[C320-list] OVERHEATING PROBLEMS and EXHAUST VENT UPDATE

[Pat Moriarty]

On this subject is exhaust elbow problems a salt water deal or does 
it happen in fresh water boats too?


Pat #130


At 10:26 AM 10/6/2008, you wrote:
>1.  Since I have a 2004 and I think this was first production year?,
>does anyone know the process for checking with Yanmar if there is a
>recall and then how to get access to recall?
>
>The Yanmar web site isn't exactly service oriented for support and the
>local mechanics don't seem to enthused about tracking down recalls.
>
>2.  Also one post suggested removing the Heat Exchanger for inspection.
>Based on its location, is there a trick to doing this as there is a very
>small space between engine compartment enclosure and exchanger?  Would
>need to do this to confirm which model I have
>
>3. As an update to the problem, I spent Saturday checking the Exhaust
>Venting system as suggest by one post.
>
>Findings:
>1 Hose from exhaust elbow was plugged with carbon on top end- cleaned.
>Rest of first hose 12" long was clean
>
>2 Upon poking found the 90 degree brass fitting from the exhaust elbow
>was solidly clogged with carbon- removed and cleaned. This is a brass
>fitting and can be removed with a wrench easily. It is at top of exhaust
>elbow
>
>3 Looked in Exhaust elbow through fitting hole and discovered exhaust
>elbow was also clogged solidly at that point-  cleaned as much as
>possible through hole.
>
>4 Vent itself was fine and worked properly.
>
>5 Left Vent off, put bucket under hoses and started engine. This forced
>a bunch of water with carbon/debris out of the hose in the port
>lazerette .
>
>6.  The whole process once you find all the components can be done in
>under 1 hour and is easily accessible from the rear stateroom.
>
>Reassembled and seem to have an improved water flow in exhaust. Couldn't
>do a test run as the rain was coming down in sheets.
>
>This leads me to believe that the motor with 1400 hrs on it  has not
>been run at high RPM as the amount of carbon seems excessive.( I
>purchased boat this year). I think for my next action I may remove the
>exhaust elbow and inspect
>
>
>
>Dave Marecek
>250 516 5117
>-----Original Message-----
>From: c320-list-bounces at lists.catalina320.com
>[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of
>Tbuilder at aol.com
>Sent: Monday, October 06, 2008 6:09 AM
>To: c320-list at lists.catalina320.com
>Subject: [C320-list] OVERHEATING PROBLEMS
>
>Interesting thread! My first 320 #212 with a Perkins engine had
>absolutely
>no problems. The second 320 - # 1021 with a Yanmar engine which was
>delivered
>in  UK in April 2007 overheated at anything much over 2000 rpm.
>
>I discovered that Yanmar had introduced an upgrade to the heat
>exchanger
>sometime previously but for some reason my engine had the old  exchanger
>still
>fitted. The original had about 8 cooling tubes inside it whereas  the
>newer
>model has about 15 tubes. I spoke to the Yanmar UK main agent and had  a
>brand new
>heat exchanger within a couple of days and it took about an hour to
>fit.
>Result - no more overheating - unless I am getting weed in the raw
>seawater
>filter!  It might be worth checking that you all have the improved
>exchanger
>fitted.
>
>I am however experiencing a significant leak from the water pump
>bearings.  I
>have fitted two brand new pumps - under warranty - and also two new sets
>of
>bearings. Yanmar say it is either an alignment problem OR the drivebelt
>is
>too tight. I can't do much about alignment and am following the manual
>exactly
>as far as belt tension is concerned. Has anyone else had the same
>problem? I
>will have to respray the block this winter due to salt water  corrosion!
>
>Cheers
>
>
>Alec  Blanc
>FIGMENT III  #1081
>Lochaber Watersports
>Ballachulish
>Scotland
>_www.lochaberwatersports.co.uk_ (http://www.lochaberwatersports.co.uk/)
>01855  821391 / 07831 846025
>
>
>
>
>

Pat Moriarty
PSI Urethanes Inc
PH: 800-888-5156  Fax: 512-837-8733
Please visit our web site at
www.psiurethanes.com