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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 10-11-2010
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No oil pressure after oil change

Have a strange issue with my M25XPB. First of all, the boat/engine are new to me and the boat has sat in dry storage for about two years. I had the diesel tank cleaned out and filled with fresh diesel, put on a new Racor etc and the engine fired up and ran perfectly. Oil pressure was between 50-60 psi when I was warming it up. I then changed the oil and filter, checked the oil level and fired it back up. The alarm never shut off and the oil pressure gauge was reading 0 psi. I shut the engine down and checked the oil and the level was fine. I then tested the switch by grounding and it seems to be fine. To rule out the sender, I fired it up again and tested with a mechanical gauge. It was reading a little less than 5 psi with the mechanical gauge. I pulled the hose that goes from the block (above the filter) to the sender switch fitting and cranked the engine over a few times and it seems that no oil is pumping through that hole (the one in the block above the filter). There was oil in the new filter when checked, so it seems that oil is getting from the pump to filter.

I find it very odd that this happened so suddenly. What could be blocking oil flow between the filter and the sender (and rest of the engine)?
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Old 10-11-2010
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First thought.... did you get the correct filter? Five PSI is definitely low and I wouldn't run the engine long without fixing this.

Worst case scenario is that your lube pump has failed, but that's pretty rare.. mind you that pump probably won't like trying to pump against a dead head either, so if something did block the pump discharge it may now be damaged.. but hopefully it's not as dire as that....
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I did get the recommended filter but it was different than the one the PO had on it. They look almost identical. It does look like oil is getting pumped into the filter...just not getting past there for some reason. Very odd that is happened suddenly after an oil change.
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Old 10-12-2010
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get a new filter!
not the same one you have now, but a crossed matched from a different manufacturer. some filters have none return valves in them and may not be right for your engine.
For $10 it's worth a try.
Sam :-)
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I vote for the correct filter too.
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Quote:
Originally Posted by JiffyLube View Post
I vote for the correct filter too.
Cheapest thing to try at this point....
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If replacing the oil filter doesn't work, another possibility is that the oil pump has lost it's prime, and that there is an air bubble in the path.

The way to fix that, is to manually prime the oil pump by filling the oil filter full of oil and screwing it onto the engine, or by directly pouring some oil down into the screw fitting that the filter screws onto.

This has happened to me twice, on engines of different applications. It's rare, but it happens.
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Quote:
Originally Posted by BubbleheadMd View Post
If replacing the oil filter doesn't work, another possibility is that the oil pump has lost it's prime, and that there is an air bubble in the path.

The way to fix that, is to manually prime the oil pump by filling the oil filter full of oil and screwing it onto the engine, or by directly pouring some oil down into the screw fitting that the filter screws onto.

This has happened to me twice, on engines of different applications. It's rare, but it happens.
10 x. This is a correct answer.

I doubt it is the new filter problem. All filters have a by-pass safety valve. And I doubt the oil pump fails suddenly. I assume that you replaced with the wt of oil, right.

I would like to hear the final verdict.
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Quote:
Originally Posted by rockDAWG View Post
10 x. This is a correct answer.

I doubt it is the new filter problem. All filters have a by-pass safety valve. And I doubt the oil pump fails suddenly. I assume that you replaced with the wt of oil, right.

I would like to hear the final verdict.
Some filters are diesel specific because of pressure requirements, and I aways fill the new filter with oil before installing.
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Tried everything today. New filter from Napa same as the one that was working previously, filled the filter etc. Still almost no pressure (~2psi). If I disconnect the oulet line above the filter, oil does pump out when cranking. I'm at a loss. Not at all impressed with these Universal engines. Seems to be nothing but problems from what I've read and this experience.
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