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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 250 Specific Forum
 Centerboard stainless hardware failure		  New Topic  Topic Locked
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conchjoe
Deckhand

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USA
7 Posts
Initially Posted - 10/30/2010 :  06:51:34  Show Profile
I own a 1998 Catalina 250 WB. I am the 2nd owner, and prior owner and I have kept it in the water at Sarasota, FL.

In October this year I had the boat hauled for the biannual bottom job as well as to repair/replace the centerboard sheave, which had failed on a rough overnight stay. I know since I awoke to a loud crash, and thought I was dismasted. Underwater inspection next day showed the CB block hanging on the CB line. Kent of Catalina indicated by Email that the two ¼” bolts had probably backed out or failed in some way. The CB could still be raised but not into the slot.

At haul out after pressure washing, I discovered that the failure of the CB sheave was due to the weld failure of the block. The SS 3/8” bolt and SS bushing holding the sheave to the block were severely deteriorated. The heads of the two bolts had also failed. We also discovered that the port side of the CB hinge was not secured but hanging. This was due to failure of the two SS bolts holding the hinge.

I replaced both CB sheave and the CB hinge with all new SS fasteners. Note that the shackle, etc. attaching the lifting line to the CB were in good shape.

Previously, shackles securing the CB raising system in the cabin had twice failed and were replaced. As others have noted, water comes up the hose and douses the CB lifting tackle.

I believe that the failure of the SS fasteners and was due to corrosion (oxidation) of the stainless steel. Since all failures occurred at or near surface and affected SS items where they receive a good dose of salt water and air. SS items below surface were not affected as greatly.

Suggestion: those of you who keep in water, change SS fasteners on haul out.
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bear
Admiral

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USA
909 Posts
Response Posted - 10/30/2010 :  07:39:32  Show Profile
Conchjoe,Are you sure everything that deteriorated was stainless steel?
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conchjoe
Deckhand

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USA
7 Posts
Response Posted - 10/30/2010 :  07:41:29  Show Profile
Everything was SS.
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 10/30/2010 :  10:00:52  Show Profile
There are grades of SS. For this use I would go for the highest grade. Any chance that this could be caused by stray electric current in the water near your boat causing rapid oxidation?
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zeil
Master Marine Consultant

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Canada
1314 Posts
Response Posted - 10/30/2010 :  17:30:14  Show Profile


This link maybe of some help... please note the picture of the self sacrificing zinc attached to the CB suspension

http://www.catalina-capri-25s.org/forum/topic.asp?TOPIC_ID=20774& SearchTerms=electro



No... not bubblegum stuck to the underside of the boat but a self sacrificing zinc screwed to the centerboard suspension.

1) I wonder how one would protect the (brass?) turning ball and (SS?) mounting pin when using a non-conductive Vectran rope like up-haul cable...
2) When the standard ss cable is used...
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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.