[C320-list] Engine water temp problem

[Jeff Hare]

Allan, you might want to check whether you actually got it from Yanmar or
from Seaward...

The standard Yanmar one for the 3GM30F engine isn't (typically) compatible
with the Catalina engine instrument pod's temp gauge.  The stock yanmar
sender unit is typically compatible with the stock yanmar engine panel's
temp gauge.  The one on Catalina yachts is typically a Stuart Warner unit
with a max temp of 240 degrees.  The resistance range is 240ohms -> 33ohms.

Catalina Direct carries it as does Doug Igarashi (digarashi at earthlink.net)
who as far as I know still sells the original Seaward line of products.  I
rather suspect CD gets them from Doug...

Worth looking into before running down to your local yanmar dealer (who will
almost certainly sell you the wrong part).

-Jeff Hare

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of Allan S Field
Sent: Thursday, April 6, 2017 2:20 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Engine water temp problem

Our boat was about 10 years old when the temp sender unit failed.  A
replacement was ordered from Yanmar for about $20 US 7 years ago and
installed in about 10 minutes.  Problem fixed.

Allan S. Field
Sea Shadow - C387, #103
Columbia, MD

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of Graeme Clark
Sent: Thursday, April 6, 2017 1:14 PM
To: C320-List at Catalina320.com
Subject: [C320-list] Engine water temp problem

First time I run the engine this year the water temp gauge goes off the
clock!
I therefore bought a point and shoot laser thermometer and sure enough the
engine temp ( measured where the sensor is and also at fuel injector points)
is around 170f whereas gauge is showing 280-290f

So it's the sensor or the gauge. How do I test the sensor.  There is only a
single terminal so I'm guessing the resistance changes with temp. Does
anyone know what resistance should be at say, 170f ?

Or is there a simple way to test gauge

I did have the instrument panel out this winter to repair the lid so it
could be a dodgy connection I guess. I'll check everything again but any
more info would be handy as I'm stuck on boat with limited internet access!

Graeme
#366, 1996 running Yanmar 3GM30F


Sent from mobile: please excuse typos etc.!