[C320-list] Keel Ground or Zinc?

[argates2nd at comcast.net]

I recently used the Assn torque wrench on my wing keel nuts and 8 of the ten torqued to 235 ft. lbs.  I went in a shallow slip and torqued once resting on the bottom at low tide. 

The other two are badly corroded and will not budge so far.  Yesterday I tried an impact wrench at 425 ft lbs from a rolling compressor! 



I have been applying liquid wrench for a week and naval jelly.  Yesterday I had a local suggestion of Coca Cola for 4-5 hours and then torch heat (if that works I am giving up drinking coke). 



It appears that the corrosion is due to electrolysis, or the two are not 316 SS.  Our bronze shaft zinc lasts well (more than a year) and we are in a large marina. 

Have others grounded their keel or put a zinc on the keel?  If so, what is the process? 



Rollie    #182      Charlotte Harbor, FL 





p.s.  the 1" 316 SS nuts have 8 threads per inch and are $6 from our local industrial supplier in Punta Gorda, and the Assn socket is 1 1/2" but I am now using a 

         1 3/8" socket since chipping away corrosion.