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15 johnson has water at the tell tale hole but still overhea
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<blockquote data-quote="nomowork" data-source="post: 205473" data-attributes="member: 6029"><p>I had a very similar problem with an older 15 hp Johnson. It overheated, shut down and restarted when cooled. The pee stream was good at times and non existent at other times, but still ran.</p><p></p><p>I did the normal replace the impeller trick but that did nothing. I tried forcing water up the intake tube in the lower unit and a pee stream came out, but not the normal force. I removed the thermostat and it worked alright so decided to check the water passages in the head. It looked okay. I read on the web about a guy who modified the elbow on the tell tale hose by drilling a hole in the elbow and inserting a wire or something similar directly into the cooling jackets. I did that and used a weed wacker line string and was able to shove more than a foot of it through the jackets! I then blew some compressed air into the hole in the elbow and you should have seen how much sand, silt and krap came out of the hole below the thermostat! BTW, plug that new hole with a machine threaded screw and drill a new hole in the lower cowling to accomodate that screw. If you need to clean out the pee hole while on the water, it makes it a lot easier!</p><p></p><p>Just because you have a pee stream, doesn't mean the water is making it through all the cooling passages.</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="nomowork, post: 205473, member: 6029"] I had a very similar problem with an older 15 hp Johnson. It overheated, shut down and restarted when cooled. The pee stream was good at times and non existent at other times, but still ran. I did the normal replace the impeller trick but that did nothing. I tried forcing water up the intake tube in the lower unit and a pee stream came out, but not the normal force. I removed the thermostat and it worked alright so decided to check the water passages in the head. It looked okay. I read on the web about a guy who modified the elbow on the tell tale hose by drilling a hole in the elbow and inserting a wire or something similar directly into the cooling jackets. I did that and used a weed wacker line string and was able to shove more than a foot of it through the jackets! I then blew some compressed air into the hole in the elbow and you should have seen how much sand, silt and krap came out of the hole below the thermostat! BTW, plug that new hole with a machine threaded screw and drill a new hole in the lower cowling to accomodate that screw. If you need to clean out the pee hole while on the water, it makes it a lot easier! Just because you have a pee stream, doesn't mean the water is making it through all the cooling passages. Good luck. [/QUOTE]
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15 johnson has water at the tell tale hole but still overhea
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