[C320-list] Exhaust question

[Troy Dunn]

The water muffler is the most likely exhaust leak on the Yanmar.
Surprised you had an exhaust elbow issue, the elbows from that time frame
were stainless steel and seem to hold up for a very long time.   Did you
see the old elbow.   Was it stainless?  If so, was the leak at the weld
where the raw water tube is injecting water into the exhaust pipe?

Although the leaking muffler would explain water in the bilge, generally
the 'pan' under the engine fills with water when the exhaust muffler leaks.
  So, assuming you don’t have that issue and assuming the leak is happening
when not running the engine, I would start with the fresh water system.
If this is a freshwater leak you should either hear the pump cycle every
few minutes or so, or….the leak is before the pump which generally entails
some boat yoga to check the outlets of the water tanks.    If you narrow it
down to a freshwater leak beyond the pump (I.e. the pump is in fact cycling
when water isn’t in use) but don’t see any obvious water leaks…check around
the water heater under the galley sink.   The water heater (calorifier for
the folks across the pond) will eventually leak and have to be replaced.
Getting to all the fittings and connections requires removal of the galley
drawer unit.  Just remove the drawers, unscrew the frame and the whole unit
slides out.

Troy Dunn
Hull#514