From: jackson maddux
Sent: Monday, August 20, 2012 7:35 PM
To: [email protected]
Subject: Re: Stus-List Yanmar Problem
Kim, could you please elaborate on item #4, the mixing elbow? Where do I
look for it on the engine?
thanks,
-Jackson
Jackson,
Others have answered but to elaborate- Aft starboard top side of the engine.
follow the exhaust hose from the muffler back to the engine and it will
travel up into a cast metal "u" that is 'upside down'. There will be a hose
going into the U from the back of the heat exchanger (this connection seem
to vary a bit from year to year) This is why it is it is referred to as a
mixing elbow- the cooling water is mixed with the exhaust and pumped out
through the muffler. (ie the boat is 'spitting water' isn't it? ) With the
exhaust gases, heat and the seawater this elbow will crud up over the years
restricting the exhaust flow finally to the point that it effect
performance. There is a piece that is bolted to the engine that comes
straight back and then hooks 90 degrees straight-up into a stainless close
nipple that in turn screws into the mixing elbow. (note the nipple has right
and left threads) Often it will be easiest/necessary to unbolt the whole
assembly from the engine and separate everything in the comfort of you own
garage where you keep the big hammers, economy size PB Blaster, torch and
other implements of destruction. If you aren't on a budget just replace all
three parts and then you don't have to worry about separating everything
;-). There is a gasket which good practice says you should replace too.
Usually the piece that bolts to the engine will be ok. Maybe you can reuse
the stainless nipple but I'd do both it and the mixing elbow. Some claim you
can 'clean' them - I guess you can but I have never had any luck doing so
and having the results last any length of time. Access may be an issue- my
current 35 requires a contortionist. My last boat had much better access.
Note: do this after you have cleaned the prop, and changed the filters,
checked for water in the filter bowl etc. - do the cheap, obvious, and easy
first. If it is still acting up then this goes on the list of relatively
common possibilities.
Kim Brown
TrustMe!!! 35-3
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