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High water Temp Sensor

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5 years 5 months ago - 5 years 5 months ago #196599 by Oilman
I was trying to test my high water temp sensor that is fitted to the Gardner. It has no markings on it, so I don't know the brand/model or the temperature at which it is supposed to trip. The truck only runs a 4 psi cap, so I would have thought around 100 C. I put it in boiling water and it was still open circuit. Can anyone share any useful information/suggestions.


1975 Atkinson, 180HP 6LXB Gardner, RTO910, 34000lb Rockwell on camelback
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Last edit: 5 years 5 months ago by Oilman.

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5 years 5 months ago - 5 years 5 months ago #196606 by Southbound
Replied by Southbound on topic High water Temp Sensor
Looks like the same switch that was fitted to Holden Grey and Red motors, so perhaps try Supercheap, Ripco or Bursons.

I'd rather have tools that I don't need, than not have the tools I do need.
Last edit: 5 years 5 months ago by Southbound.
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5 years 5 months ago - 5 years 5 months ago #196608 by Lang
Replied by Lang on topic High water Temp Sensor
No eBay APP ID and/or Cert ID defined in Kunena configurationI am sure Southbound is right. These are a universal generic sender. Bought for a few dollars at Supercheap or on line. They nearly all come with a couple of thread size adaptors to make them fit just about any engine.



Here is a Gardner genuine.
gardnerspares.com/product/temperature-gauge-24-volt/

And the sender, note it has thread adapters.
gardnerspares.com/product/water-temperature-gauge-sender/
Last edit: 5 years 5 months ago by Lang.

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5 years 5 months ago #196627 by Oilman
Replied by Oilman on topic High water Temp Sensor
The engine already has a temperature sender connected to the gauge, but this one triggers a 'high temp' light on the dash if the engine overheats. Therefore I think it is more like a switch rather than a variable resistor and would 'close' at a set temperature to trigger the light?

1975 Atkinson, 180HP 6LXB Gardner, RTO910, 34000lb Rockwell on camelback

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5 years 5 months ago - 5 years 5 months ago #196628 by Lang
Replied by Lang on topic High water Temp Sensor
Like this?




I found some on Google and Ebay. Most larger outboard motors have them so a marine place would be the go (with thread adapters) also.

Here is something for $99 which will do the job.
engineguard.com.au/?gclid=Cj0KCQjw9ZDeBR...wbxPEgcaAqHuEALw_wcB

Lang
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Last edit: 5 years 5 months ago by Lang.

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5 years 5 months ago - 5 years 5 months ago #196629 by Blackduck59
Replied by Blackduck59 on topic High water Temp Sensor
Check the Tridon site, they have all sorts of switches with various settings and thread sizes,
Cheers Steve
Tridon TTS033 or
automotivesuperstore.com.au/fuelmiser-ct...NEAYYBCABEgIl9vD_BwE

On checking that Tridon switch it is set to 125 C, no wonder the old Holden lights were just telling you your motor is stuffed.
Boiling water may not get high enough to check that switch, heat gun and IR temperature gun.
Other than that just find a switch that works around 105-110 C, as you have a gauge as well it will just take your attention to the gauge.
Last edit: 5 years 5 months ago by Blackduck59.

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5 years 5 months ago #196636 by cobbadog
Replied by cobbadog on topic High water Temp Sensor
Many of the old Holden engines ran at 180'C and that was confirmed by installing a gauge as well as the temp light and never cooked a grey or red engine ever. Having said that the radiator cap was at 12 - 15 psi from my memory. Water under pressure takes higher temps to boil.

Cheers Cobba & Cobbarette
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5 years 5 months ago #196640 by wee-allis
Replied by wee-allis on topic High water Temp Sensor
John, I think you meant 180Deg F for the old Holdens. The only engine I remember which ran at 180Deg C were some hot VW which got their oil to that point.
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5 years 5 months ago - 5 years 5 months ago #196644 by Blackduck59
Replied by Blackduck59 on topic High water Temp Sensor
Not sure if the old Holdens were 7 or 13, (could dig out some old manuals) 13 would give boiling point around 251F/121 C
With his 4 psi cap you are looking at 225 F/107 C, that is plain water. Decent coolant/inhibitor will help a bit
That why I suggested a switch around 106 C, will let you know you have reached the limits of the system.
Even lights are easy to miss at times, a good buzzer hooked into the system will get your attention quick.
Cheers Steve
Last edit: 5 years 5 months ago by Blackduck59.

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5 years 5 months ago #196647 by Oilman
Replied by Oilman on topic High water Temp Sensor
Of course the sensor I have could still be OK as I have only tested it up to 100 C. Not sure of how to test it at a higher temp, perhaps have to use the deep fryer?

1975 Atkinson, 180HP 6LXB Gardner, RTO910, 34000lb Rockwell on camelback

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