Bought a 1967' johnson HP, not working. Replaced the electric shift cable, water pump, and oil retainers. Starts up fine and it engages in gear fine. Back plate on the motor isn't getting very hot, but I'm not seeing any water come out. Question is, were does the water come out at? Is there thermostat or somthing that regulates the flow of the water? I didn't want to run it very long just in case. Any input would be appreciated. Thanks