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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14487
Experience:  Certified on Onan and Generac generators
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Have an Onan model 125.0 DYD-15R/1A, Serialwith diesel

Customer Question

Have an Onan model 125.0 DYD-15R/1A, Serial(###) ###-####with diesel engine. Engine starts, runs with good oil pressure. After about 15-20 seconds, it shuts down and Lo Oil Pressure light comes on. Oil pressure gauge stays up until shutdown. We have replaced both oil pressure sensors on the engine. Need wiring schematic and some advice on where to start(contacts, board, etc.). Email at***@******.***. Thanks
Submitted: 8 months ago.
Category: Small Engine
Expert:  Hank F. replied 8 months ago.

The first thing you need to do is to remove the oil pressure sender, and install a manual pressure guage to read the actual oil pressure. Do not rely on the built in gauge - it may have gone bad.

You should have a minimum of about 10 psi oil pressure.

Let me know what you get.