[C320-list] Yanmar 3YM30 - Leaking hose barb

[Allan S. Field]

Brad - I can't help you with the 3YM30m but...on my previous boat, the
alternator wore a hole through the hose.  I was sailing on the Patapsco in
March, a friend went down below, and coming back up, asked if 4 inches of
water sloshing around over the floor boards was normal.  Fortunately, it
only took me about 10-15 minutes to figure out where my leak was coming from
and get it fixed.  And fortunately, I was not singlehanded that day and had
a friend who went down below and discovered the water.  The point is that
you need to get the hose away from the alternator immediately and replace
any hose with wear patterns.    But was that water ever cold... - Allan
	
-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Brad Kuether
Sent: Friday, July 02, 2010 9:51 PM
To: C320-List at Catalina320.com
Subject: [C320-list] Yanmar 3YM30 - Leaking hose barb

Hey everyone, 

Well I tracked down the mysterious leak of anti freeze and have traced it to
the hose barb that supplies the hot water heater, (Or possibly returns it).
It will need to be removed and rebedded.

Some things that I found somewhat concerning on this 2004 boat with a
3YM30....:

  a.. The hose barb had tons of threads exposed.  Maybe not the right size?
  b.. The "paste" used to seal the barb was very soft and almost melted
after the engine was hot.  My neighbor indicated that it "wasn't the right
stuff" for that application.
  c.. The hose that connects to the hose barb is run over the alternator.
It is wearing through the hose.
  d.. The return is a long bronze tube the sticks way out of the engine to
pick up the return hose.
  e.. The return hose is run "behind" the alternator, and shows significant
wear.
  f.. Overall this doesn't feel "right" for a 2004 boat with 204 hours
total.  It almost feels like the water heater was a "second thought" and was
installed by a car mechanic.
Has anyone else seen this type of hot water heater hose installation on
their 3YM30s?

Has anyone seen some of the same symptoms?

Has anyone changed it around so the hoses are less suseptable wear?

Has anyone re-run new hot water heater hoses, and about how long did it take
and what might I watch out for?

ANY advise appreciated.

What a bummer and I was in such a sailing groove as of late.

-Brad, Mary, Monica, and Jarod
"Independence"
2004 Catalina 320 Hull 1006
Middle River, MD