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Old 12-18-2020, 02:46 PM   #1
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Diesel generator severe engine problems

This is on a Onan 10K gen in a 99 Beaver Marquis. Gen has 560 hours total. It has the Isuzu engine.

I would like to know if anyone has ever had one of these diesel generator engines rebuilt. Gen did auto shutdown then was hard to turn over and smoked badly. Found that one cylinder is scored because of a leaky fuel injector washing away the lubricant in the cylinder. The shop is trying to find someone to sleeve the cylinder. I was wondering if anyone has ever been through something similar with a similar generator. I'm debating whether it's smarter to buy a new generator for 11-12K instead of pouring money into an old unit that hasn't been used as much as it should have been.
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Old 12-18-2020, 02:58 PM   #2
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I think I'd be looking at a new one. Doubtful they'll find a sleeve.
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Old 12-18-2020, 03:36 PM   #3
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I would start researching RV salvage yards. There should be a lot of gently used generators available from wrecked or burned coaches.

Here's a start:
https://generators.visonerv.com/cgi-...orsforsale.pl?
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Old 12-18-2020, 05:17 PM   #4
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X2 on used.
Good luck with it.
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Old 12-18-2020, 07:30 PM   #5
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Thanks for replies. I’ve found a couple of used ones at salvage for around $8k. Then I’d be back to the same place I started. Sounds like it probably isn’t likely to be able to rebuild. From what you guys are telling me, I think I’m going to price a new one. Thanks for opinions.
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Old 12-21-2020, 09:40 PM   #6
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Mr D is correct. A sleeve wasn't possible, or at least not practical, rendering the engine useless. I ended up ordering a new generator for about $3,000 more than a used one would have cost. I didn't mention in my original post that I had all of the 5 year maintenance done and afterward is when the engine failed. This maintenance was very expensive, mostly for labor.

For others who may be looking at a similar situation: I spent a lot of money getting to the point of realizing I needed a replacement. In hind site, a generator specialist told me beforehand that a generator this old isn't supported by the manufacturer any longer, so if certain things happen, you are dead in the water. At the time, I didn't think much of what he was saying because the generator was running perfectly. This generator is mounted in a very hard to access spot on the driver's side of the motorhome. It costs big to remove it to do the 5 year + maintenance, such as change the fan belt. For others who have a 15-20 year old generator, you may want to weigh the risks ahead of time and make a calculated decision. I ended up wasting about $6,000 on the old generator in parts and labor. If I had it to do over, I'd just change the oil myself and run the old unit until it died and then buy new. Once again, thanks for all of your input and perspective.
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