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

[Allan S. Field]

Great idea Larry!  Thanks.

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Larry Frank
Sent: Saturday, July 03, 2010 9:28 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Yanmar 3YM30 - Leaking hose barb

I do not have the Yanmar so I cannot picture the hose routing or hose barbs
so I won't comment on these.  Others will.

One thing I do is to tie wrap a sacrificial piece of hose on the outside of
any engine hose that is in contact with another piece of the engine.  If
course the best thing is to route the hose so there is no contact in the
first place but failing this, the sacrificial piece will be the part to get
abraded, not the actual hose you depend on.

Larry
WindSwept 
C320 #246

-----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 8:51 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