[C320-list] Engine water temp problem

[Graeme Clark]

Jeff
Am I right in assuming the resistance decreases with temperature it is it the other way round
Immediately after I shit down the engine the resistance across the sender was about 35 ohms. The gauge was off the high end of the scale at that point!
Graeme

Sent from mobile: please excuse typos etc.!


> On 6 Apr 2017, at 23:50, Jeff Hare <Catalina at thehares.com> wrote:
> 
> 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.!
> 
>