vetus and exhaust discharge below water line

[smeaks]

Further to my recent vetus post, i now understand what the vetus anti siphon does and recognise that mine is leaking a little water. My exhaust discharges below the water line (Moody 27) and therefore I can not easily check for water discharge in the exhaust to check for cooling flow of water through the engine. If the vent on top of the vetus is lead overboard what needs to be done to the vetus to make a tell tale flow appear at the vent? If the tell tale is through hulled well avove the waterline then it would still serve the purpose of an anti siphon but would the evident flow detract sufficiently from the main cooling supple to cause a problem - the vetus is mounted before the engine.

 

[Endeavourquay]

Vetus do two types, type V with a self contained anti-syphon pressure valve, and type H which has a hose conneection which you put through the hull and this one has a constant bleed off of the cooling water, so you can see the tell -tail water stream. Give Vetus a ring and see if its possible to put a tube on yours or if you need to replace it with type H. 01329232360

 

[Tranona]

There is an older Vetus valve which you might have if it has been there for a while. It is blue (or mine is) with a chrome cap. These often leak because the valve inside gets clogged with salt crystals just like the latest version. Unscrew it for cleaning. That type cannot be fitted with a bleed. Looking at the new one in the catalogue, they look to be the same housing, but the top that holds the valve is different because the bleed one presumably does not have the internal pressure valve.

 

[Endeavourquay]

Ah, as you have one already and I am awaiting delivery of mine, you might be able to help on a question I have, the catalog says to position 40 cm above the waterline, and centrally, I dont have 40cm of space above the water line, (Contessa 26) unless I feed it up into the locker on the side of the cockpit, but that wouldnt be central, so would it work being shoved over to the side?

 

[smeaks]

the reason they state centrally is because a sailing bot heels and if it is possible that an offset device may end up below the waterline. If it is high enough i cant see there being a problem. i suppose any position could eventually end up below the water line if heeled sufficiently!

 

[Tranona]

Yes, they are often routed out of the side for practical reasons. Obviously the higher the better, but as the valve itself should be above the heeled water line there should be no chance of water getting back in. Having said that, my boat, like the Contessa has a low freeboard aft of the cabin and that is why I chose not to have the bleed. My exhaust is above the water line and I can hear the water plopping out. I also have a filter on the inlet so that one can check the water flow there.

 

[rogerthebodger]

A point to note is that it is the air inlet that needs to be 40 cm above the waterline so you could fit a spall bore tube between the top of the U -bend (remove the one way valve) and fir it to the end of the small bore tube which can be feed up the side and into the roof space so the valve is central.

If anyone wants a visual tel-tail on the type without the one way valve use a plastic computer flow indicator which has a rotation spider when water flows through it.
Most computer shops will have then. Another way is to lead the pipe to be positioned over the cockpit drain.

 

[VicS]

[ QUOTE ]
what needs to be done to the vetus to make a tell tale flow appear at the vent

[/ QUOTE ] Both V & H types appear to be identical externally and to both have the same provision to attach a tube so all that should be necessary will be to remove the components of the valve.

If it is an older type then provided you can dismantle it to remove its innards and attach a tube to it then the same will apply.

If push comes to shove it is not a major item to change anyway.

If the discharge can be routed to a point just above a cockpit drain it will always be visible but the downside could be the effect it has on your own waterworks.

A totally different approach to checking the cooling water flow is to fit a simple flow indicator in the inlet pipework somewhere.

Exhaust temperature alarm another possibility.

 

[boatmike]

I can confirm that all those with valves will function as a non valve type. HOWEVER
the diameter of the outlet spigot could lead you to fitting a tube that was too big and exhaust too much water over the side. Vetus make a little skin fitting in plastic with about a 1/8" dia hole. fit one of those and take a plastic pipe that fits that back to the anti-syphon device once you have thrown out the stupid valve. I can't count the number of engines I have seen wrecked because these valves stick and don't work! It's a good thing to get rid of the valve entirely.