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Old 05-29-2016, 10:49 PM   #1
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Spark arrestor maintenance

Anybody ever cleaned the spark arrestor on an Onan QD12500 diesel generator? Manual says it should be done every 150 hours and I can't even find the muffler on this thing lol.
Of course the gen is hard mounted into the coach so I cant take the enclosure off unless I remove the gen from the rig-handy,huh.
Your help is appreciated.

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Old 05-30-2016, 05:11 AM   #2
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You should not have to open unit, craw underneath and it way up inside try google.

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Old 05-30-2016, 08:20 AM   #3
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Did it yesterday on my onan 7500. Crawl under and follow the exhaust then look up at the muffler. Mine has an 11/16 bolt. You'll need a couple of ratchet extensions to reach up there.
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Old 05-30-2016, 08:55 AM   #4
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Check out this video for servicing the generator. It should be fairly applicable to yours. A couple nice tips in it, especially about the spark arrestor.

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Old 05-30-2016, 10:16 PM   #5
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Thanks for the suggestions. The 12500 is a different beast than the 7500 as the muffler is inside the enclosure. Crawled under late today and noticed a bolton side panel, will take it off tomorrow and check it out and report back.
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