What is it?

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What is it?

Postby Anonymous » Tue Dec 13, 2005 3:33 am

Gentlemen: <BR>Having found water in the cylinders three times in the last three weeks I am somewhat anxious to solve the riddle: where's it coming from? <BR>The elbow seems intact. <BR>The riser seems to operate. <BR>The thing I cannot quite grasp is the connection between the exhaust hose going into the glassed-in box in the bilge behind the engine, and the vent loop breather, high up under the sink. I've had this boat almost two years and not had the problem and suddenly, admittedly after some boisterous downwind sailing with following seas (which my repair guy assures me is not the problem), I have it three times. There is a line running from the exhaust hose to the breather hose on the riser vent (see pic). We're talking about the yellow braided 1/2" i.d. hose coming out of the "stainless" fitting into the wet box. Where is it supposed to go and do? <BR>What is it for? My repair guy says this is the problem and has disconnected it from the riser vent, says I should plug it, leaving me with questions as to what it's for in the first place and am I trading one problem for another? <BR>Anybody know? Do you have one? Where does it go. <BR>Any wisdom appreciated. <BR>Ken<img src="http://www.hanschristian.org/discus/messages/2/1252.jpg" alt="whatsit nipple and hose">
Anonymous
 

What is it?

Postby courage » Wed Dec 14, 2005 12:41 am

Hmmm...Does your boat have its original powerplant?? Could this be one of those alternate methods of venting the crankcase? <BR> <BR>As far as the glassed box in the bilge <img src="http://www.hanschristian.org/discus/clipart/uhoh.gif" border=0> <BR> <BR>Sorry I couldn't be more help. <BR> <BR>Keep us posted with your findings!!
courage
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What is it?

Postby Anonymous » Thu Dec 15, 2005 4:01 am

Kenji, <BR> <BR>I have seen in the past where instead of using an antisiphon valve in the vented loop they just run a hose from the vented loop to the hydro hush muffler which is what the "glassed in box behind the engine" is. When you think about it this is a perfectly good solution as then you do not have to worry about the antisiphon valve failing. The only thing that you do have to worry about is that the hose running from the vented loop to the hydro hush box is not kinked or clogged. Has anything about that hose changed recently? If it is open and clear when the engine is running some water from the raw water pump may go through it but that is ok because it will only end up in the hydro hush which is where it should end up anyway. This is a good place for the hose to be able to deliver air to the vented loop and thus prevent a siphon which could in fact flood the cylinders as you have described. As I understand it, Hans Christian has built a number of exhaust systems where there is a "tee" up under the sink which does a number of things. (1) it divides the raw cooling water into two streams one of which is injected into the exhaust elbow, and the other which is carried aft through a separate hose and dumped into the exhaust stand pipe in the stern lazarette. This keeps the amount of water that the engine has to push up hill to a minimum. Also at that tee should be another hose (which essentially turns the tee into a cross). This small hose should runt to the hush box to get it's air from there when the engine is not running. I remember this arrangenment from boats way back when I was growing up on Long Island and it always seemed to work well. Check that little hose to make sur it is not blocked. If it is this will allow water to siphon intoo your engine through the exhaust. <BR>Sincerely, <BR>Chuck Schaefler
Anonymous
 

What is it?

Postby Anonymous » Thu Dec 15, 2005 11:28 am

Good Morning Kenji, <BR> <BR>After thinking more about all of this last night I thought that I should have mentioned that when you say that the vented loop is high up under the sink I am assuming that you have a 43 like mine. As I was loading the cruising gear over the years and my boat started to settle on her water line I did eventually get to the point where that tee or loop up under the sink was no longer high enough. When sailing on starboard tack I did begin to flood the exhaust system though the tee because of it
Anonymous
 

What is it?

Postby Anonymous » Thu Dec 15, 2005 7:02 pm

Sirs: <BR>This is exactly the info I needed. It lets me know that this is not an entirely rogue modification and that others have also experienced the same problem. <BR>Thanks very much. <BR>Ken Jenkins <BR>Mazatlan
Anonymous
 

What is it?

Postby Anonymous » Fri Dec 16, 2005 6:15 pm

kenji, <BR> <BR>I don't have a 43 but that box is an aqualift muffler. A vent line from there to anywhere inside the boat is seems is a bad idea.
Anonymous
 

What is it?

Postby Anonymous » Tue Dec 20, 2005 4:18 pm

Surely there must be a way to prevent the syphon without venting the exhaust to the interior of the boat?!
Anonymous
 

What is it?

Postby Anonymous » Thu Dec 22, 2005 8:39 pm

Good Morning Guys, <BR> <BR>I got back out here aboard ship where I usually have more time to look into the board and I see that this thing about the exhaust vent hose is still on going. The whole thing behind that hose on the exhaust elbow is really not that spectacular. It is really nothing more than a way to do away with the check valve or
Anonymous
 

What is it?

Postby Anonymous » Mon Dec 26, 2005 6:15 pm

Mike, <BR>Thanks very much for the reply. I was trying to picture in my mind how they could possibly have fit a vented loop up there in the original turned teak newel post that I had had on my boat when we purchased her. Now it all makes sense to me. I was kind of hoping that there was some type of trick that you could get away with by venting on the inlet side of the pump that would allow me to do away with the loop but I could not for the likes of me figure out what it could be. When you said that your unit was in the post and I knew the post was a lot smaller than what could possibly fit a loop I thought maybe there was a way that I could get around putting my loop on the counter top. I just about have mine built and I built it asthetically pleasing enough that I think Janet has already accepted the inevitable. I would hate to redo the post/ vent that I had made a number of years ago because I like the way it lets some of the heat out of there. <BR> <BR>It looks to me like somebody along the way came to the same conclusion that I had about the loop under the galley counter top not being high enough and made that modification to your boat. Did you do that, a previous owner, or do you think that was original from the factory? <BR>Chuck
Anonymous
 

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