[C320-list] OVERHEATING PROBLEMS

[David Marecek]

Update on Overheating Problems

1.  I checked with Yanmar and there is no recall on the 8 tube heat
exchanger for 2004 in North America . However you can purchase the new
15 tube heat exchanger for 1000+ CDN. Seems strange that new boats now
come with 15 tubes for the same engine.

2. I removed the Exhaust elbow from the engine this weekend.  It was
pretty clogged with carbon, so cleaned and chipped it out and
reinstalled.

Result was I could run at 2900 rpm( this is 800 rpm better than when I
started the process) with a steady 180 degrees. If I ran up to 3400 rpm
(Max rpm due to Maxprop), I could hold 180 for about 5 min, but then
temp crept up towards 220.  When I backed off down to 2500 rpm to cool,
it took a long time to bring temp back down to 180.  There is now lots
of water flow in the exhaust, so next step is to pull the heat exchanger
and examine to see if clean.  I sense this maybe an issue since the cool
down from over temp took a very long time ie 10 min which suggests the
heat exchange may not be real efficient. 


Dave Marecek 
-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Kirk
McCullough
Sent: Sunday, October 12, 2008 8:11 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] OVERHEATING PROBLEMS

The only time in 10 years my Perkins has overheated is on one occassion
when 
the intake got clogged with weeds. I used the dinghy pump to blow out
the 
mass of eel grass and carried on my way.

Seems some of the Yanmars do overheat more than the Perkins.

Kirk
#!24


----- Original Message ----- 
From: <Tbuilder at aol.com>
To: <c320-list at lists.catalina320.com>
Sent: Monday, October 06, 2008 6:08 AM
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
>
>
>
>
>