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Join Date: Sep 2005
Location: New Westminster, BC
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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.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)