On Jan 10, 2020, at 6:06 AM, ngtnewington Newington via Groups.Io <ngtnewington@...> wrote:

This is an interesting thread. I am not sure why I hate running the engine at sea unnecessarily, but I do. 

On the 54 the exhaust out from the Vetus muffler is a large rubber hose that rises up to near the level of the cockpit floor, before flowing down to the hull skin fitting. In my opinion this is a good installation and unlikely to allow water to be forced into the engine especially considering the additional flap that will prevent waves from being forced in the exhaust line.

I believe that so long as the boat is actually sailing there will be no problem as the water will be sucked out of the pipework from the flow of water along the hull. This is due to the Bernoulli Principle, (a bit like the Ventouri effect) which is why a self bailing slot in the bottom of a sailing dinghy draws the water out whilst sailing but when stationary lets it in.

I can see that whilst hove to and more or less stationary there could indeed be a situation whereby water works its way into the muffler and then gradually fills up the exhaust outlet between the engine and the muffler. This is the one time when we really do not want to be worried about such a situation.

So in conclusion we need to be either mindful of this potential situation and run the engine or come up with something else.

I like Leslie’s suggestion of running a hose from the muffler drain point to the bilge. This would drain any water that accumulates in the muffler. It would be easy to install and one could test it and see just how much comes in….does anyone see a problem with this idea?

Nick

AML 54-019

Ashore Kilada Greece

On 10 Jan 2020, at 09:35, Alan Leslie <s.v.elyse@...> wrote:

The flap valve is in the exhaust outlet fitting /// you can see it if you swim around the port side, or when you're hauled out.

Cheers
Alan
Elyse SM437

On 10 Jan 2020, at 09:35, Alan Leslie <s.v.elyse@...> wrote:

The flap valve is in the exhaust outlet fitting /// you can see it if you swim around the port side, or when you're hauled out.

Cheers
Alan
Elyse SM437

On 10 January 2020 at 03:23 "karkauai via Groups.Io" <karkauai@...> wrote:

Kristy (SM243) has a stainless steel mixing "box" instead of a Vetus muffler.  Pic attached.  Is there a flap valve here as well?    If not, can one be added to the exhaust hose?  If that's a bad idea, should I be getting a muffler?

Thanks,

Kent and Iris

Palm Beach FL heading to Bahamas and S with the next weather window. 

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On 10 Jan 2020, at 03:23, karkauai via Groups.Io <karkauai@...> wrote:



Kristy (SM243) has a stainless steel mixing "box" instead of a Vetus muffler.  Pic attached.  Is there a flap valve here as well?    If not, can one be added to the exhaust hose?  If that's a bad idea, should I be getting a muffler?

Thanks,

Kent and Iris

Palm Beach FL heading to Bahamas and S with the next weather window. 

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<IMG_20200109_091641_1.jpg>

On 7 Jan 2020, at 15:22, Scott SV Tengah <Scott.nguyen@...> wrote:

Given the spate of failed Volvo D3-110 engines and more than a few with seawater found in the cylinders, I am inclined to believe that there is a design weakness in the exhaust system on A54s. I do not know if the exhaust system is significantly different on the SM and other prior models but it does seem we only hear of flooded A54 engines.

In any event, I read the following in my manual and at least two other A54 owners had never heard this advice:

"You must run the main engine everyday of sailing for 15 or 20 minutes (in 1 or 2 times) to drain the exhaust circuit from the seawater the waves that fill in it."

Am I the only one who does this?
--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com

<Engine Warning Volvo D3-110.pdf>

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From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Arno Luijten
Sent: 07 January 2020 13:12
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Windsreen replacement

Hi Paul,

Last spring I got an offer to have them replaced for a little over 900 euro by:

From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of Scott SV Tengah
Sent: 07 January 2020 12:18
To: main@AmelYachtOwners.groups.io
Subject: Re: [AmelYachtOwners] Amel's suggestion to run the Volvo D3-110 (A54) daily while on passage

Fantastic information from Olivier.  Thank you. I presume the flap is a specific Amel part or can we buy it elsewhere? I am totally for supporting Amel but the shipping costs from France get a bit high for a small part. :)

On another note, what is the general guideline for using the Volvo D3-110 and the Onan when the boat is heeled over? I do recall reading the Onan spec that it shouldn't be used at more than 10 degrees constant with short bursts to 20degrees. I can definitely hear a change in genset note when the boat is rolling and it is not related to the exhaust outlet going underwater. 

Back in my car racing days, I was very aware of oil starvation when the oil sloshes to the side of the oil sump while cornering. The solution there was either baffles (helps) or a dry sump. Is this a concern with our marine engines/genset?

--
Scott 
2007 A54 #69
SV Tengah
http://www.svtengah.com