Reply To: Johnson RDSL-21 mercury Switches

[Tom Alexander]

Hi Frank & Mumbles:Thanks again for all the info. Today I ran the engine again several times. I have cut down a plastic 55 gal. drum and have the motor on the back of the boat hanging into the water. After looking at your u-tube vid with the cooling water, today I was focused on cooling. I never ran the engine at any time for more than 3 or so minutes with at least 45 minutes before starting it again. I ran it first time with the hose from municipal water supply coupled into the plate I bought to allow pressurized water into the side water intake with the engines lower part still immersed . With this arrangement I did get s ’spray’ of water coming out the port below the cowling on the rear off the engine. After shutting down I removed the plate and the next test run was done with the lower unit submerged so water level was a couple of inches above that side water inlet port. When the engine was running this way I saw only steam(?) coming from the water outlet port. Note that I wasn’t running the engine long enough (in my opinion) for the thermostat to do anything but circulate water inside the engine, but there was a noticeable difference between forcing water into the port and having the water pump suck water from the drum. When I ran the engine the first time this AM I got a lot of oily scum on top of the water in the drum. I put an oil absorbent diaper on top of the water and it sucked up 95% of it. But still it was amazing to see what was coming out of the exhaust! I should mention that there is a new water pump body and impeller in the engine as well as all the other new seals bearing and whatnot I put in when rebuilding the gear case. I have a test wheel on the shaft and it makes quite a froth of the water in the drum and I wonder how effectively the pump can pull this air water mix up. Just wondering. Now I have to learn how to post video onto u-tube.Your use of u-tube is impressive. Talk about a picture being worth a thousand words!  In my job (now retired) we used a corporate platform and had IT folks to help. I should be able to get the hang of it now I have a need. I will copy this and put it as a reply on the thread in the AOMCI site so it should get thru one way or another. BTW the drawings of the elect system are spot on as to what is in the boat/motor combo. Once I get the proper solenoid I can reinstate the mercury switches and be back to ‘as manufactured’!  Thanks  Tom Alexander