[C320-list] Engine water temp problem

[Jon Vez]

Sorry, yes I was referring to the thermostat....

Sent from my iPad

> On Apr 8, 2017, at 2:21 PM, Jeff Hare <Catalina at thehares.com> wrote:
> 
> Wouldn't that be the test procedure for the thermostat?  I suppose you could
> test the sender that way also, as the water heats, you should see the
> resistance on the sender drop as well.
> 
> -----Original Message-----
> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
> Of Jon Vez
> Sent: Saturday, April 8, 2017 2:11 PM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Engine water temp problem
> 
> Graham,
> An easy way to test if the sender is good is to put it in a pot of water
> with thermometer and bring the pot to 170-180F and you can see it pop open
> if it's good.....
> 
> Sent from my iPad
> 
>> On Apr 8, 2017, at 1:18 PM, Graeme Clark <cg at skyflyer.co.uk> wrote:
>> 
>> Rick
>> Thanks for the tip but the gauge does "climb" as the engine warms? it
> doesn't go straight to max reading!
>> I haven't yet had a chance to troubleshoot further. Possibly tomorrow if
> it's fine weather as I want to start by cleaning up all contacts. 
>> My gut feeling is the most likely reason for a problem is because of
> something I did rather than a random failure whilst the boat was laid up
> over winter  - it would be odd for a temp sender to fail when it sits in an
> unused engine for six months, surely!
>> All options will be explored though!
>> Graeme
>> 
>> Sent from mobile: please excuse typos etc.!
>> 
>> 
>>> On 8 Apr 2017, at 15:34, Rick Sulewski <rsulewski at bex.net> wrote:
>>> 
>>> Graeme,
>>> If you did anything with your wiring over layup you could have a sensor
> lead  grounding and pegging your gauge. For example, several years ago I had
> my valve cover off to adjust my Westerbeke valves and inadvertently pinched
> the temp sensor lead when the cover was reinstalled and that caused my temp
> gauge to peg.
>>> Rick
>>> 
>>> -----Original Message-----
>>> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On
> Behalf Of Onat Dogruer
>>> Sent: Friday, April 07, 2017 11:17 AM
>>> To: C320-List at Catalina320.com
>>> Subject: Re: [C320-list] Engine water temp problem
>>> 
>>> On a side note, I just replaced the 18 year-old Johnson water pump (with
> same model Johnson pump) on our Yanmar and the temperature is not going
> above 160. It used to hover around 170F. I wonder if they improved somehow
> the efficiency. 
>>> -OnatKittiwake #546, 1998
>>> 
>>>    From: Allan S Field <allan.field at verizon.net>
>>> To: C320-List at Catalina320.com
>>> Sent: Thursday, April 6, 2017 2:20 PM
>>> 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.!
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>> 
>