| Subject: Re: NASA log fouling |
Author:
nick
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Date Posted: 25/11/04 22:48:39
In reply to:
Simon Powell
's message, "Re: NASA log fouling" on 23/11/04 14:06:54
I agree fitting wooden plugs would be a bit tricky on the toilet seacocks, but for maintenance I think they were ideal.
A tip on blakes seacocks....
If they are siezed do not force them, there is such a large surface area of contact that you could rip them off the hull trying to get enough force into them to free them.
They are a cone design which means that tapped out from below as soon as they move a fraction of a millimetre they get easier to move.
To do this lift boat from water, undo nuts on top and remove top plate, put wooden drift up hole through hull from inside (this needs to be smaller than the diameter of the hole by enough to make sure it goes up into the valve) and whack it with a sharp blow.
The male cone should move away quite easily, even if badly siezed.
Now clean it and then smear with valve grinding paste and put it back. lap the valve back into it's seat as you would a valve, ie with a backwards forwards motion, occasionally lifting and replacing in a new start point so as not to get deep grooves. Fine grinding paste should be all you need.
clean all the grinding paste off, grease the female and male parts with waterproof grease and reassemble.
Replace top plate and nuts tightening down until there is just a little resistance on the valve turning, it needs be hardly anything.
Once back in the water, just check operation and that there is no weeping, if there is just operate the valve a few times to smear the grease better and tighten the nuts a little more.
Occasional movement of the handles is all that is required to keep them serviceable, regrease each year when boat is hauled out.
Cone valves are great, easily maintained, pretty much bullet proof. As Frank says, twin clipping can be difficult, they were designed before this was standard and have relatively short spigots, especially the smaller valves.
Gate valves are generally a bad idea on boats, you can't tell if the gate is still attached to the shaft. The handle might turn but the gate might stay closed.
Stainless ball valves are the in thing nowadays.
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