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 Block at base of mast
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Oneday
Deckhand

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USA
20 Posts

Initially Posted - 06/10/2022 :  01:48:54  Show Profile  Reply with Quote
I have a 1986 swing keel. It has a block on each side of the base of the mast, one for the main and one for the jib halyard. I would like to change those. They are available from cd but I can’t get the screws loose. They seem totally frozen. Any suggestions? Thanks Dan

islander
Master Marine Consultant

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USA
3944 Posts

Response Posted - 06/10/2022 :  04:28:22  Show Profile  Reply with Quote
As you have found out, Stainless screws that are screwed into aluminum can corrode and lock together. What every boater that works on boats should have in their tool box is an Impact screwdriver. This tool works by hitting the end of the tool with a hammer and it then transfers a sharp twisting motion to the screw to remove it without destroying the screw head.

Scott-"IMPULSE"87'C25/SR/WK/Din.#5688
Sailing out of Glen Cove,L.I Sound



Edited by - islander on 06/10/2022 05:01:16
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Leon Sisson
Master Marine Consultant

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USA
1873 Posts

Response Posted - 06/11/2022 :  12:22:08  Show Profile  Visit Leon Sisson's Homepage  Reply with Quote
I agree with Scott about the usefulness of an impact driver.  However, I suggest first applying penetrating oil and heat.  A soldering iron might be a good way to heat just the screw with minimum risk of starting a fire.  A few heat/cool cycles should help loosen some of the corrosion before wailing on it with the impact driver.

— Leon Sisson
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Stinkpotter
Master Marine Consultant

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Djibouti
8905 Posts

Response Posted - 06/11/2022 :  20:36:31  Show Profile  Reply with Quote
PB Blaster... penetrating oil plus I don't know what, but given some time (like a day or two), it can do wonders. Then whack the head of the screw with a hammer (semi-gently).

Dave Bristle
Association "Port Captain" for Mystic/Stonington CT
PO of 1985 C-25 SR/FK #5032 Passage, ex-OUPV,
Now on Eastern 27 $+!nkp*+ Sarge

Edited by - Stinkpotter on 06/11/2022 20:37:31
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Derek Crawford
Master Marine Consultant

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USA
3300 Posts

Response Posted - 06/12/2022 :  13:58:38  Show Profile  Reply with Quote
And when you replace them don't forget to use Loctite.

Derek Crawford
Chief Measurer C25-250 2008
Previous owner of "This Side UP"
1981 C-25 TR/FK #2262 Used to have an '89 C22 #9483, "Downsized"
San Antonio, Texas
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Voyager
Master Marine Consultant

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USA
5083 Posts

Response Posted - 06/13/2022 :  21:47:20  Show Profile  Reply with Quote
Loctite? or Never seize?

Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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Derek Crawford
Master Marine Consultant

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USA
3300 Posts

Response Posted - 06/14/2022 :  06:24:25  Show Profile  Reply with Quote
Bruce, I am having a senior moment, I can't remember. It's at least 15 years since I last used it...It's whatever stopped the galling.

Derek Crawford
Chief Measurer C25-250 2008
Previous owner of "This Side UP"
1981 C-25 TR/FK #2262 Used to have an '89 C22 #9483, "Downsized"
San Antonio, Texas
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Voyager
Master Marine Consultant

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USA
5083 Posts

Response Posted - 06/14/2022 :  08:33:42  Show Profile  Reply with Quote
The corrosion created by aluminum contacting stainless steel comes from a galvanic process. I believe that dielectric grease is the answer in this case. Some products are Corrosion Block or Silicone Paste.

Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT

Edited by - Voyager on 06/14/2022 08:44:08
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