Exhaust Routing - will it cause a problem?

[RobW]

Hi all
Can anyone advise - I am in the process of replacing the exhaust hose on our sailing cruiser, after discovering a couple of badly delaminated points on the old hose.

We have a very standard system, mixing elbow, short bit of hose, watertrap, longer length of hose forming a high loop / gooseneck in the aft locker, dropping to a through transom outlet above the waterline.

I thought I was being clever and recently acquired a second hand / hardly used vetus type gooseneck thinking I could save some hose and space in the back locker, however there is not quite the height I though, and if I install this, there will be a rise in the pipe from the gooseneck outlet in the short length of hose to the transom outlet, so it would always retain a small amout of water at this point, were previously it would have been self draining.

Does this matter, or should I retain the original set-up with the loop of hose?

I just have an uneasy feeling that this is less than ideal!
Any advise or experience of similar configurations much appreciated.

Rob.

 

[VicS]

There is no reason why you should not continue to use a hose loop to form the swan neck.

The Vetus units ( "goose neck" they call them) are useful if lack of space makes it difficult to use the hose loop

I am puzzled that you say your Vetus unit will retain some water although I cannot see that a little retained water will matter. Are you sure you are not fitting it upside down? I think you may be!

See the Vetus catalogue. Page 64 et seq.
http://viewer.zmags.com/publication/06fa8bec#/06fa8bec/64


( In my book a goose neck is the joint between the boom to the mast! )

 

[alahol2]

I've always known them as a Swan neck but either way I don't see how a bit of retained water in the last few inches of the exhaust pipe is going to cause any problem.

 

[RobW]

I am puzzled that you say your Vetus unit will retain some water although I cannot see that a little retained water will matter. Are you sure you are not fitting it upside down? I think you may be!

( In my book a goose neck is the joint between the boom to the mast! )

Hi and thanks for your response, but I do have the vetus goose neck the correct way round, they print nice big arrows on the side of the moulding to help with this.

The potential problem, if it is a problem, is the height of my locker (or lack of it) which means that the outlet of the vetus goose neck will be below the existing transom outlet fitting, thus requiring a short "up-hill" section of hose between the vetus goose neck outlent and the transom outlet fitting. Is this a problem?

(With my old set-up, any water remaining in the pipe, after the highest point of the swan neck, would have been self-draining).

I have no idea why Vetus call a swan neck a goose neck!

BW

Robert

 

[Tranona]

Then don't use the Vetus fitting. The loop has to be above the waterline. If it worked OK before then no need for the gooseneck.

 

[biscuit]

I believe that 10% of engine breakdowns derive from sea water getting into the engine from the exhaust, especially yachts, whose mixing elbow is near or below the waterline. Apart from the swan neck/ high loop/ water lock/ exhaust riser solutions, a pal had adopted a habit, just before stopping the engine, of shutting off the water intake, then giving it full revs for a few seconds to blow any residual water out of the exhaust. I tried this in my boat recently,then checked the Vetus water lock (which usually has a pint or two in the bottom), and it was empty: so it does seem to work.....if you can remember to do it.

 

[Rolloh]

Volvo Design Issues, What were They Thinking?

I started doing the same thing, shutting the inlet and running it dry, only takes a few seconds. Not sure how this occurred, this Volvo D2-40 has 352 hours since complete new install. Their very poorly designed water injection plastic pipe into the mixing riser (sealed with an O-Ring) an inch above the exhaust port is another discussion. Hot Salt Water really likes cast Iron. It has eaten under the O-Ring and cross contaminated the fresh water coolant. OH Boy, and it gets Better ! For now, DO NOT BUY A Volvo D2 SERIES (REALLY BAD FLAWS) AND NO SUPPORT!

I believe that 10% of engine breakdowns derive from sea water getting into the engine from the exhaust, especially yachts, whose mixing elbow is near or below the waterline. Apart from the swan neck/ high loop/ water lock/ exhaust riser solutions, a pal had adopted a habit, just before stopping the engine, of shutting off the water intake, then giving it full revs for a few seconds to blow any residual water out of the exhaust. I tried this in my boat recently,then checked the Vetus water lock (which usually has a pint or two in the bottom), and it was empty: so it does seem to work.....if you can remember to do it.