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Old 04-05-2019, 03:11 PM   #21
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I see 140F temperature mentioned a few times and that is what I assumed was the temp for raw water cooling. My engine though is running at 122 or so and according to the thermostat specs for that engine that is the correct temp. Why the difference?
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Old 04-05-2019, 08:08 PM   #22
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Don't some corrosion processes become more aggressive at higher temps? And wouldn't that be a factor with raw water in a cooling jacket system?
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Old 04-07-2019, 06:30 AM   #23
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"Don't some corrosion processes become more aggressive at higher temps? And wouldn't that be a factor with raw water in a cooling jacket system?"

"I have an older Yanmar 3HM. It is keel cooled and seems to be in good shape."

The fluid inside a keel cooled engine is usually anti freeze which has anti corrosive properties.
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Old 04-17-2019, 10:24 AM   #24
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I mentioned that I had gotten the parts to add an external thermostat to my 3HM. Well last weekend I installed it after realizing I could simplify the installation and could always go back fairly easily. The thermostat is the very nice bronze casting in the photo and was originally designed for the Atomic 4. It uses a easily available NAPA thermostat. It is attached to the coolant outlet of the exhaust manifold. I reversed the exhaust manifold coolant flow from front to back to back to front. There is a bypass from the thermostat to a T at the inlet of the coolant (rubber impeller) pump for fast warm ups and even temps. The system seems to be working great. I was confused for a while as my temp gauge was showing 160° with a 180° thermostat. I figured out that my temp sender is installed in the head and the thermostat is seeing coolant coming out of the exhaust manifold. Reading temp at the sender I see 160° but at the fitting going into the thermostat it says 183°.

I will give a shout out to my digital temp gauge as we're on the subject. Made by Cruzpro it is very accurate and includes an alarm.
CruzPro T60 Digital Water Temperature Gauge and Alarm

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