Reply To: 1968 Johnson 40hp overheating

[lindy46]

billw wrote:

Frank and Don certainly know many volumes more about these engines than I do. All I know is what I have personally experienced; and that is problems with cooling, when running them in a barrel. No other models ever gave me any problem but RDs and Big Twins gave me fits. Before you burn any more gray matter, how hard would it be in your situation, to put it on a boat transom and even just back it down a boat ramp on a trailer? Maybe you’re not set to do that yet; but if you can do it, that sure is what I would be trying next….

I can see that water circulation would be better when moving down the lake. That may be all there is to it. Might have to be my next step.