Reply To: Water seems to not be flowing. 1964 28 HP Evinrude Speeditwin 28402M

[bob-d]

Having chased poor water flow on my 64  28HP I would like to offer a few suggestions.
First there is absolutely no thermostat.
Drop the lower unit, hook a hose directly to the pick up tube and run it to see if it runs and stays cool.
If that works next check your lower unit. Look under the plate where the impeller is. The metal webbing is know to crack, as the water in this specific year motor does not drain properly, and can freeze over the winter. This causes cavitation and poor circulation going to the head. This was the problem I had. I was lucky to find a replacement lower unit, but if you can’t you can try rebuilding it with some JB Weld.
If you look up 28HP overheating issues on this forum you will see my thread.   I drove Don ( Fleetwin) and Frank crazy for months trying to figure my overheating problem out. Frank finally came up with the solution having seen the webbing crack on a few motors he worked on.
Hope this helps.
Bob D