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Old 21-09-2019, 04:18   #1
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Yanmar 3GM30F intermittent oil pressure alarm

We are heading back from Florida to New Orleans in pretty rolly 6ft seas. We’ve been running about 2800 for 8 hours, then dropped to 2200. The alarm chirps as we come off waves and roll to port. It will hold for up to 2-3 seconds.

1) is this a concern worthy of shutting down?

2) is this just a hot or faulty sensor?

3) is the oil sloshing around causing a problem with the actual oil pressure?

We’ve got 36 hours to go....thoughts are much appreciated.
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Old 21-09-2019, 05:26   #2
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Re: Yanmar 3GM30F intermittent oil pressure alarm

It could be a little of all three....

Can you run off downwind or heave to for a few moments and check the oil level? It could be a bit low causing an oil pickup problem when the boat rolls.

DougR
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Old 21-09-2019, 07:37   #3
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Re: Yanmar 3GM30F intermittent oil pressure alarm

Resolved:

1) We’re rolling along under sail at 7 knots.
2) The oil pump is on the starboard side of the engine. When we rolled to port, the pump was starved.
3) checking the level was useless. Since the oil was sloshing around.

4:::: Added 1/2 quart fixed it all. But now we don’t need the damn things haha.

Thanks.
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Old 21-09-2019, 16:58   #4
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Re: Yanmar 3GM30F intermittent oil pressure alarm

Quote:
Originally Posted by jwillis22 View Post
Resolved:

1) We’re rolling along under sail at 7 knots.
2) The oil pump is on the starboard side of the engine. When we rolled to port, the pump was starved.
3) checking the level was useless. Since the oil was sloshing around.

4:::: Added 1/2 quart fixed it all. But now we don’t need the damn things haha.

Thanks.


I'm happy to hear that you found the cause of the low oil pressure warning but if you're right then you came dangerously close to a major crankshaft seizure, that oil pickup sits remarkably close to the bottom of the oil pan and the engine must have been almost completely out of oil.
The oil pickup and screen when installed correctly is about in the geometric centre of the oil pan, not to one side.
Now would be a good time to do an oil and filter change.
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Old 21-09-2019, 19:45   #5
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Re: Yanmar 3GM30F intermittent oil pressure alarm

I have a vague recollection that both a shallow and a deep oil pan are available for these engines. Might be worth checking.
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Old 22-09-2019, 21:05   #6
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Location: Lake Ontario
Boat: Ontario 38 / Douglas 32 Mk II
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Re: Yanmar 3GM30F intermittent oil pressure alarm

Quote:
Originally Posted by jwillis22 View Post
We are heading back from Florida to New Orleans in pretty rolly 6ft seas. We’ve been running about 2800 for 8 hours, then dropped to 2200. The alarm chirps as we come off waves and roll to port. It will hold for up to 2-3 seconds.

1) is this a concern worthy of shutting down?

2) is this just a hot or faulty sensor?

3) is the oil sloshing around causing a problem with the actual oil pressure?

We’ve got 36 hours to go....thoughts are much appreciated.
Shouldn’t run engine if heeled more than 15 degrees.
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Old 22-09-2019, 21:07   #7
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Re: Yanmar 3GM30F intermittent oil pressure alarm

Did you reduce throttle to drop rpm?

If the engine lost 600 rpm on its own because it was starved of lubrication that is really not cool.
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