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post #1 of 6 Old 09-06-2013 Thread Starter
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Low range temperature gauge for raw water cooled engine?

My engine is raw water cooled, so normal operating range is only about 125F. The PO put in some aftermarket gauges (Teleflex), with the temp range of 120 - 240, which seems to be standard for marine water temperature gauges. But at operating temps, it barely comes off the bottom peg.

Google hasn't revealed any gauges that are the proper range for raw water cooled engines, but I've got to think they're out there. Any suggestions where I might find such an animal?

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post #2 of 6 Old 09-07-2013
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Re: Low range temperature gauge for raw water cooled engine?

I would doubt that your "normal operating range" for your engine will be only 125F. It should probably be more like 185F or higher. If the temperature gauge is actually working, I would check to make sure you have a thermostat installed. 125F would suggest the water is just being pushed through without allowing it to heat up to whatever your real normal engine operating temperature range would be. Check for that first. If there is a thermostat installed, make sure it is opening and closing properly. 125F is way too cool for an engine.

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post #3 of 6 Old 09-07-2013 Thread Starter
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Re: Low range temperature gauge for raw water cooled engine?

Raw water cooled engines run colder than those with heat exchangers, in order to prevent the salt from precipitating.


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post #4 of 6 Old 09-07-2013
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Re: Low range temperature gauge for raw water cooled engine?

What type of engine? Does it have a T-stat? After running, shut the engine down and then turn the key on briefly and see if the temp spikes. That will tell you if it is working. Many ways to configure a cooling system, by-passes, recirculating loops, manual flow control etc. All can help bring the temp up to what ever temp you want. Infrared thermometer gun can also give you more info at different locations on the engine. I do not think a new gauge is what you need.
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post #5 of 6 Old 09-07-2013
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Re: Low range temperature gauge for raw water cooled engine?

Rusty123 is correct that his engine should run at a low temperature. The Yanmar thermostat for a 2GM20 (raw water cooled) is fully open at 126F, compared to 185F for the fresh water cooled.

It looks like Faria makes gauges that start at 100F instead of 120F. Fisheries Supplies stocks them.

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Re: Low range temperature gauge for raw water cooled engine?

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Originally Posted by Alex W View Post
Rusty123 is correct that his engine should run at a low temperature. The Yanmar thermostat for a 2GM20 (raw water cooled) is fully open at 126F, compared to 185F for the fresh water cooled.

It looks like Faria makes gauges that start at 100F instead of 120F. Fisheries Supplies stocks them.
Thanks Alex. That's better than I have, but I'm hoping to find one even lower - perhaps 50 or 75. I'd like to be able to watch the temps rise. I'll keep looking, because I missed even the Faria gauges initially.

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