On my 1968 31 Commander my oil pressure gauge pegged out today when I switched on the ignition and it stays there?? A new wrinkle. We did some crawling around the engine last couple times to the boat. Thinking we may have gounded a wire or knocked it off. Doesn’t seem like excessive pressure if the gauge pegs without the engine running. Can someone tell me where the sending unit is typically located? Does the sending unit fail full on or off? Anyone tell me the standard colors for the sending unit on the engine terminal block ? Ran the engine for 30 min no issues, no overheating. Just gremlins!
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I had an answer written until I tried to add this picture. I think this is the pressure unit that sends the signal to the gauge.
Where is it located Tim? I can check it with my meter.
On a Q engine it’s located on the right hand side of the block, forward, near the flywheel, and just above the oil pan flange.
Steve so on my port engine it’s outboard or inboard? I will try to find it with a mirror , I don’t think I can get in there?? Any idea what kind of ohms I should read on it?
On the port engine it’ll be on the inboard side. Tucked behind the raw water pump. A few days ago I could have walked into my garage and gotten a photo for you. But the engines are back at the yard waiting to be re-installed. I don’t see an indication of the ohms on my wiring diagram (for my 1972 28’) but it calls out a 14 gauge black wire going to the sender.
How about to the terminal block?
Does anyone have a current replacement part number on this oil sender?
Oil pressure switch has two wires (because I added electric fuel pumps), oil pressure gauge sender has the single wire. Both behind the seawater pump. My engine parts list doesn't seem to have a part number for either, but my wiring diagram has part numbers that might work.
That is the drawing I need… where do I find a copy to down load?
Hi John, Here is one you can download - From Resources Manuals & More
You can just copy that pic, it is the same one I sent to Charlene. Not sure if the PDF is higher resolution?
Thank you all
Thanks for the tip will do… I am running 327/350 and its the port engine so I can do that fairly easy.