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 > Your search for posts made by 'MopaRV' found 5 matches.

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RE: Onan Microlite 4000 shaft locks up on occasion

The problem as described by initial poster is caused by starter drive. Onan tech for 35 years+. Have fixed this issue literally dozens of times. have worked on hundreds of Microlite/Microquite gensets, and seen engines lock up due to broken con. rods, crankshafts, balance shafts, camshafts, dropped valves, seized rotor bearings, etc. However, since it can be freed up by jerking on flywheel/blower wheel, and then seems to run ok, would bet the farm on being a starter drive problem. Thanks. I was leaning toward the starter being the problem also. I figure I'd keep going with it for a few more weeks until I have the opportunity to drop the generator for repair. And what might be the issue? Starter gear not retracting? Starter gear broken tooth? Can anything REALLY BAD happen by me continuing to use it with questionable starter drive issues?
MopaRV 04/30/22 02:21pm Tech Issues
RE: Onan Microlite 4000 shaft locks up on occasion

If it has a ridge at the top you’ll have to get it reamed if it still runs good and makes electricity. You can look on YouTube and see ridge on cylinder wall and how they ream them and it may be in your service manual. I've heard of a ridge forming. I should have said I've never heard of a cylinder sticking on it. If you've seen it, I'll take your word for it. I never say never. I can fix most things, but once you start talking engine tear down, I'm out, and would likely just get another generator. Granted he didn’t take care of it as it had 1800 hrs on it. Not sure running 1800 hrs means he didn't take care of it. As I said, I know a couple guys that have had 3000+ hrs and 1 guy that had 5000+ hrs on their Onans (different models). I take care of mine (mostly) and maintain regularly, although I've had carb problems where the cylinders walls were washed out by gas (gas in the oil). And even though I know I shouldn't run it for only a few minutes a day to run a microwave, that's what I do. So who knows, you may be right. I appreciate and listen to any suggestion or theory.
MopaRV 04/27/22 02:20pm Tech Issues
RE: Onan Microlite 4000 shaft locks up on occasion

How many hours on the generator? They get a ridge at the top of the cylinder and get stuck on it. Interesting. I've never heard that one before. I have about 1700 hrs on it. (Low compared to others I know. One guy I know has 5000+ hrs on his) I haven't had any problem since my other post on 4/09/22. When the generator finally breaks for good, I'll know what the problem was LOL. I'm about to end my drycamping in a couple weeks and head to a park for the next 5 months, so no genset needed for awhile.
MopaRV 04/26/22 03:52pm Tech Issues
RE: Onan Microlite 4000 shaft locks up on occasion

I've had almost the same experience. The generator wouldn't turn over to start. I reached in beside the unit until I could feel the motor cooling fins. I was able to turn it by hand a little and it fired up. It's done this a few other times.. It must have something to do with the position it stops..??? I've had the generator in my RV of 14 yrs as a mostly dry camping fulltimer and it's never happened before, and now twice in 1 week?? I was able to break the shaft free again using a wrench. (No way I can spin it by hand like you were able to) It fired up again like nothing happened. The first time after breaking the shaft free, the shaft with cooling fins spun freely, but this second time, the shaft DID spin, but not freely, as if the starter is dragging it? Don't know.
MopaRV 04/09/22 01:49am Tech Issues
Onan Microlite 4000 shaft locks up on occasion

I have an Onan Microlite 4000 generator and the shaft locked up when I powered off. This is a new issue and it runs fine otherwise. Oil level is fine. I broke the shaft free with a wrench on the shaft end with some hard push/pulls on the wrench, and the generator went back to starting and running fine. Then about a week later, the shaft locked up again. This last time, I noticed when I powered off, there was a "bell ringing" sound when the generator came to an abrupt stop, at the end of it winding down.
MopaRV 04/08/22 03:02pm Tech Issues
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