Re: Amel's suggestion to run the Volvo D3-110 (A54) daily while on passage
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All early Super Maramu had metal mufflers, don’t recall the cut off when they switched to plastic. Olivier, do you know when the change was made? Jacques Carteau explained the reason for the change as noise/vibration abatement as the plastic mufflers would ‘pant’/flex and eliminate some noise/vibration where the metal ones wouldn’t. He noted that they wouldn’t corrode either. He didn’t appreciate my saying that they will melt if you lose the raw water pump.
If you still have a metal muffler, it’s a good idea to inspect the interior and especially the bottom on a regular basis, at least annually. When they fail it makes an awful mess of the engine compartment.
JOEL F. POTTER-CRUISING YACHT SPECIALIST~L.L.C.
THE EXPERIENCED AMEL GUY
UNSURPASSED AMEL MARKETING EXPERIENCE AND PRODUCT KNOWLEDGE
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From: main@AmelYachtOwners.groups.io <main@AmelYachtOwners.groups.io> On Behalf Of CW Bill Rouse
Sent: Tuesday, January 28, 2020 3:56 PM
To: main@AmelYachtOwners.groups.io Notification <firstname.lastname@example.org>
Subject: Re: [AmelYachtOwners] Amel's suggestion to run the Volvo D3-110 (A54) daily while on passage
You wrote: Hi Bill - do you mean that last section of exhaust looks modified/non-Amel or just generally speaking?
The answers to your questions are yes & yes.
See the attached as it may help you. Your SM, when new, probably had the plastic Vetus water muffler, not a stainless steel muffler. I assume there are previous owner modifications.
On Tue, Jan 28, 2020 at 2:45 PM CW Bill Rouse via Groups.Io <email@example.com> wrote:
I'll send you something directly that will probably help.
On Tue, Jan 28, 2020, 2:16 PM Mike Longcor (SV Trilogy) <svtrilogy53@...> wrote:
My understanding of the anti-siphon on the raw water line (between the exit from heat exchanger and input to exhaust elbow), is to prevent continuous water flow (after engine shutdown) through the intake line should something in the line break/leak/disconnect/etc. The design of most raw water pumps prevents this continuous flow as long as the vanes of the impeller are intact. The flow of water out of the anti-siphon while the engine is running provides a good visual check that 1. your anti-siphon is working and not clogged and 2. that your engine is getting a good supply of raw water for cooling. I'm not sure I follow Oliver's comment about water standing above the engine for long periods because I'm pretty sure the water would find it's way down to the muffler with or without a siphon break at the top. Again, this assumes your raw water pump/impeller is fully functional, and those certainly fail from time to time. So a working anti-siphon is a good way to ensure your engine doesn't flood and/or your boat doesn't sink.
I may be wrong on some of this so if anyone has any other input please share.
Also... I'm still searching for any information on the rubber anti-return flap at the end of the exhaust line near the through hull. Has anyone bought, replaced, or fabricated something like this for their Amel?
SV Trilogy - SM23
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