Yes, good idea to replace with stainless backing plates - note that I say plates and NOT washers since the washers do not distribute the load as much as a large stainless backing plate - just make sure there are no sharp edges or corners on the backing plate.
i have yet to find keel nut torque specs but - i suspet around 100-150 ft lbs would do the trick - also place two stainless nuts on the bold and use loctite.
Hi Rick and all,
Just out at the boat on Saturday (she's on the hard, unfortunately, after a GREAT sailing season), and I looked carefully at the keelbolts and the mild steel washers. ACK! The washers appear to be bedded in 3M 5200! Now what????????? How in the heck do I remove them (not the bolts, the washers)??????