HoyeTractor
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Interesting. Is that with the engine running? If not, the oil light would be glowing even without pushing the button.
YM2310D Oil Pressure LIght
- Thread starter tonyg2160
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Interesting. Is that with the engine running? If not, the oil light would be glowing even without pushing the button.
California
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You got NO light when the wire wasn't properly connected to the sensor. ... And I can't reconcile your experience with what I saw.
On the YM240, I drove into a downed tree to pick it up and carry it away. A branch poked the sender wire, tearing it off. The oil pressure warning light came on.
I drove back to the barn with the light on, that was un-nerving even though I knew the cause.
Spliced the wire and the system went back to normal, light on only before the engine fires off and runs up the oil pressure.
On the YM240, I drove into a downed tree to pick it up and carry it away. A branch poked the sender wire, tearing it off. The oil pressure warning light came on.
I drove back to the barn with the light on, that was un-nerving even though I knew the cause.
Spliced the wire and the system went back to normal, light on only before the engine fires off and runs up the oil pressure.
California
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Not on-topic but I'll post this for some future reader who searches 'Yanmar oil pressure light'.
The sender to drive the warning light seems to be universal across many Japanese cars. So long as it has BSP, British Standard Pipe thread (widely used in Japan) it will work, but don't get the very similar one with USP threads.
Long ago I posted a thread about apparent low oil pressure and someone (Norm?) suggested the sender was far more likely. When I put on a test gauge the pressure was 30~35 psi, normal, so the apparent 'low oil pressure' was in fact the failed sender. Thanks Norm.
The sender to drive the warning light seems to be universal across many Japanese cars. So long as it has BSP, British Standard Pipe thread (widely used in Japan) it will work, but don't get the very similar one with USP threads.
Long ago I posted a thread about apparent low oil pressure and someone (Norm?) suggested the sender was far more likely. When I put on a test gauge the pressure was 30~35 psi, normal, so the apparent 'low oil pressure' was in fact the failed sender. Thanks Norm.
If the sender "sees ground" to display a warning light, and oil pressure "opens" the switch to remove ground and turn the light off, wouldn't disconnecting the wire "remove ground" and turn the light off? After reading Aaron's post above, I believe mine is now (since re-connecting) "ON" with key on engine off, then after starting, the switch "sees" pressure and opens to turn the light off. I do think (going to double check this evening) that pressing the "check" button with engine running will turn ALL 4 warning lights on to confirm function. Maybe the 240 is "normally open" instead of "normally closed"?
HoyeTractor
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I wonder if maybe the wire came loose and touched the frame or something?
From the YM240 service manual....
California
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I guess I have an unexplained mystery. I saw the light on steady as I drove back to the barn, over rough ground that would have jiggled an intermittent ground. My instincts were saying 'Stop and investigate the failed oil pressure, save the engine!' while I kept telling myself the light on meant nothing. Heck maybe I dreamed that the following night!
essimist:In this photo the splice is where it broke.
Also - looking for that photo I found it is in the thread where I documented my temperature readings at the head, pan, etc - for anyone interested.
Re: Low oil pressure? No, bad sender!
Alright...I checked mine and Aaron is correct. When I turn the key on, the Alternator and Oil Pressure lights come on. Once engine starts and the sender see oil pressure the oil light goes off. As an aside, the alternator light doesn't go off until I get enough RPM to start charging the battery. When running, if I press the "check" button only the "battery" light and the temp lights come on.