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Old 08-06-2020, 05:44 PM   #1
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Thermostat question

... on a diesel generator.

Our backup generator at work had to start last weekend. After almost an hour, it ran hot and shut off. The vendor determined the oil cooler had failed and let oil into the coolant. They replaced the cooler but then determined the 'stat had failed due to the oil. The 'stat is only about a year old. Can the engine oil cause the 'stat to fail?

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Old 08-09-2020, 05:39 AM   #2
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Engine oil can/will cause anything with rubber to swell up. This can lead to leaks, sticking and hoses coming apart internally. The correct way with oil in coolant is if it will run with original hoses get it to temp with some decent flush in it then drain it out repeat as needed to get all oil out. After that then go in and change all rubber including stat that has a rubber center section out.
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