 170. We have removed the lower unit to make sure there was no connection issue between the pump and water tubes.
A marine mechanic suggested checking inside the thermostat. But when you look at the manual, the water flows from the pump directly to the cylinders before returning to thermostat which decides whether to return water to the pump or eject it. We did remove the hoses to the bottom of each cylinder and noticed water flowing freely from the port side but no water from the starboard side.
what is the next best step? If there is a blockage in the starboard side, where do I begin to clear it?
thank you for your help.
J
A marine mechanic suggested checking inside the thermostat. But when you look at the manual, the water flows from the pump directly to the cylinders before returning to thermostat which decides whether to return water to the pump or eject it. We did remove the hoses to the bottom of each cylinder and noticed water flowing freely from the port side but no water from the starboard side.
what is the next best step? If there is a blockage in the starboard side, where do I begin to clear it?
thank you for your help.
J