Re: Mercury KF7 rusted tight powerhead

[20mercman]

I have been pretty lucky getting motors apart that have been pretty stuck. I did have a pair Mk-25 blocks that I resorted to sawing the connecting rods off as I had tried everything to get them apart. I soaked it for over a year! As crazy as it sounds, I was able to salvage one crank and one crankcase. The blocks had severe pitting that would need a sleeve to repair. I finally used a hydraulic press and it took over 9,800 lbs. of force to get it to move! These had been left outside behind a shed for years. Other than those, I have been able to free up over a dozen others that are now running, several using the grease gun method I described. If you have time, let it work.

Steve