Re: Stus-List Vented loop for engine above exhaust elbow?

[Rick Brass via CnC-List]

Patrick;

 

The PO installed the new Universal M35B using the basic exhaust elbow available 
from Westerbeke instead of a riser, which put the high point of the exhaust 6 
to 8 inches above the waterline, to port of the centerline of the boat. Because 
of the geography aft of the engine on a 38 MK2, the horizontal Hydra Hush 
muffler was installed on the starboard side of the transmission, near the 
waterline. That gave an angle of 30 degrees or less from horizontal to the hose 
that crossed from the exhaust elbow to the muffler (behind the heat exchanger). 
Aft of the muffler the 2” hose from the exhaust was reduced to the original 1 
½” hose used on the original A4 (increasing back pressure and probably 
resulting in more water staying in the muffler) and the hose was just laid in 
the bilge on the way back to the original 1 ½” through hull in the transom – 
maybe 8” to 10” above the water line and less so when the boat squatted under 
power. 

 

So the high point of the system was pretty much the exhaust through hull and 
the hose was undersized, but apparently adequate. When under power the exhaust 
sprayed out of the through hull like a rooster tail; I corrected that with a 
rubber elbow that redirected the spray downward, but didn’t really think about 
why it was happening. 

 

In retrospect, when the engine was shut off all the water in the hose aft of 
the muffler drained back into the muffler. Then when sailing with high port 
heel, the water drained back from the muffler to the exhaust manifold. So long 
as I started the engine after sailing (which is normal) the exhaust pressure 
cleared the water out of the manifold. That arrangement worked for 5 years and 
about 400 engine hours, until I put the boat into a slip without the engine, 
and left it sit for a couple of months. That let the water in the manifold seep 
into the cylinders and rust the rings to the cylinder walls.

 

The replacement system is what Westerbeke/Universal recommends in the 
installation manual – and a bit more when space permitted. After 9 years and 
about 900 hours no problems so far – and I don’t need to put up with the 
rooster tail getting the cockpit wet when motoring downwind.

 

Rick Brass

Washington, NC

 

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Patrick 
Davin via CnC-List
Sent: Tuesday, January 30, 2018 3:54 PM
To: cnc-list@cnc-list.com
Cc: Patrick Davin <jda...@gmail.com>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

 

Rick, that's the sort of nightmare story I'm hoping to avoid! When you say 
corners were cut "on the exhaust elbow, hose routing, and the siphon break" do 
you mean the prior engine had those things installed in a poor manner, or that 
a siphon break wasn't installed? 

 

 

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Re: Stus-List Vented loop for engine above exhaust elbow?

[Daniel Cormier via CnC-List]

Breakaweigh has a vented loop. Yanmar engine.

Dan
Breakaweigh
C
Halifax NS

Sent from my iPhone

> On Jan 30, 2018, at 4:53 PM, Patrick Davin via CnC-List 
>  wrote:
> 
> Thanks all. Rick, that's the sort of nightmare story I'm hoping to avoid! 
> When you say corners were cut "on the exhaust elbow, hose routing, and the 
> siphon break" do you mean the prior engine had those things installed in a 
> poor manner, or that a siphon break wasn't installed? 
> 
> I haven't heard from any Landfall 38 owners about layout (where the loop is 
> mounted), so if any of those folks have one I'd still be interested in that. 
> 
> I did wonder about temperature. I think the exchanger raw water output is not 
> as hot as the exhaust? Forespar says Marelon is okay to 170F. Interestingly 
> the Scot loop says 140 F max temp, which is pretty low. Maybe because their 
> vent parts are made out of plastic Delrin, or they're just being 
> conservative. In the diagram Paul sent me they show the loop in use between 
> the exchanger and exhaust elbow, so obviously they intend for it to be used 
> in that role. 
> 
> I guess most people do the loop between the exchanger outlet and the exhaust 
> elbow because it's easier to install there than in between the water pump and 
> the exchanger inlet. And presuming the water is below 170F then Marelon is 
> okay in either location. 
> 
> I agree the exhaust transom exit is probably the greater risk in most cases. 
> I already have an ample exhaust hose rise there though, and the waterlock 
> muffler should prevent siphoning afaik. It'd take a lot for following waves 
> to push past a 3 foot rise in a 1.5" hose and then through an exhaust riser. 
> I'd consider an exhaust lock (inline, in an accessible location) if I'm 
> worried about that. Hanging from the transom in ocean swells to insert a plug 
> doesn't seem viable. 
> 
> -Patrick
> '84 C LF38
> 
> ___
> 
> Thanks everyone for supporting this list with your contributions.  Each and 
> every one is greatly appreciated.  If you want to support the list - use 
> PayPal to send contribution --   https://www.paypal.me/stumurray
> 
___

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Re: Stus-List Vented loop for engine above exhaust elbow?

[Patrick Davin via CnC-List]

Thanks all. Rick, that's the sort of nightmare story I'm hoping to avoid!
When you say corners were cut "on the exhaust elbow, hose routing, and the
siphon break" do you mean the prior engine had those things installed in a
poor manner, or that a siphon break wasn't installed?

I haven't heard from any Landfall 38 owners about layout (where the loop is
mounted), so if any of those folks have one I'd still be interested in
that.

I did wonder about temperature. I think the exchanger raw water output is
not as hot as the exhaust? Forespar says Marelon is okay to 170F.
Interestingly the Scot loop says 140 F max temp, which is pretty low. Maybe
because their vent parts are made out of plastic Delrin, or they're just
being conservative. In the diagram Paul sent me they show the loop in use
between the exchanger and exhaust elbow, so obviously they intend for it to
be used in that role.

I guess most people do the loop between the exchanger outlet and the
exhaust elbow because it's easier to install there than in between the
water pump and the exchanger inlet. And presuming the water is below 170F
then Marelon is okay in either location.

I agree the exhaust transom exit is probably the greater risk in most
cases. I already have an ample exhaust hose rise there though, and the
waterlock muffler should prevent siphoning afaik. It'd take a lot for
following waves to push past a 3 foot rise in a 1.5" hose and then through
an exhaust riser. I'd consider an exhaust lock (inline, in an accessible
location) if I'm worried about that. Hanging from the transom in ocean
swells to insert a plug doesn't seem viable.

-Patrick
'84 C LF38
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Re: Stus-List Vented loop for engine above exhaust elbow?

[Marek Dziedzic via CnC-List]

Joe,

you must have had a really good starter motor. When I managed to hydro lock my 
engine, it would not turn. Period.

Marek


From: Della Barba, Joe via CnC-List
Sent: Tuesday, January 30, 2018 12:01
To: cnc-list@cnc-list.com
Cc: Della Barba, Joe
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

I started a diesel generator that got water up the exhaust. Put a rod through 
the block.
An A4 just won’t start, the compression is too low to wreck the engine 
(usually). Fresh or salt does not matter.

Joe
Coquina
C 35 MK I


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Re: Stus-List Vented loop for engine above exhaust elbow?

[Della Barba, Joe via CnC-List]

I started a diesel generator that got water up the exhaust. Put a rod through 
the block.
An A4 just won’t start, the compression is too low to wreck the engine 
(usually). Fresh or salt does not matter.

Joe
Coquina
C 35 MK I

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Marek 
Dziedzic via CnC-List
Sent: Tuesday, January 30, 2018 11:55 AM
To: cnc-list@cnc-list.com
Cc: Marek Dziedzic <dziedzi...@hotmail.com>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

The bang is as good as a valve (as long as it stays there).

Personal experience says that the hydro lock (with fresh water) in a diesel is 
not fatal. Might be somewhat different with sea water. Or if you let it stay 
there for a while.

Also clearing the water from a gas engine is simple (spar plugs); in a diesel 
you pray for the glow plugs (much easier to remove than injectors).

Marek

From: Della Barba, Joe via CnC-List
Sent: Tuesday, January 30, 2018 10:37
To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>
Cc: Della Barba, Joe
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

Or you can shove a bung in from the outside on a string ;) Our original huge 
Onan waterlift never flooded the engine despite some extreme weather. That 
finally rusted out and the replacement WOULD flood the engine until I installed 
a higher loop. Flooding is a PITA for an A4, but it can well be fatal for a 
diesel.
Joe
Coquina


___

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Re: Stus-List Vented loop for engine above exhaust elbow?

[Marek Dziedzic via CnC-List]

The bang is as good as a valve (as long as it stays there).

Personal experience says that the hydro lock (with fresh water) in a diesel is 
not fatal. Might be somewhat different with sea water. Or if you let it stay 
there for a while.

Also clearing the water from a gas engine is simple (spar plugs); in a diesel 
you pray for the glow plugs (much easier to remove than injectors).

Marek

From: Della Barba, Joe via CnC-List
Sent: Tuesday, January 30, 2018 10:37
To: cnc-list@cnc-list.com
Cc: Della Barba, Joe
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

Or you can shove a bung in from the outside on a string ;) Our original huge 
Onan waterlift never flooded the engine despite some extreme weather. That 
finally rusted out and the replacement WOULD flood the engine until I installed 
a higher loop. Flooding is a PITA for an A4, but it can well be fatal for a 
diesel.
Joe
Coquina


___

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Re: Stus-List Vented loop for engine above exhaust elbow?

[Della Barba, Joe via CnC-List]

You don’t actually need a check valve either. I know people who use a manual 
valve and run an extra hose all the way out of a thru-hull fitting. They adjust 
it for enough water flow to be visible like an outboard engine.

Joe
Coquina
C 35 MK I

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Dreuge via 
CnC-List
Sent: Tuesday, January 30, 2018 11:41 AM
To: cnc-list@cnc-list.com
Cc: Dreuge <dre...@gmail.com>; Patrick Davin <jda...@gmail.com>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

Patrick,

Maine Sail, the guy from marinehowto.com<http://marinehowto.com>, recommends “ 
siphon breaks from the Scot Pump Company to be among the most reliable and 
trouble free of any I have used or worked on.”

The Scott siphon break uses a stainless loop with the Westerbeke anti siphon 
valve made by MMD Powerline part # MMDW-44438.
See: http://www.scotpump.com/#marketmarine

http://www.betamarinenc.com/product/anti-syphon-valve/


On another note, while most wet exhaust vented loops are installed just before 
the exhaust mixing elbow, I have been told that a vented loop can(and should) 
be installed after the raw water pump and before the intake to the heat 
exchanger or engine.  This way, the vented loop works with ambient temperature 
sea water and not engine heated hot sea water.



-
Paul E.
1981 C 38 Landfall
S/V Johanna Rose
Fort Walton Beach, FL

http://svjohannarose.blogspot.com/


On Jan 29, 2018, at 7:38 PM, 
cnc-list-requ...@cnc-list.com<mailto:cnc-list-requ...@cnc-list.com> wrote:

Date: Mon, 29 Jan 2018 12:50:39 -0800
From: Patrick Davin <jda...@gmail.com<mailto:jda...@gmail.com>>
To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?
Message-ID:

<cahixy6rfql-arl4u5edbtpmtyn-_0uuoosupf4dlo6tbnz6...@mail.gmail.com<mailto:cahixy6rfql-arl4u5edbtpmtyn-_0uuoosupf4dlo6tbnz6...@mail.gmail.com>>
Content-Type: text/plain; charset="utf-8"

For those that have one, do you know what kind you have?  Vetus makes a few
- https://www.google.com/search?q=vetus+vented+loop - and there are the
Forespar Marelon ones. I read some of the Vetus ones require running a vent
line overboard or to a cockpit drain, or they leak water into the boat.

Also where do you have it mounted / how high?  My mechanic suggested
mounting it as high as possible, which means running it up into the stbd
lazarette. I'm hesistant about that because our lazarette is jam packed
full while cruising (it's our only large storage space).

___

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every one is greatly appreciated.  If you want to support the list - use PayPal 
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Re: Stus-List Vented loop for engine above exhaust elbow?

[Dreuge via CnC-List]

Patrick,

Maine Sail, the guy from marinehowto.com <http://marinehowto.com/>, recommends 
“ siphon breaks from the Scot Pump Company to be among the most reliable and 
trouble free of any I have used or worked on.”

The Scott siphon break uses a stainless loop with the Westerbeke anti siphon 
valve made by MMD Powerline part # MMDW-44438.  
See: http://www.scotpump.com/#marketmarine 
<http://www.scotpump.com/#marketmarine>

http://www.betamarinenc.com/product/anti-syphon-valve/ 
<http://www.betamarinenc.com/product/anti-syphon-valve/>


On another note, while most wet exhaust vented loops are installed just before 
the exhaust mixing elbow, I have been told that a vented loop can(and should) 
be installed after the raw water pump and before the intake to the heat 
exchanger or engine.  This way, the vented loop works with ambient temperature 
sea water and not engine heated hot sea water.  



-
Paul E.
1981 C 38 Landfall 
S/V Johanna Rose
Fort Walton Beach, FL

http://svjohannarose.blogspot.com/

> On Jan 29, 2018, at 7:38 PM, cnc-list-requ...@cnc-list.com wrote:
> 
> Date: Mon, 29 Jan 2018 12:50:39 -0800
> From: Patrick Davin <jda...@gmail.com <mailto:jda...@gmail.com>>
> To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>
> Subject: Re: Stus-List Vented loop for engine above exhaust elbow?
> Message-ID:
>   <cahixy6rfql-arl4u5edbtpmtyn-_0uuoosupf4dlo6tbnz6...@mail.gmail.com 
> <mailto:cahixy6rfql-arl4u5edbtpmtyn-_0uuoosupf4dlo6tbnz6...@mail.gmail.com>>
> Content-Type: text/plain; charset="utf-8"
> 
> For those that have one, do you know what kind you have?  Vetus makes a few
> - https://www.google.com/search?q=vetus+vented+loop 
> <https://www.google.com/search?q=vetus+vented+loop> - and there are the
> Forespar Marelon ones. I read some of the Vetus ones require running a vent
> line overboard or to a cockpit drain, or they leak water into the boat.
> 
> Also where do you have it mounted / how high?  My mechanic suggested
> mounting it as high as possible, which means running it up into the stbd
> lazarette. I'm hesistant about that because our lazarette is jam packed
> full while cruising (it's our only large storage space).

___

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every one is greatly appreciated.  If you want to support the list - use PayPal 
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Re: Stus-List Vented loop for engine above exhaust elbow?

[Della Barba, Joe via CnC-List]

Or you can shove a bung in from the outside on a string ;) Our original huge 
Onan waterlift never flooded the engine despite some extreme weather. That 
finally rusted out and the replacement WOULD flood the engine until I installed 
a higher loop. Flooding is a PITA for an A4, but it can well be fatal for a 
diesel.
Joe
Coquina

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Marek 
Dziedzic via CnC-List
Sent: Tuesday, January 30, 2018 9:01 AM
To: cnc-list@cnc-list.com
Cc: Marek Dziedzic <dziedzi...@hotmail.com>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

I have read ( I haven’t seen it personally) that if you are sailing for long 
periods in following seas (e.g. ocean crossings), you may want to have a shut 
off valve installed on the exhaust hose. Some people reported that despite the 
high point in the hose, the sea water eventually filled up the muffler and then 
made its way into the cylinders causing a water (hydro) lock. Not a fun task to 
do when you are approaching your destination.

Marek

From: Rick Brass via CnC-List
Sent: Monday, January 29, 2018 20:04
To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>
Cc: Rick Brass
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?


And,, BTW, I don’t see the raw water line into the exhaust elbow as the most 
likely source of siphoning water into the exhaust manifold. More likely water 
from the  hose and muffler. Again, Westerbeke/Universal recommends that the 
hose between muffler and outlet have a high point at least 18” above the 
waterline (and that the high point be near the transom to prevent following 
waves from filling up the exhaust system). My high point is about 24” up (in 
the starboard lazarette) just above the muffler and then slopes down and aft to 
an exit under the break of the transom and 6” above the waterline.

Rick Brass
Washington, NC



From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Patrick 
Davin via CnC-List
Sent: Monday, January 29, 2018 3:51 PM
To: cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>
Cc: Patrick Davin <jda...@gmail.com<mailto:jda...@gmail.com>>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

For those that have one, do you know what kind you have?  Vetus makes a few - 
https://www.google.com/search?q=vetus+vented+loop<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Dvetus%2Bvented%2Bloop=02%7C01%7C%7C5e818bdb18e14e2f43ba08d5677d6bb0%7C84df9e7fe9f640afb435%7C1%7C0%7C636528710724185314=hr2byCd2EFJt7xyMKMxp7e8biuKIn%2Fsy5VqmbBjfW7g%3D=0>
 - and there are the Forespar Marelon ones. I read some of the Vetus ones 
require running a vent line overboard or to a cockpit drain, or they leak water 
into the boat.

Also where do you have it mounted / how high?  My mechanic suggested mounting 
it as high as possible, which means running it up into the stbd lazarette. I'm 
hesistant about that because our lazarette is jam packed full while cruising 
(it's our only large storage space).
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Marek Dziedzic via CnC-List]

I have read ( I haven’t seen it personally) that if you are sailing for long 
periods in following seas (e.g. ocean crossings), you may want to have a shut 
off valve installed on the exhaust hose. Some people reported that despite the 
high point in the hose, the sea water eventually filled up the muffler and then 
made its way into the cylinders causing a water (hydro) lock. Not a fun task to 
do when you are approaching your destination.

Marek

From: Rick Brass via CnC-List
Sent: Monday, January 29, 2018 20:04
To: cnc-list@cnc-list.com
Cc: Rick Brass
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?


And,, BTW, I don’t see the raw water line into the exhaust elbow as the most 
likely source of siphoning water into the exhaust manifold. More likely water 
from the  hose and muffler. Again, Westerbeke/Universal recommends that the 
hose between muffler and outlet have a high point at least 18” above the 
waterline (and that the high point be near the transom to prevent following 
waves from filling up the exhaust system). My high point is about 24” up (in 
the starboard lazarette) just above the muffler and then slopes down and aft to 
an exit under the break of the transom and 6” above the waterline.

Rick Brass
Washington, NC



From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Patrick 
Davin via CnC-List
Sent: Monday, January 29, 2018 3:51 PM
To: cnc-list@cnc-list.com
Cc: Patrick Davin <jda...@gmail.com>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

For those that have one, do you know what kind you have?  Vetus makes a few - 
https://www.google.com/search?q=vetus+vented+loop<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Dvetus%2Bvented%2Bloop=02%7C01%7C%7C5e818bdb18e14e2f43ba08d5677d6bb0%7C84df9e7fe9f640afb435%7C1%7C0%7C636528710724185314=hr2byCd2EFJt7xyMKMxp7e8biuKIn%2Fsy5VqmbBjfW7g%3D=0>
 - and there are the Forespar Marelon ones. I read some of the Vetus ones 
require running a vent line overboard or to a cockpit drain, or they leak water 
into the boat.

Also where do you have it mounted / how high?  My mechanic suggested mounting 
it as high as possible, which means running it up into the stbd lazarette. I'm 
hesistant about that because our lazarette is jam packed full while cruising 
(it's our only large storage space).
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Rick Brass via CnC-List]

Imzadi has a bronze Groco siphon break installed. The PO had saved around $400, 
when converting from the original A4 to the Universal diesel, by cutting 
corners on the exhaust elbow, hose routing, and the siphon break. Worked fine 
for 7 years and about 600 hours. Then I came in from sailing without starting 
the engine and the seawater that had siphoned into the exhaust manifold weeped 
into the cylinders and froze the rings to the cylinder walls.

 

When replacing the now useless engine, I decided to follow the installation 
instructions this time. Westerbeke/Universal calls for a siphon break between 
the heat exchanger and exhaust elbow, mounted at least 18” above the water 
line. 

 

Because it is between the heat exchanger and elbow, it is pretty much on the 
centerline of the boat, and mine is attached to the bulkhead at the back of the 
engine compartment on the 38 mk2. 

 

And,, BTW, I don’t see the raw water line into the exhaust elbow as the most 
likely source of siphoning water into the exhaust manifold. More likely water 
from the  hose and muffler. Again, Westerbeke/Universal recommends that the 
hose between muffler and outlet have a high point at least 18” above the 
waterline (and that the high point be near the transom to prevent following 
waves from filling up the exhaust system). My high point is about 24” up (in 
the starboard lazarette) just above the muffler and then slopes down and aft to 
an exit under the break of the transom and 6” above the waterline.

 

Rick Brass

Washington, NC

 

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Patrick 
Davin via CnC-List
Sent: Monday, January 29, 2018 3:51 PM
To: cnc-list@cnc-list.com
Cc: Patrick Davin <jda...@gmail.com>
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?

 

For those that have one, do you know what kind you have?  Vetus makes a few - 
https://www.google.com/search?q=vetus+vented+loop - and there are the Forespar 
Marelon ones. I read some of the Vetus ones require running a vent line 
overboard or to a cockpit drain, or they leak water into the boat.

 

Also where do you have it mounted / how high?  My mechanic suggested mounting 
it as high as possible, which means running it up into the stbd lazarette. I'm 
hesistant about that because our lazarette is jam packed full while cruising 
(it's our only large storage space). 

___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Patrick Davin via CnC-List]

For those that have one, do you know what kind you have?  Vetus makes a few
- https://www.google.com/search?q=vetus+vented+loop - and there are the
Forespar Marelon ones. I read some of the Vetus ones require running a vent
line overboard or to a cockpit drain, or they leak water into the boat.

Also where do you have it mounted / how high?  My mechanic suggested
mounting it as high as possible, which means running it up into the stbd
lazarette. I'm hesistant about that because our lazarette is jam packed
full while cruising (it's our only large storage space).
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Jack Fitzgerald via CnC-List]

Honey has one as well.

Best regards,
Jack Fitzgerald
HONEY
C 39 TM - US12788
Savannah, GA 31410 USA

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On Mon, Jan 29, 2018 at 2:51 PM, Dennis C. via CnC-List <
cnc-list@cnc-list.com> wrote:

> Touche' has one.
>
> Dennis C.
> Touche' 35-1 #83
> Mandeville, LA
>
> On Jan 29, 2018 11:29 AM, "Patrick Davin via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
>> Does anyone have a vented loop on their engine cooling water hose
>> (between the heat exchanger and the exhaust elbow)?  Do you think it's
>> necessary, and any regrets / things you would change? If you have one,
>> where is it mounted? (particularly for LF38 layout, but any C over 32'
>> would probably be relevant)
>>
>> I searched the archives for previous discussion of this but couldn't find
>> anything.  A diesel mechanic I'm having work on the engine (Yanmar 3HMF)
>> recommended a vented loop as a precautionary / extra-careful measure. Our
>> exhaust elbow is a few feet above waterline, and I'm skeptical we could
>> ever be heeled enough to bring it below heeled waterline (we've had the
>> toerail in the water before, and afaik the boat has never had a waterlock
>> issue). But I see his point about it maybe being cheap insurance against a
>> big problem.
>>
>> Background: a vented loop is sometimes installed between the heat
>> exchanger and the exhaust elbow to prevent water in the hose from siphoning
>> into the engine, resulting in hydrolock or worse (engine being ruined). It
>> has nothing to do with the exhaust hose exiting the boat (past the exhaust
>> riser). The need for it is determined by whether the exhaust elbow can be
>> below heeled waterline or not. Opinions on the Internet diverge (some
>> people think they're necessary, some don't). So I'm interested in what C
>> folks have since this is very specific to engine layout.
>>
>> -Patrick
>> 1984 C LF38
>>
>>
>> ___
>>
>> Thanks everyone for supporting this list with your contributions.  Each
>> and every one is greatly appreciated.  If you want to support the list -
>> use PayPal to send contribution --   https://www.paypal.me/stumurray
>>
>>
>>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
>
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Dennis C. via CnC-List]

Touche' has one.

Dennis C.
Touche' 35-1 #83
Mandeville, LA

On Jan 29, 2018 11:29 AM, "Patrick Davin via CnC-List" <
cnc-list@cnc-list.com> wrote:

> Does anyone have a vented loop on their engine cooling water hose (between
> the heat exchanger and the exhaust elbow)?  Do you think it's necessary,
> and any regrets / things you would change? If you have one, where is it
> mounted? (particularly for LF38 layout, but any C over 32' would probably
> be relevant)
>
> I searched the archives for previous discussion of this but couldn't find
> anything.  A diesel mechanic I'm having work on the engine (Yanmar 3HMF)
> recommended a vented loop as a precautionary / extra-careful measure. Our
> exhaust elbow is a few feet above waterline, and I'm skeptical we could
> ever be heeled enough to bring it below heeled waterline (we've had the
> toerail in the water before, and afaik the boat has never had a waterlock
> issue). But I see his point about it maybe being cheap insurance against a
> big problem.
>
> Background: a vented loop is sometimes installed between the heat
> exchanger and the exhaust elbow to prevent water in the hose from siphoning
> into the engine, resulting in hydrolock or worse (engine being ruined). It
> has nothing to do with the exhaust hose exiting the boat (past the exhaust
> riser). The need for it is determined by whether the exhaust elbow can be
> below heeled waterline or not. Opinions on the Internet diverge (some
> people think they're necessary, some don't). So I'm interested in what C
> folks have since this is very specific to engine layout.
>
> -Patrick
> 1984 C LF38
>
>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
>
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Della Barba, Joe via CnC-List]

I have one. It has caused no problems and could prevent a siphon. They should 
be checked every now and then for proper operation. They should not leak water 
out and should allow air in.
Joe
Coquina
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Andrew Burton via CnC-List]

The mechanic put one on my new installation on Peregrine. He said he
thought that we were a little close to the water line, so better safe than
sorry. By the way, Cruising World at some point will be coming out with my
article on taking out the old and installing the new engine.

Andy
Formerly C 40 Peregrine
Now Baltic 47 Fair Wind

On Mon, Jan 29, 2018 at 1:37 PM, Josh Muckley via CnC-List <
cnc-list@cnc-list.com> wrote:

> I have one from the PO.  No regrets and no plans on removing it.  I think
> it is probably cheap insurance.  I've come across precautionary tails of
> the vent becoming plugged closed or degrading open.  Just be aware.
>
> Josh Muckley
> S/V Sea Hawk
> 1989 C 37+
> Solomons, MD
>
> On Mon, Jan 29, 2018, 1:29 PM Patrick Davin via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
>> Does anyone have a vented loop on their engine cooling water hose
>> (between the heat exchanger and the exhaust elbow)?  Do you think it's
>> necessary, and any regrets / things you would change? If you have one,
>> where is it mounted? (particularly for LF38 layout, but any C over 32'
>> would probably be relevant)
>>
>> I searched the archives for previous discussion of this but couldn't find
>> anything.  A diesel mechanic I'm having work on the engine (Yanmar 3HMF)
>> recommended a vented loop as a precautionary / extra-careful measure. Our
>> exhaust elbow is a few feet above waterline, and I'm skeptical we could
>> ever be heeled enough to bring it below heeled waterline (we've had the
>> toerail in the water before, and afaik the boat has never had a waterlock
>> issue). But I see his point about it maybe being cheap insurance against a
>> big problem.
>>
>> Background: a vented loop is sometimes installed between the heat
>> exchanger and the exhaust elbow to prevent water in the hose from siphoning
>> into the engine, resulting in hydrolock or worse (engine being ruined). It
>> has nothing to do with the exhaust hose exiting the boat (past the exhaust
>> riser). The need for it is determined by whether the exhaust elbow can be
>> below heeled waterline or not. Opinions on the Internet diverge (some
>> people think they're necessary, some don't). So I'm interested in what C
>> folks have since this is very specific to engine layout.
>>
>> -Patrick
>> 1984 C LF38
>>
>> ___
>>
>> Thanks everyone for supporting this list with your contributions.  Each
>> and every one is greatly appreciated.  If you want to support the list -
>> use PayPal to send contribution --   https://www.paypal.me/stumurray
>>
>>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
>


-- 
Andrew Burton
61 W Narragansett Ave
Newport, RI
USA 02840
http://sites.google.com/site/andrewburtonyachtservices/
phone  +401 965 5260
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Re: Stus-List Vented loop for engine above exhaust elbow?

[Josh Muckley via CnC-List]

I have one from the PO.  No regrets and no plans on removing it.  I think
it is probably cheap insurance.  I've come across precautionary tails of
the vent becoming plugged closed or degrading open.  Just be aware.

Josh Muckley
S/V Sea Hawk
1989 C 37+
Solomons, MD

On Mon, Jan 29, 2018, 1:29 PM Patrick Davin via CnC-List <
cnc-list@cnc-list.com> wrote:

> Does anyone have a vented loop on their engine cooling water hose (between
> the heat exchanger and the exhaust elbow)?  Do you think it's necessary,
> and any regrets / things you would change? If you have one, where is it
> mounted? (particularly for LF38 layout, but any C over 32' would probably
> be relevant)
>
> I searched the archives for previous discussion of this but couldn't find
> anything.  A diesel mechanic I'm having work on the engine (Yanmar 3HMF)
> recommended a vented loop as a precautionary / extra-careful measure. Our
> exhaust elbow is a few feet above waterline, and I'm skeptical we could
> ever be heeled enough to bring it below heeled waterline (we've had the
> toerail in the water before, and afaik the boat has never had a waterlock
> issue). But I see his point about it maybe being cheap insurance against a
> big problem.
>
> Background: a vented loop is sometimes installed between the heat
> exchanger and the exhaust elbow to prevent water in the hose from siphoning
> into the engine, resulting in hydrolock or worse (engine being ruined). It
> has nothing to do with the exhaust hose exiting the boat (past the exhaust
> riser). The need for it is determined by whether the exhaust elbow can be
> below heeled waterline or not. Opinions on the Internet diverge (some
> people think they're necessary, some don't). So I'm interested in what C
> folks have since this is very specific to engine layout.
>
> -Patrick
> 1984 C LF38
>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray

Stus-List Vented loop for engine above exhaust elbow?

[Patrick Davin via CnC-List]

Does anyone have a vented loop on their engine cooling water hose (between
the heat exchanger and the exhaust elbow)?  Do you think it's necessary,
and any regrets / things you would change? If you have one, where is it
mounted? (particularly for LF38 layout, but any C over 32' would probably
be relevant)

I searched the archives for previous discussion of this but couldn't find
anything.  A diesel mechanic I'm having work on the engine (Yanmar 3HMF)
recommended a vented loop as a precautionary / extra-careful measure. Our
exhaust elbow is a few feet above waterline, and I'm skeptical we could
ever be heeled enough to bring it below heeled waterline (we've had the
toerail in the water before, and afaik the boat has never had a waterlock
issue). But I see his point about it maybe being cheap insurance against a
big problem.

Background: a vented loop is sometimes installed between the heat exchanger
and the exhaust elbow to prevent water in the hose from siphoning into the
engine, resulting in hydrolock or worse (engine being ruined). It has
nothing to do with the exhaust hose exiting the boat (past the exhaust
riser). The need for it is determined by whether the exhaust elbow can be
below heeled waterline or not. Opinions on the Internet diverge (some
people think they're necessary, some don't). So I'm interested in what C
folks have since this is very specific to engine layout.

-Patrick
1984 C LF38
___

Thanks everyone for supporting this list with your contributions.  Each and 
every one is greatly appreciated.  If you want to support the list - use PayPal 
to send contribution --   https://www.paypal.me/stumurray