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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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  • 1 Post By jimgo
  • 1 Post By 73Morgan
  • 1 Post By fryewe
  • 1 Post By jameswilson29
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Old 09-30-2013
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False temp alarm does not go out after start up

After pushing the glow plug button on my Vetus M3.10, normally an alarm sounds until the on button is pushed and the engine is started. Yesterday, for the first time, the alarm did not go off upon starting. The engine temperature light is on; however, the engine is not overheating, the fresh water cooling system works, and the exhaust water is not hot.

If I momentarily press the engine off button, the alarm stops without killing the engine and the engine temp light goes off, but the tachometer stops working. The engine continues to run normally otherwise. There is adequate oil, battery voltage, and coolant.

As far as I know there is no engine water exhaust sensor. Any idea what kind of problem this reveals? Bad circuit, bad connection?

Last edited by jameswilson29; 09-30-2013 at 09:07 AM.
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Old 09-30-2013
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Re: False temp alarm does not go out after start up

Sounds like it might be either a bad temp. sender or a wiring problem. Given that it can turn on/off, I'm inclined to think it's the sender.
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Old 10-07-2013
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Re: False temp alarm does not go out after start up

Disconnect the wire at the sender. If the light goes off it's your sender. If the light stays on its in the wiring.
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Old 10-07-2013
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Re: False temp alarm does not go out after start up

I don't have Vetus but Yanmar...but my panel alarm sounding on engine startup is the low oil pressure alarm which clears when the oil pressure builds up after engine start.

Both the low oil P and high T senders are switches that shut when fault conditions are met to energize the alarm circuits for the audible alarms and lights. Sometimes such switches energize separate relays that operate contacts to complete the alarm circuits. In such cases either circuit could be at fault but if momentary operation of the shutdown switch (loading the circuit to drop voltage?) clears the alarm it's more likely the relay circuit rather than the sensing circuit - if you have such an arrangement.

A high temp sender is easily tested by removing it and placing it in hot water and checking the switch operation with an ohmmeter.
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Old 01-04-2014
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Re: False temp alarm does not go out after start up

BUMP for UPDATE:

It was the temperature sensor on the exhaust elbow, which was fairly easily replaced. I did follow the test recommended by 73Morgan by disconnecting the sensor wire to eliminate the possibility of the panel malfunctioning. My engine is running normally again.

Thanks all for your helpful posts.
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