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engine seacock

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Blueshank View Drop Down
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Joined: 19 Jun 2012
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Posts: 6
Post Options Post Options   Quote Blueshank Quote  Post ReplyReply Direct Link To This Post Topic: engine seacock
    Posted: 25 Nov 2013 at 5:19pm
Hello

I want to replace my original 1977 "Stuart" engine cooling seacock with  a Blakes.
The Stuart has a slightly larger through hull hole and a 3 bolt pattern, whereas the Blakes
is a four hole pattern. I plan to seal up the old holes and start again.  The seacock is on the port side at the top of the keel void.

My thoughts are that I will put the blakes in the same place, reusing one bolt hole and drilling a new through hull hole through the repaired and filled old hole.   However, I am wondering if it would be better to locate it elsewhere and start afresh?

Any thoughts or advice welcome.

Tim
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moongirl View Drop Down
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Joined: 23 Aug 2009
Location: SOUTHSEA
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Post Options Post Options   Quote moongirl Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 2013 at 12:09am
Making good the old hole shouldn't be too much of a problem as the moulding is thick enough to chamfer the hole with a larger diameter on the outside such that water pressure is pushing the 'repair' into the hull.
Does the Blake's replacement have an outer plate? If so it will need to be well bedded, presumably using Sikaflex, to take up any curvature. The same will apply on the inside of the hull.
All the CO32s I have worked on have had flush seacocks with the bolts within the glass ie no exposed bolt heads. 
Your operation would be a good item to add to the Technical Section which is usually 'edited' by George & myself. Let us know how it goes.
Regards
COLIN
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Alan Dixon View Drop Down
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Joined: 07 Sep 2009
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Post Options Post Options   Quote Alan Dixon Quote  Post ReplyReply Direct Link To This Post Posted: 27 Nov 2013 at 12:42pm
I did exactly this job when I re-engined. The blakes had an outer plate/strainer. I used lots of sikaflex to bed it all down. When all had set I carefully removed the outer plate to cut away excess sikaflex from the opening. Thats a tip well worth keeping in mind.

Alan Dixon "Charlotte"
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