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Old 18-11-2017, 20:28   #1
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Join Date: Nov 2015
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Coolant loss in Yanmar 30

The level of coolant in the reservoir of my Yanmar 30 diesel drops markedly during engine use. What are the possible causes - I imagine these could range from bad to disastrous! Couldn't see any red coolant under the engine. Any ideas where to start?
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Old 18-11-2017, 21:00   #2
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Re: Coolant loss in Yanmar 30

Sorry to hear this. Could be going into oil, or out with raw water. Also check all rubber hoses & clamps....coolant may be leaking, pooling out of sight and drying.
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Old 19-11-2017, 05:51   #3
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Re: Coolant loss in Yanmar 30

Most likely is a leak in the heat exchanger that allows coolant into the exhaust.

Next most likely is a bad head gasket, but you'd probably have noticed that by now... Hard starting, white smoke etc.
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coolant, yanmar

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