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Old 11-12-2022, 08:38   #1
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warm engine

weird problem!
I have a lagoon 380 s2 with ya mar engines.
my port side engine is warm without running engine!
any ideas why?
christine
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Old 11-12-2022, 08:43   #2
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Re: warm engine

Does your engine coolant have a freshwater heater loop, and if so, are you heating the hot water electrically?
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Old 11-12-2022, 08:58   #3
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Re: warm engine

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Originally Posted by pjShap View Post
Does your engine coolant have a freshwater heater loop, and if so, are you heating the hot water electrically?
not sure. just bought this boat
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Old 11-12-2022, 10:43   #4
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Re: warm engine

Is the entire engine warm, or is it localized, like the alternator?
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Old 11-12-2022, 13:04   #5
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Re: warm engine

Warm to the touch or thermometer reading warm?
JEB
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Old 11-12-2022, 13:36   #6
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Re: warm engine

+1 for heating via coolant loop thermosiphon through the water heater (assuming it's actually getting warm, not an anomalous gauge reading.)
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Old 11-12-2022, 17:04   #7
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Re: warm engine

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Warm to the touch or thermometer reading warm?
JEB
Warm to touch on head cover and block
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Old 11-12-2022, 17:06   #8
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Re: warm engine

turn off the water heater.
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Old 11-12-2022, 17:14   #9
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Re: warm engine

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Originally Posted by Jebtrois View Post
Warm to the touch or thermometer reading warm?
JEB
Warm to touch
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Old 11-12-2022, 17:17   #10
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Re: warm engine

Yes to both. Turned off water heater to see if engine cools down
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Old 11-12-2022, 17:18   #11
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Re: warm engine

Warm to touch
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Old 11-12-2022, 18:55   #12
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Re: warm engine

As others have said...water heater.
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Old 11-12-2022, 20:31   #13
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Re: warm engine

Ok
Thx to all. The engine did cool down when I turned water heater off. Where is water heater.? I couldnít see it. Starboard eng looks the same, but not hot.
Dous anyone know what the aux switch is for?
Why donít I get read out on engine parameters when I start engine?
No oil temp/pressure reading and no temperature reading
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Old 11-12-2022, 21:48   #14
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Re: warm engine

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Originally Posted by flyingcr View Post
Ok
Thx to all. The engine did cool down when I turned water heater off. Where is water heater.? I couldnít see it. Starboard eng looks the same, but not hot.
Dous anyone know what the aux switch is for?
Why donít I get read out on engine parameters when I start engine?
No oil temp/pressure reading and no temperature reading
Depending on year and engine model, Yanmar offers different engine operating panels. Some provide readouts; some only warning lights. Yanmar website is pretty informative. Obtain the manual for your specific model.
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