Re: Mercury KF7 rusted tight powerhead

[mr-asa]

I prefer to initially use a fluid that will seep in and penetrate into the rings. Transmission fluid and gentle heat usually does it for me. I generally try to plan on doing the easiest reversible course of action first, if you went with grease first you would be hard pressed to get it out enough to let everything in to soak.

The next one I get that needs it, I plan to get about 3 gallons of this stuff and toss it into a 5 gallon bucket along with the powerhead. It dissolves oil, carbon, and somehow transforms rust back into normal iron/steel.
http://www.berrymanproducts.com/product … s-cleaner/