[Public-List] Engine cooling plumbing - Yanmar

[Chris Martin]

 Thanks guys, I appreciate the help. I still need to measure. I did spend some time on it tonight and finally got the exhaust hose off and think this might be more $$ than I'd hoped. It needs more time in the parts washer but its crusty and the water inlet was pretty blocked. That explains the restricted flow out the exhaust this year. I didnt run the motor a much this year at all and there seemed to be less than I remember coming out the exhaust. Not scientific but seems like less is as good as I get right now. 
Chris
    On Tuesday, November 28, 2017, 8:32:01 AM EST, Andrew Johns via Public-List <public-list at lists.alberg30.org> wrote:  
 
 Chris,

I would keep the vented loop in the raw water line between the heat
exchanger and the mixing elbow.  The exhaust manifolds on these boats tend
to sit very close to the waterline and you may not have 12in at all times
(under sail).  It prevents water from filling the muffler and eventually
engine with water when seacock is open and engine is off.

Andrew

On Mon, Nov 27, 2017 at 3:24 PM, Mike Lehman via Public-List <
public-list at lists.alberg30.org> wrote:

> The mixing elbow is a weak part of the Yanmar engine and needs replacing
> periodically. As for the water line, you can estimate it to be about 3-4"
> below the bottom of the sink.
>
> On Nov 27, 2017 2:33 PM, "Chris Martin via Public-List" <
> public-list at lists.alberg30.org> wrote:
>
> >  Hello
> > Please let me know when I reach my question limit. While I'm waiting on
> > parts I started taking more the boat apart. I cleaned the heat exchanger,
> > plan to replace cooling hoses and impeller and am thinking about the
> mixing
> > elbow. One thing I'm not sure about is the layout of the cooling line
> from
> > the heat exchanger to the mixing elbow. I've found a few opinions on
> this,
> > anyone gone through this lately? Yanmar 2gm20-f.
> > I found this which is close to what I have
> > http://i1121.photobucket.com/albums/l518/svsundowner/boatexh.jpg
> >
> > I need to figure out the waterline measurement, it doesnt seem like 12"
> is
> > an issue.
> > I would like to remove this if only to simplify and reduce the number of
> > connections/clamps. Just put it back the way it was, replace the
> loop/vent?
> > Or just straight shot from the heat exchanger to the exhaust?
> > Also, my mixing elbow is soaking, anyone have a good source for these?
> How
> > long do they normally last? This is the first I've touched this part of
> the
> > boat so I have no idea how old it is.
> > Thanks
> > Chris
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