Re: Intermittent Generator Shutdown
Reply #5 –
Yahoo Message Number: 116292
I have no experience with this generator, only having used the QD8000. Does your unit also have an auto shutdown from the temp sensor reporting too high a temp? We had quite a problem with the QD8000 (And I believe other QD's too, at least the QD7500 I've heard had this problem too.) The temp sensors used by Onan, had incompatible metals with where they were threaded into the unit to pick up temperatures. The result was chemical in nature, and would damage the temp sensor unit and cause false reports of overheating. (Onan eventually came out with a revised/improved temp sensor, avoiding the metal mismatch caused problems.)
While I doubt in your age generator that you have a problem with incompatible metals, I did have one out of the three older unit sensors, be faulty at installation. (I bought the coach, and would get the overheating error coded '33', and the unit would shut down. Replaced number 1 sensor. That sensor within 14 months, also started sending out false overheating error codes, and would shut down the generator. So replace number 2. This sensor would allow the generator to start up, but after about 25-35 minutes, it would shut down again, due to error code 33. This took lots of debugging, until I finally convinced Cummins parts that I felt the sensor was getting up to a temperature point from the generator running, and then faulting out - a defect. So I made a deal to have them put in another sensor, number 3, and test run the generator. It ran for 4 hours, before they turned it off. And did a no charge for the replacement sensor. (Oh, sensor number 3 went out, but luckily at same time we ended up replacing the generator's radiator, as it could not be cleaned out. (Previous owner had neglected the service, and my attempt of two different flushing did not work. Unit would run warm, and in temps above 105 - would not stay cool enough. Radiator shop we sent to, tried all their tricks to deep flush, but it was to crystalized in places. So new radiator, thermostat, hose, fan belt - and Temp Sensor number 4 - but this was the new and improved unit. I bought two of them. And I A/B'd both sensors in (As the new sensor had not been out long enough to see if it would work for the long haul.) One sensor, was installed per normal, and is the A side of my switch inside the coach. The B side of the switch, hooks to a sensor that I metal C clamped to the return housing to the radiator. So once the unit ran long enough on A, if it did shut down, usually at least a run of 5 minutes. Then I could switch to B, and get the signal to the brain that all was OK. After being caught without shore power in Bishop, CA at 112 or so outside - and a non running generator for the roof AC's - I wanted extra insurance to avoid this in the future. So if I ever get a shut down of the generator for Code 33 overheating. I'll validate oil and coolant are in good, switch to B feeding Temp Sensor - and feel relatively confident that I'm safe to do so.)
So a long message, as it may help someone down the road with an older QDXXXX generator. And to the OP, my though is maybe you got a bad temp sensor with our recent work. Like I did with my Temp Sensor number 2. Thus the reason for posting, if your generator has a shut off due to High Temp?
And yes to the tip on older rubber fuel lines not playing well with ULSD fuels. If it has not been replace, replace it anyways. As ULSD will cause deterioration of the rubber, and can lead to porosity pin hole leaks. Allowing air, and worse, could leak fuel. Fires have been caused by this. The new fuel lines, are compatible with ULSD. Took about 12-18 months to see this after the switch to ULSD. Should have been, IMO, a mandator recall - as RV's have been lost due to fires from this problem.
Best of luck to you,
Smitty
04 Allure 31017 with QD8000
(Running well now, 500 hours plus on the unit since the last Temp Sensor and new radiator were installed. Also went with Final Charge for the coolant, and it too is going strong.)
Topic: Intermittent Generator Shutdown (Read 2364 times)
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