Reply To: 67 33HP Evinrude running very hot

[bob-d]

Don, I was running 24 to 1 for the break in.
Was running at about 2700 RPM for about 6 miles when I came down to idle and noticed the steam.
I then let the engine idle for 10 minutes and the steam didn’t subside. Since the motor had less than 3 hours on it never had it up to 4500RPM. Maybe it needs revs to get the water pumping to it cool down?
Started the motor in a barrel the next day (high idle with test wheel) and the same problem. The motor was immediately hot. Discharge was hotter than the water in the barrel.
All water pump parts new, impeller, plate and housing. Small hole in housing was open.
Will run a tap down the mounting holes.
As I mentioned before, the actual block was hot, the exhaust cover wasn’t bad, the cylinder head ok, the lower unit under the head burning hot and the water steaming.
I just wanted to thank everybody for their suggestions and help (especially Don). We won’t have a definitive answer until I get the boat back in the water next year with a new impeller, and the ability to actually check the various parts with a digital temperature gauge.
Maybe as Frank said, these motors just tend to run hot.
Thanks again,
Bob D