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Universal M18 leaking oil / low oil pressure

• Thread starter adamv
• Start date Sunday at 3:38 PM
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Ralph Johnstone

smokey73 said: That line that Ralph asked about looks an awful lot like a sensor line for a manual oil pressure oil pressure (non electric). Click to expand

adamv said: As its a switch, i am assuming the PO didn't like not having a guage and added the box as an upgrade that later failed catastrophically (note the wobbly reconstructed side) Click to expand

adamv said: Could this be with a 3 pin sender which sends pressure signal and a 8 psi warn? Click to expand

If you are concerned with the block modified by the PO you can probably replace the block with a more compact Tee as long as the block doesn't serve some other function. I'll post some pictures of what I did with my Yanmar later.  

smokey73 said: I'll post some pictures of what I did with my Yanmar later. Click to expand

Not so much a Yanmar vs Universal engine issue. Just an example of how an adapter or T could replace the big, clunky "box" as you suggested My adapter had one male BPT that fit into the location of the original pressure sensor. (ordered from McMaster Carr). Yanmar used BPT threads for the OEM sensor. The adapter had two NPT female connections. I put in the replacement (non-OEM) sensor with male NPT connection into the adapter. The matching electric oil pressure gauge was placed at the helm where the original oil pressure gauge was. I also atached a metal weave female NPT oil line hose into the other NPT female location. I then ran the oil pressure sensing line to a mechanical gauge I put in the engine compartment (it is there for reference to the electric gauge at the helm should I think I have a problem.) The poster could adapt the same concept hooking his adapter into the original location of the oil sensor which now has a hose that feeds the block.  

Could very well be. All depends on just what's hidden in that Pandora's box. Unless it serves some unseen purpose, I would say it's got to go.  

smokey73 said: Where is that gauge installed? It does not appear to be located on the standard instrument panel shown in the link from @kloudie1 . Find that gauge and see if it has a solid line, not an electrical wire, feeding it. If all of the above is correct and the pressure on the gauge behaves as you have stated (drops slowly from 45 to 20 pounds as the engine heats up) and drops to 0 when at idle after that and the buzzer comes on that indeed, it is most likely you have a REAL low oil pressure situation. Two different indications, one electrical and one mechanical gauge both say you have low pressure - Believe your indications. Click to expand

@smokey73 . is your number one picture upside down ? Can't get my head around where we are. Do you have anything taken from farther back ? Also, is your adapter the hex tube with a 1/8" NPT hole in the side ? Looks good but would look even better from further back.  

adamv said: but i understand that lower oil levels do result in lower readings. Click to expand

adamv said: The thicker line people are suspecting is mechanical seems too flexible to be mechanical Click to expand

@Ralph Johnstone No, picture 1 is not upside down. It is looking down from the front of the engine. Can't really take from much further away as "things" clutter the picture. The oil filter is just behind the fitting and is horizontal to the engine. The sump can be see in the center at the bottom of the picture. Yes, the hex tube is the adapter bought from McMaster Carr. It has male BPT threads to fit into OEM connection on the Yanmar and then two 1/8" NPT female threaded locations for the aftermarket sensor and mechanical gauge connection. The replacement sensor is the shiny silver cylinder with the electrical connection. The 1/8" fitting with the teflon tape and metal reinforced hose is the hose to the mechanical gauge in picture 2. I liked to have the independent oil pressure confirmation of the mechanical gauge that I can refer to when I suspect there is question with the electrical gauge. It is a lot less subject to wire resistance or connection issues like a electrical sensor. I agree that what looks like the instrument tubing is not a good choice. That is why I used metal reinforced metal hose that is often used for turbocharger oil supply tubing in race cars.  

After dislocating my neck trying to figure why your electric pressure sensor is in a different position and why the oil filter is in the wrong position, I conclude your Hunter 40.5 does not have a Yanmar 2GM. Moving right along here, yes, your arrangement is the best for two different points of presure sensing. As I mentioned in post #22, somewhere out there exists a sensor which acts as a pressure sensor for a readout and a pressure switch for an alarm. I'll find it later on or I won't be able to sleep tonight.  

Ralph Johnstone said: View attachment 227436 Click to expand

OKay so one line is the buzzer and the other is a mechanical tube - I can see the oil leading to the guage. You can see replacing these guages and sealing the panel has been on my list for a while. I'm going to spend some proper time on the boat at the weekend - it will then be in its home for the winter and I can safely open up the box, take measurements, clean up the ER and order the new guages. I'm assuming switching to all electric would be better wouldn't it? I hate the idea of a flimsy tube carring oil half way across the boat.  

Attachments

adamv said: I hate the idea of a flimsy tube carring oil half way across the boat. Click to expand

Ralph Johnstone said: After dislocating my neck trying to figure why your electric pressure sensor is in a different position and why the oil filter is in the wrong position, I conclude your Hunter 40.5 does not have a Yanmar 2GM. Moving right along here, yes, your arrangement is the best for two different points of pressure sensing. As I mentioned in post #22, somewhere out there exists a sensor which acts as a pressure sensor for a readout and a pressure switch for an alarm. I'll find it later on or I won't be able to sleep tonight. Click to expand

360-006 - VDO Sender Pressure 80PSI - 360-006 - VDO - automotive gauges - Vehicle Controls

smokey73 said: I personally don't like like the idea of one single sensor providing two functions. I removes the concept of redundancy. Click to expand

Great find. I like VDO gear. The OP has some pretty good ideas for sorting out his issues and hopefully will first determine if he has an actual low pressure condition before he proceeds much further. I think he does but time will tell. I think we have about exhausted this subject too. OUT  

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