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Old 10-09-2017, 02:24 PM   #11
Rich Biebel
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Default Re: Onan 4000 ky no start

Tony.....The rotor is shown as not available on Cummins website.....and sells for over $500....

If the machine was in good condition and not a mess like some I see the cost to replace that rotor and probably a few other items would push the repair cost to at least $750. Assuming it is the rotor and replace the brushes at the same time.....and make sure it is running right and adjusted as well as possible....

At work I use a load bank tester to adjust a machine for best operation.

Those machines have a service life and since they run at 3600 rpm the engine gets worn over time. I shy away from doing any major repairs on one if it looks to be in rough shape....Not worth it.....

I really don't do side work anymore......
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Old 10-09-2017, 02:34 PM   #12
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Default Re: Onan 4000 ky no start

Originally Posted by tonym View Post
Thanks again, Rich
The unit is out of trailer and in my pickup. If you do any work on the side I can drive it to your place and leave it. I suspect I am only an hour or so away.
Assuming that's the problem can you give me a rough estimate to fix it . I don't want to put a lot of money in it if its not worth it.
Thanks so much

Hey, that's not cool to put Rich in a pickle like that. The man makes his living working on gen sets and freely offers helpfull advice on a regular basis. Don't ask him to sidestep his employer, even if he owns the company.
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Old 10-12-2017, 01:15 PM   #13
Jim Wahl
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Thumbs down Re: Onan 4000 ky no start

Had a Onan Quiet 4000 in my Class C RV and had nothing but problems. Not starting and shutting off whenever it felt like it. Had it in to the Onan repair dealer 6 times in 3 years. Lucky to have a good shop here in Orlando. Many racers I have spoken to have had the ame problems with those models. The last (and final) time it broke a rod! That was it for me. Traded it in for a class A with a 6500 Onan and never looked back! Jim

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