I have a few salt encrusted nuts that I can't shift - they are on the pissers that take water from the engine thru the hull so I can't get a lot of leverage on them - does anyone have a trick on how to free up these frozen nuts?
Irwin do a product called BOLT GRIP which fit over then out side of nuts that are rusted and rounded of and work a charm. One of the belt tool sets i have bought. I got mine form Blackwood Plykels at about $45. alternatively use a 6 sided socket rather then a 12 sided socket or use an imperial socket that is slightly under sized and hit it on with a hammer to get a tight fit. Use a power bar such as a steel pole placed over the wrench or spanner to get more leverage. Also i regards to the heating option, make sure you heat it fast as to only heat the outer nut so that expands and the inner bolt does not. I would recommend to also put WD40 on it over night to let it soak in. Hope you win.