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Old 07-24-2015, 09:40 AM   #1
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Diesel Cummins/Onan spark arrestor cleaning?

Manual says clean this every 150 hours. Service guy says don't bother. Any practical experience on how critical it is to do this service step??
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Old 07-24-2015, 10:21 AM   #2
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The spark arrestor is just a small screen to keep sparks from exiting the exhaust pipe and starting a fire if you are in a grassy/forested area. If it plugs your exhaust your generator will run poorly. Removing the plug once in awhile to clean the spark arrestor is probably easier than leaving it in until it rusts in place and then when the screen is plugged not being able to get the plug out. I clean mine.
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Old 07-24-2015, 01:37 PM   #3
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Ratchet with a long extension knocks this out in a few minutes. Easier than changing oil or air filter, why not do it?
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Old 07-24-2015, 03:33 PM   #4
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Do it! Prior to EACH cleaning mine i have experienced rough running and unexplained shut downs.
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Old 07-25-2015, 12:10 AM   #5
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Is the process LOUD? (Sounds like removing the plug bypasses the muffler???)
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Old 07-25-2015, 06:30 AM   #6
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I did not think so! Didnt seem louder than usual. Process takes no more than 15 min.
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Old 07-25-2015, 08:06 AM   #7
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Did mine for the first time, easy after watching RV Geeks Video.
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Old 07-25-2015, 08:34 AM   #8
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Quote:
Originally Posted by MN_Traveler View Post
Manual says clean this every 150 hours. Service guy says don't bother. Any practical experience on how critical it is to do this service step??
The service guy is wrong. It's simple to do and will improve the performance of your gen set.
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Old 07-25-2015, 10:12 PM   #9
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On my 10,000 the problem was having to remove the top of the generator as there was no access panel for the spark arrestor. Seemed pretty stupid to me so I cut a hole in it, and mounted an aluminum plate over top of the hole (having attached the portion of the cover I cut out to the back of the plate so I had the insulation), so now I have 6 screws to remove and the access hole lets me reach in and remove the bolt.
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Old 07-26-2015, 09:52 AM   #10
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It's one of those things that you may never need to do, but can cause weird performance issues if needed and not done. 150 hours for an Onan diesel seems ultra-conservative, though. In my opinion the engine would have to be running mighty poorly to need arrestor cleaning that frequently, so you can probably double or triple that interval without worry. But at the first sign of rough sounding exhaust or less than smooth operation, get out that wrench!

Maybe I'm naive (I don't think so), but all of Onan's maintenance intervals seem extremely conservative.
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Old 07-26-2015, 10:18 AM   #11
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Cleaning the spark arrestor was my last maintenance item on the genset. Just took care of that this morning. 11/16 socket and long extension was a little snug but had it out in 2 minutes ran gen under load for 5 minutes and wait to cool. Very easy process and had a socket full of soot when I took it out.


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Old 07-27-2015, 11:48 PM   #12
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Thank you all !! Sounds easy - and overdue for me. Will perform as soon as we are back from current trip. Southwest in the summer - the genset is definitely getting a workout :-)
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