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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 sister keel bolts		  New Topic  Topic Locked
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tidesailer
1st Mate

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USA
53 Posts
Initially Posted - 03/18/2011 :  20:16:00  Show Profile
I have done a search on installing sister bolts. I have the stuff to install the studs but does anybody know the depth of drilling and tapping. Im sure the kit provides instructions but I have purchased tap and drill elsewhere. Also do you install them right next to the old studs? thanks you Don
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Jan Briede
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USA
162 Posts
Response Posted - 03/20/2011 :  18:11:23  Show Profile
When I did mine last summer I drilled approximately 3 to 4 inches into the cast iron. I placed 6 bolts near the older bolts (not more then 2 inches away). The problem was the drilling; that was a job. Moreover, I was disappointed by the drill that CD sent me, and ordered a different one. It is absolutely important to first drill a pilot hole. I'll try to post a picture of my setup a little later (or tomorrow).
Jan
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tidesailer
1st Mate

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USA
53 Posts
Response Posted - 03/20/2011 :  23:05:23  Show Profile
Thank you for your help Jan , I have herd that drilling a pilot hole helps alot. I heard it is pretty rough drilling into cast iron. I bought a can of some good tapping oil and a heavy duty drill.. wish me luck ...Don
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Jan Briede
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USA
162 Posts
Response Posted - 03/21/2011 :  06:45:36  Show Profile
What saved me was to buy some long (12") top of the line 1/4" drill bits at Lows and used them with a good smaller hand drill to drill the pilot holes. Accessibility was an issue, but the tactful placement of the holes gave me access and this did wonders after fighting on my first two two holes that I did not have access to with my smaller hand drill.
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tidesailer
1st Mate

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USA
53 Posts
Response Posted - 03/21/2011 :  07:52:26  Show Profile
Jan, did you drill thru wood? I was told thier is wood under the fiberglass,if so was it dry or saturated from water? thanks...Don
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 03/21/2011 :  08:15:15  Show Profile
When I sistered my cast iron keel I used four studs. One inside of each of pair of the existing end studs and one on each side of the existing center studs. Part of the reason I took that approach was it was a lot of work to drill those holes and the 6 original studs were still maintaining their grip. I used 3/4" all-thread for studs which is a larger diameter than the existing studs. There is a 1" thick wooden sole you will drill through to reach the cast iron keel.
Edited by - Sloop Smitten on 03/21/2011 08:16:00
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Jan Briede
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USA
162 Posts
Response Posted - 03/22/2011 :  08:15:33  Show Profile
Don, Yes I did. I made sure that I let the sill/sole dry out after I drilled the initial hole through the wood (I let it dry for a few weeks actually) and then I filled the holes with penetrating epoxy. When that was dry I re-drilled the holes and went for the cast iron.
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tidesailer
1st Mate

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USA
53 Posts
Response Posted - 03/22/2011 :  09:38:11  Show Profile
Jan Im going in with 1/2-13 stainless steel threaded rod 3/4 size sounds alot beefier stronger, good idea. So jan the wood soul was sound just needed to be aired for some time to dry?
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Jan Briede
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USA
162 Posts
Response Posted - 03/26/2011 :  12:08:14  Show Profile
I would dry it for a week or so ... better safe then sorry
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.