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Old 22-08-2015, 18:35   #1
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Onan-Cumming 7MDKBL

Hello everyone,

I have a six year old Onan-Cumming 7MDKBL generator with 880hours on the clock, on my boat.
We live aboard and use the gennie nearly every day to both charge batteries and run some of the heavier loads on board.

A week ago it suddenly stopped with the amber light flashing twice every few seconds.
The manual says "Low oil pressure" so I replaced the oil and filter, but it was no fix.
The filter was original, the oil Rotella-T 15W-40.

When cold, it starts ok, runs for about 15~20 min and it stops, no splatter or coughing, stops as if I pushed the stop button.
It would start agai, but only run for a couple of minutes.

I guess the oil sensor or wiring is causing this problem when the engine is hot, but cannot find the fault.

Can any of you help?

many thanks for reading so far.
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Old 06-09-2017, 15:35   #2
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Re: Onan-Cumming 7MDKBL

Sorry I can't help you but maybe you can help me. I have a Onan mdkbl. What do you use to remove the impeller. There is not a lot of room in there.
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