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sea cocks

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eric clubley View Drop Down
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Post Options Post Options   Quote eric clubley Quote  Post ReplyReply Direct Link To This Post Topic: sea cocks
    Posted: 18 Nov 2013 at 6:48pm
How often do you take sea cocks apart completely? And are there some that you prioritise? Does it depend on their materials and design?

What should I watch out for?
My boat is on the hard until March 2014

Thanks 

Eric
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moongirl View Drop Down
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Post Options Post Options   Quote moongirl Quote  Post ReplyReply Direct Link To This Post Posted: 18 Nov 2013 at 7:24pm
In the past I have taken all sea cocks apart every Winter and inspected then serviced as necessary. Most boats have Blake's Bronze units which are very robust and don't seem to suffer from de- zincification if anodes are in place on the boat.
Points to watch out for! Don't lose the nuts holding the plate that in turn holds the plug in - they are expensive.
If wear is a problem a little auto valve grinding paste soon restores a snug fit
Use Blake's grease.
I have raised the question of the cockpit drains several times. The whole assembly of Bath waste, plastic hose and galvanised steel fittings is a disaster waiting to happen & getting to a seacock with a wooden plug whilst at sea would be an unenviable task - bad enough when the boat is on the hard!
Good luck!
PS Don't touch the bolts holding the seacocks or rather the nuts as the bolt heads are usually glassed into the hull moulding - in my experience the bolts are stainless & do not suffer from corrosion
COLIN
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eric clubley View Drop Down
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Post Options Post Options   Quote eric clubley Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2013 at 8:54am
Thanks Colin
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doug View Drop Down
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Post Options Post Options   Quote doug Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 11:15am
I do the heads 3 and engine, every year, as they are used often and I find the grease can be driven out causing dribbles.
The cockpit and galley tend tend to be less used (if at all) so I check then every winter and dismantle them if I feel they need it.
As mentioned, the cocks are fixed using stailess bolts(JR probably saw the cost of the bronze ones and shuddered), this might cause corrosion problems but I have never seen it.    When I replaced a seacock I was careful to use gloop and nylon washers under the nuts.
The cockpit drain set up is not ideal, I generally give it an inspection, a wipe of the oily rag and cross myself.
 
PS
 
If the boat was new to me I would tackle them all.


Edited by doug - 20 Nov 2013 at 11:18am
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eric clubley View Drop Down
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Post Options Post Options   Quote eric clubley Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 12:13pm
Many thanks Doug. 

eric
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Post Options Post Options   Quote eric clubley Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 4:21pm
I've just re-read the specification for Ashlin which says all the sea cocks are 'Blakes', though bolted bronze.  She is one of the 87 or so built in Canada and the previous owner, Declan Mackell upgraded a lot of things after sailing anorther CO 32 round the world solo.

I guess the Blakes type aren't standard? Still worth dismantling I guess?


regards


Eric
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Post Options Post Options   Quote waratah912 Quote  Post ReplyReply Direct Link To This Post Posted: 20 Nov 2013 at 9:22pm
Dismantle and regrease all of them every time the boat is out of the water, typically every two years. If a hose splits, it's a bad time to find your valves are seized! If the cockpit drain valves are stuck, warming them with a hot air gun (carefully!) is amazingly effective. Also buy short spanners or be prepared to cut some open ended ones in half or it will take all day! - though you may have a more user friendly layout that my 1974 UK boat.
Paul Smith
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Post Options Post Options   Quote admin Quote  Post ReplyReply Direct Link To This Post Posted: 21 Nov 2013 at 12:57pm
Originally posted by eric clubley

I've just re-read the specification for Ashlin which says all the sea cocks are 'Blakes', though bolted bronze.  She is one of the 87 or so built in Canada and the previous owner, Declan Mackell upgraded a lot of things after sailing anorther CO 32 round the world solo.

I guess the Blakes type aren't standard? Still worth dismantling I guess?


regards


Eric
 

Blakes are the best you can get in terms of what they are made of and their design, far better that ball valves made of DZR/CR bronze (or far worse unsuitable materials).  Standard production boat builders don't fit Blakes because they are expensive, but they also (should) last a life time.  Mine are 35 years old and almost as good as new.

 

 

The heads seacocks get a lot more use than the rest so tend to need a nip-up mid-season because the grease has worked its way out (we have a rule about switching off after use), the rest last a season between servicing with ease.  I tend to strip and reassemble the cockpit seacocks every 2-3 years as they only get turned a few times a season (to ensure that they work ok) so they don't really squeeze out the grease.

 

 

It's worth looking out for and using Blakes grease, it's formulation seems to work better than the standard white grease often seen in the chandlery.   That said any waterproof grease should work ok.



Edited by admin - 21 Nov 2013 at 12:58pm
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Post Options Post Options   Quote eric clubley Quote  Post ReplyReply Direct Link To This Post Posted: 22 Nov 2013 at 9:54am
many thanks again


regards


eric
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