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Author Topic: Exhaust Water Lock
djc
Owner
Posts: 19
Post Exhaust Water Lock
on: March 9, 2011, 10:36

I am in the process of replacing my exhaust hoses and noticed theres no water lock fitted to my exhaust system . It seems to be ok never had problems with sea water back feeding into engine yet .
System as follows : Yanmar engine , port side exhaust manifold through a s/s riser about 1 ft high . sea water up a syphon break port side . Down again . The 3" ID exhaust hose then comes down through the central bilge bulk head area along over the prop shaft and shaft seal then turns up through the bottom of aft cabin wardrobe in to aft locker and up over a large curve forming the gooseneck, then out via the hull exhaust fitting.
Just wondered about other peoples thoughts and set ups.

David Coxon . Bardolino . Gosport .

AE
Owner
Posts: 7
Post Re: Exhaust Water Lock
on: March 22, 2011, 10:19

Hi David, I have a waterlock as well as a swan neck and always give the engine a burst of revs before stopping it - to blow as much water out of the exhaust pipe as I can. Lots of good info on exhausts on the Vetus Catalogue and Halyard web sites: -
http://viewer.zmags.com/publication/dde28f6a#/dde28f6a/64

http://www.halyard.eu.com/Knowledge/exhaust_configurations.html

Owner, with Jane Robinson, of 1972 Barbary Ketch, Barbary Rose. Keep her at Brightlingsea, in Essex. - Former names were "Gay Constance II" !!! and "Mere Idea"

djc
Owner
Posts: 19
Post Re: Exhaust Water Lock
on: March 22, 2011, 15:51

Hi Adrian , Thanks for more interesting info . I did wonder if it was possible to fit a water lock in the barbary system but you have proved it can be done . Would be curious to know what type it was and where you sited it.
I havent come across the halyard site before nice find. If only our yachts had the space their diagrams suggest to fit the stuff .
I can see where the exhaust pipe was originally run , when the merc engine was fitted , before my ownership , i would say it was from the starboard side exhaust riser up the starboard inside of engine bay bulk head through bulkhead then back down underneath the starboard berth ,under wardrobe , aft locker etc. I would say it never had a water lock fitted ? . Trouble is my yanmar has a port side manifold opposite to the merc. And the exhaust hose now has been routed down through the centre of bilge, so it relies on the exhaust riser on engine and the goose neck at transom and depth of bilge to do the job , so water held down in bilge area ? ,have left the Elastomuffle off for time being. Still thinking on it.

PS , current arangement seems to have worked for the last 10 years although not been out in gale force conditions .

PPS, Not possible to route exhaust hose through port side due to main battery box in the way. Or enough space behind engine to fit a water lock as it would take up to much space . My conclusion is keep an eye /monitor it or could get a further 4" height welded to riser if required ...

David Coxon . Bardolino . Gosport .

djc
Owner
Posts: 19
Post Re: Exhaust Water Lock
on: April 16, 2011, 13:05

I would still be interested to know if any one else has a water lock fitted in their exhaust system , if so where its installed and what type it is ? . Or do most of us rely on the way our exhaust hoses are routed to do the job ? .

Thanks David.

David Coxon . Bardolino . Gosport .

admin
Administrator
Posts: 20
Post Re: Exhaust Water Lock
on: April 17, 2011, 11:51

I have the original OM 636 engine with the exhaust running exactly as David describes on starboard side. Don't think I have a water lock but my boat is out of the water at the moment for a few days for an insurance survey and while the surveyor was looking at her he noticed that there is a tube emerging from the propshaft tunnel aft of the stern gland which rises into the cockpit locker behind the helm. It is at least 25mm in diameter and of clear polythene. The end is open and supported high up in the locker. I am not, of course, talking about the greasing tube which runs parallel to it in places.
Does anyone know what this is for???

Alan Ellicott - Site Administrator
Also ex-owner ( with Carole) of Barbary Spirit
see http://www.barbaryspirit.co.uk

djc
Owner
Posts: 19
Post Re: Exhaust Water Lock
on: April 19, 2011, 07:48

Thanks for that .
Re Water Lock .
I thought thats how the standard exhaust routing may have been done ,so the water was kind of trapped under the starboard berth locker area i guess . I will conduct some tests on my exhaust hose set up and routing when i am a float again , if i find the water is not trapped down in rear bilge exhaust hose area enough , i will have to think of some other idea .

Re Hose from rear of stern tube .
I havent got the standard barbary stern tube set up . But i think it is the hose that was used to lubricate the cutlass bearing which would have been teed off the engine or exhaust riser and connected to stern tube to lubricate the cutlass bearing . And i would say the hose has been disconected from your engine and is just used as a air vent now , ie same job as my PSS shaft seal vent pipe , open ended hose fixed high up above water line in my locker . Thats what it sounds like to me ? .

David Coxon . Bardolino . Gosport .

nkilp
Owner
Posts: 2
Post Re: Exhaust Water Lock
on: May 23, 2011, 18:30

Re hose from stern tube. Yes, ours is probably the original set-up; the cutless bearing is water lubricated from the cooling water, so, if when out of the water we test the engine (with the intake hose in a bucket) water squirts out around the shaft as well as out with the exhaust. Can't remember where the 2cm approx. black rubber pipe is teed in, but will check next time I am aboard.

Norman Kilpatrick. Barbeta. Poole

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