[C320-list] Engine water temp problem

[Jeff Hare]

Yup, you're excused. Autocorrect is hilarious.  😊  Anyway, sounds like bad sender.  You can pretty easily check it using the procedure on our website.

http://c320.org/article.php/2012072022490543

-Jeff

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Graeme Clark
Sent: Friday, April 7, 2017 4:50 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Engine water temp problem

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.!
> 
>