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Old 11-14-2010
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1GM10 Oil Alarm Issue

While winterizing the engine I noticed a new problem with the oil alarm for the first time - It doesn't come on immediately after the engine stops.

I normally expect to see oil light and hear the buzzer whenever the key is in the on position and the engine isn't running. As soon as I start it the alarm goes off, and as soon as I stop it the alarm comes on again.

While winterizing I noticed the alarm would hesitate to come on after the engine stopped - it would take between maybe 5 to 20 seconds. To me this implies oil pressure gauge is marginal and needs to be replaced however I'm still new to sailboats and diesel engines.

Before I dive in and buy a new sensor what do you guys think?
1979 Contessa 26
Boston, Ma
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Old 11-14-2010
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A delay in the alarm probably means the sensor is slow to detect the pressure drop. The sensor may be sticking. If it takes that long to recognize a complete loss of pressure it may not tell you about a marginal oil pressure for a long time.

It's possible, I suppose, that you could remove it and soak it in solvent for a time and see if it frees up.. but I'm not directly familiar with the Yanmar parts.

For peace of mind I'd replace it.. hopefully it's not one of those ridiculously expensive Yanmar parts.

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Old 11-15-2010
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A slight delay upon shutdown is normal, but 20 seconds is too much. Was the engine fully warmed up when you experienced this? If the oil was cold, the oil presssure would have been high and the decay would take longer.
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Old 12-27-2010
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Mine too

I have an 84, 85ish Yanmar 1GM in my 85 Cal 27. I always hear the buzzer after I turn the key before I hit the ignition. Also I hear it when I stop the motor. I didn't hear it this time and started and stopped the motor a couple of times. It has been relatively cold in Florida the last few weeks. The oil temp explanation makes some sense but I wouldn't think 50 degree F oil being an issue.

Anyone got any ideas for me too?
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