[C320-list] OVERHEATING PROBLEMS

[bruceheyman at cox.net]

Alec,
I wonder if one of your shafts or pulleys are out of round or bent and causing wobble?  That might be a better explanation that the belt is too tight.  Also if it is an alignment issue I' would think you would find a lot of belt dust in the engine compartment.
Bruce
Somerset 671 SoCal
Sent via BlackBerry by AT&T

-----Original Message-----
From: Tbuilder at aol.com

Date: Mon, 6 Oct 2008 09:08:46 
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