Hello - I am new to this Forum I have a 1973 31ft Trojan Boat. She has twin 318 Chryslers 225hp engines. Raw water cooled She has an overheating problem on her portside engine. Both Exhaust manifolds are overheating,too hot to touch. The engine is being run without the thermostat in order to check water flow. There is water being pumped out the rear exhaust,but not much. The Sherwood Pump, dual ports has two new Impellars.

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CW turning pulley - Impellars turning CCW This is not a LM engine but I believe a LA engine Before I can go any further in trying to diagnoes this problem I need to find a Cooling Diagram or Schematic. I cannot find one anywhere. I am trying to figure out how the Water flows from the Water Pump to the Thermostat thru the water passages in the block and water pump housing.

Any replies will be greatly appreciated. If you do not have a strainer betwen the seaclock and the transmission cooler you may have the cooler stopped up with debris. Water passes through this before the pump. The cooler looks like the end of a mini boiler with small pipes that pass through cooling the transmission.