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Thu, April 18 2024, 23:28 [ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, [3], 4, 5, 6, 7, 8, 9 ]

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Date Posted: - Monday - 06/27/11 - 4:01pm
Author: Lawrence Killingsworth M40 Ta' Ata Ori
Subject: Nuku Hiva
In reply to: Randall, Murre, M31 Hull #150 's message, "Engine Exhaust issue" on - Monday - 06/27/11 - 12:55pm

Sorry to hear about your engine troubles, Randall. I don't have any mechanical advice for you, but I just wanted to comment on how much I am enjoying reading your blogs from your sailing adventure. Well done and much appreciated by those of us back here on the mainland.
Back in the late 70s, Ta' Ata Ori was dismasted (main mast) on her way from Mexico to the Marquesas. She limped into Nuku Hiva, where local craftsmen helped the owner at that time to build a mast out of island wood and re-step it, using the crane from a trading steamer. I have pictures of the whole process. So, just to say, your exhaust may be goofy, but at least you made it into Nuku Hiva with all your masts.
Best of luck with the rest of your voyage and thanks for taking us along.

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Replies:

[> Syphoned loop -- Paul M31 #106 NJ, - Monday - 06/27/11 - 8:47pm

On Guillemot I have the exhaust, after being pushed out from the waterlift muffler, going straight up to the underside of the port cockpit seat, where it is connecte3d to 2 90 degree elbows thus forming a fairly tight "U" and then it comes back down to to another 90 elbow and is lead aft, starting slightly higher than the exhaust through-hull which is in the same location as you describe, a few inches above the water, on the underside of the hull. The line basically runs on the underside of the locker (false) floor.

On the other side of the water lift muffler, the raw water injection fitting onto the injection elbow is outfitted with a "T" - the main direction being to the injection elbow (downward), but also allowing for a 1/4" nipple to point upward, to which a plastic 1/4" line is connected. This 1/4" line runs along the exhaust lines up to under the cocpit seat, but then comes through the cockpit wall, runs down the side of the cockpit well to just above the portside cocpit drain, in which it squirts. This little line serves two purposes - 1) one can instantly see water pressure, much like the "pisser" (for lack of a better word) on an outboard engine, verifying water flow; 2) once you turn the engine off, the little line instantly breaks the vacuum (one can hear noticable "gurgling" going on)and thus prevents syphoning and/or back flow into the waterlift muffler, ultimately into the exhause manifold..

The top of both loop bends are just under the seat as such well above the waterline and effectively prevents water flowing back.

As was stated earlier, some components in this system can be made from grey PVC - mine are, to the surveyor's shachrin - though most of it is either multi-ply rubber exhaust hose, galvanized pipe, or brass... All the PVC parts are on the exhaust side of the waterlift muffler.

I will try to post pics of the loop and the plastic vacuum break line...

Hopefully this helps a bit.


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[> [> Some pics... -- Paul M31 # 106, NJ, - Monday - 06/27/11 - 9:03pm

Main loop with 1/4" line showing going through the plywood into the cockpit well

Photobucket

Hard to see, but in top left corner you see the "T" at the injection elbow raw water inlet - with the small 1/4' line leading up...

Photobucket


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