Home › Forum › Ask A Member › 1977 – 75hp Evinrude – water in all 3 cylinders…is it doomed? › Reply To: 1977 – 75hp Evinrude – water in all 3 cylinders…is it doomed?
Unfortunately, the 75hps are more susceptible to powerhead damage than the regular 70 models, so I’m guessing there is internal bearing/journal damage. For now, I would recommend reinstalled the head/gasket (if it looks OK), then removing the gearcase. Once the gearcase is off, you can start the engine to expel the water and clean off the bearings without worrying about additional water entry or impeller damage. Once the powerhead has been somewhat preserved, you can take your time pulling it apart.
And yes, it is best to pull the powerhead off when trying to remove that exhaust cover mess, you will probably encounter a few seized bolts.
Sure hope I am wrong about the bearing/journal damage, but I fear not…
I think I’m sunk. I’m sure this motor had this problem when my Brother picked it up on a boat last fall.
Now its on a stand without controls to run it on.
I stopped at the exhaust manifold plate removal when I realized I have to remove the powerhead…with the above situ, I feel am toast anyway and I wonder if I’m just wasting my time..
Can I ask why the 75’s are more susceptible to damage? I have a similar year (70hp) parts motor, if the powerhead is good, is it interchangable?
Because good 70’s are getting scarce here, are these motors worth rebuilding? (my 70 or this 75). A full rebuild kit is under $600 US plus my machining costs