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Keel Bolts and General Topics on Keel - 411 keel bolts and lead keel coating |
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Join Date: 06 September 2013
Posts: 53 |
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411 keel bolts and lead keel coating |
Join Date: 03 February 2011
Posts: 39 |
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Hello Don. Upon keel damage got good help on this forum including thread August 15 2011. Had a severe bottom touch in early summer 2011 but got aware how extensive it was only when hauling much later. There was a leakage with same amount water through summer with lots of sailing so they must be extremely well built this area too. Thorbjorn/Ravn 411/36 |
Join Date: 02 January 2008
Posts: 1547 |
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Dear Don
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Join Date: 06 September 2013
Posts: 53 |
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Dear Don Suggest it is checked if a keel bolt is leaking. This can be done ashore, but the boat should be lifted so the crack opens, with some water in the bilge. If you see water trickling out from the crack the bolts in that area need to be sealed as described in the thread mentioned by Thorbjorn. The crack in your case appears to be so narrow that it is hardly possible to get mastic into it from the outside, and the mentioned inside filling method is recommended. There are 8 off M24 bolts, and 2 off M20. The mentioned torques were given for ungreased threads, but if there is uncured mastic on the threads this works really well as grease, and then 68% of the torque should be used. The added external layer on the keel is best removed. Stainless and lead both quickly form an oxide layer on their surface in air, and this prevents paint from attaching properly, but a special procedure can be used, described for stainless in an earlier thread. Basically wet sand the lead surface using the paint primer as wetting agent, this prevents oxide from affecting the bond. Kind regards Lars Thanks, Guys.
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Join Date: 02 January 2008
Posts: 1547 |
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Don
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Join Date: 06 September 2013
Posts: 53 |
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Thanks, Lars
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Join Date: 03 February 2011
Posts: 39 |
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Hello Lars and Don, on Ravn, hull 36/1979, the two 20 mm aft keelbolts were placed 320 mm and 550 mm measured from center of the aft of the three bolts at lifting eye. With the Perkins still in there was just sufficient space for access to the bolt when taking out compressor for refrigerator. Thorbjorn/Ravn
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Join Date: 06 September 2013
Posts: 53 |
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Thorbjorn/Lars
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