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Old 21-07-2008, 21:51   #1
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Yanmar 3jh2 low oil pressure

I was running on Sunday and the engine had been on for an hour when the oil pressurre alarm came on. Checked the oil, level is good, no big leaks , no evdience. Now t check the oil switch. there seem to be two switches there on the side if the block. one is verticle ad one is horizontal.

I guees I need to get a real gage and test the pressures and hope the alarm sensor is defective.

Any suggestions.
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Old 22-07-2008, 16:57   #2
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One is for high water temp and one for low oil pressure. So are you sure it was low oil pressure or were you overheating which is more common
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Old 22-07-2008, 21:42   #3
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Found the problem. Lead from oil pressure was getting to ground causing the alarm. Also found in manual the other sensor is for non exisitant oil pressure gauge.

Thanks for the reply
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Old 22-07-2008, 22:05   #4
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As my instructor....THE Port Engineer said when I was younger re troubleshooting

Three things.

Look for the simple things first

The same speck of dirt that stops your sailboat will stop this tug

Never....EVER.....Let the Capatain touch your engines!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 22-07-2008, 22:25   #5
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I the captain/chief engineer , managed to trap said wire from the oil pressure switch between starter and engine block while installing said starter Friday. Blaming it on old eyes and poor lighting. But I got it clear now. Seeing the corrosion problems in my "this old boat" . I have two diifferent issues to correct next. A bad connection to the tach on one and the kill swithch/solenoid on the other engine. .....and then.......and then
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Old 23-07-2008, 19:16   #6
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I hate it when that happens....or when your hand is twisted back on itself while you are trying to startanutwiththesunbeatingdownonyouandthesweatroll ingintoyoureyesonly
torealizethatafter10minutesyouareturningitinthewro ngdirection GRRRRRRR!
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