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Old 08-15-2019, 11:03 PM   #1
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Quieting the Cummins genset

Just bought a 2020 Winnebago 24D view with a Cummins 3k diesel genset. The gen is "tinny" sounding and quite noisy overall. Anyone "quieted" their generator?
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Old 08-16-2019, 11:59 AM   #2
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Keep in mind that the generator needs air to run and keep cool. Any effort to reduce the noise would have to focus on insulation on the coach surfaces near the generator and not disrupt its air supply. I am confident that you will get used to it and if it is running the AC, might just notice it is noisy as well. Congrats on the new coach!
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Old 08-16-2019, 12:41 PM   #3
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First generator? Your generator meets all USFS specs for quietness. You can get a Genturi to deflect the exhaust and some of the noise. Other than that, learn to live with it - you will barely hear it after you turn on the A/C.
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Old 08-16-2019, 09:59 PM   #4
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My previous 2 coaches were diesel pushers with 10k Cummins diesel gensets. These generators were substantially quieter. Yes, the air units were quieter too. The smaller genset is very common in many makes and models. I was hoping that there was some remedial action that others had done.

Would a genturi have any affect? I had one on several previous coaches and they were useful for deflecting exhaust but not quieting things down.

Would a muffler change of some sort help?
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Old 08-17-2019, 08:34 AM   #5
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If put your hear down by the exhaust you hear relatively minimial noise. Majority of the noise is radiating from the unit itself.
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Old 08-18-2019, 10:34 AM   #6
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There is some exhaust noise but the bulk of it is localized to the genset. I opened up the access hatch and it is very loud. Most annoying is a high-pitched rattle from the unit. Is this characteristic of this model?
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Old 08-18-2019, 10:44 AM   #7
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Loose bolts perhaps? A tinny sound may indicate things vibrating against each other that shouldn’t. Check for any obvious loose covers on genset.

Just my guess, Terry
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Old 08-18-2019, 05:18 PM   #8
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Quote:
Originally Posted by bobmac View Post
Keep in mind that the generator needs air to run and keep cool. Any effort to reduce the noise would have to focus on insulation on the coach surfaces near the generator and not disrupt its air supply. I am confident that you will get used to it and if it is running the AC, might just notice it is noisy as well. Congrats on the new coach!
It's time to invoke the warranty!!!
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Old 08-18-2019, 05:54 PM   #9
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Originally Posted by luvlabs View Post
you will barely hear it after you turn on the A/C.
So true
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Old 08-21-2019, 10:45 PM   #10
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Check the exhaust hangers. Sometimes they are installed crooked and make that tinny metal on metal noise. Just had my 4K dropped to service a cover that was installed incorrectly at the factory. The tech twisted the u bolts on the hanger during reinstall. It now has a nasty rattle noise. The rubber in the hanger should absorb vibration. If it is crooked metal on metal noises can happen.

Surprisingly, all techs are not talented enough to spot little things like that. Some people prefer to buy used because those of us that care, fix a lot of manufacturing defects.
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