Re: 1965 johnson 40hp rdsl 27-m
i have a johnson 40hp i started last week and one of the questions is how much of water should be coming out fron the muffler part on the up part of the engine? and if it is normal that i see oil mixed into the water? i tested it in a barell and i has mixed oil at the end of the teston the water, is that normal? thanks
Last question first: Absolutely. In fact it will be quite messy after running awhile.
Water discharge: There should be some spray out the exhaust relief any time the motor is running. There will be a heavier spray when the thermostat is open. Most of the discharged water goes out with the underwater exhaust.
That motor has a thermostat controlled, recirculating cooling system. The water pump supplies water through the powerhead, and then it is presented to the thermostat. If it is not 140 degrees or more, it is directed back down to the water pump for recirculation. When it gets warm enough to open the thermostat, it is discharged and replaced with cool water.
What I just described is a constantly changing situation. The thermostat is always sampling the water and opening and closing as necessary to maintain proper temperature. This is why the amount you see being discharged is always changing.
BTW, this is exactly how the cooling system on your car works, except there the hot water goes to the radiator for cooling instead of overboard to be cooled in the lake.
