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Old 05-28-2016, 04:34 AM   #1
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Spark arrest or clean out on genny

The Onan genny on our MH says to remove the plug on the spark arrestor every 50 hrs and run it at nearly full load for 5 min. I finally got the right socket to do the job and did it. The plug is naturally hard to get out as one would expect. How many RV owners actually do this on a regular basis?
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Old 05-28-2016, 04:50 AM   #2
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Copper-based anti-seize compound on the threads may help. It's made for high-heat applications.
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Old 05-28-2016, 05:21 AM   #3
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Originally Posted by georgelesley View Post
The Onan genny on our MH says to remove the plug on the spark arrestor every 50 hrs and run it at nearly full load for 5 min. I finally got the right socket to do the job and did it. The plug is naturally hard to get out as one would expect. How many RV owners actually do this on a regular basis?
I do it at oil changes. It was difficult to remove the first time, but has been easier since.
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Old 05-28-2016, 04:09 PM   #4
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I did it once on my previous coach. It had 2 square head plugs in the muffler. It was impossible to get to one of them. Anyway after driving all over half the county, I found an 8-point socket that would fit the plug. I had to resort to my 1/2" Air impact wrench to get the plug out. So what happened? Ran the engine with a piece of cardboard on the ground under the generator. NOT ONE SPEC OF CARBON. I won't be doing that again.
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Old 05-28-2016, 05:34 PM   #5
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I did it once on my previous coach. It had 2 square head plugs in the muffler. It was impossible to get to one of them. Anyway after driving all over half the county, I found an 8-point socket that would fit the plug. I had to resort to my 1/2" Air impact wrench to get the plug out. So what happened? Ran the engine with a piece of cardboard on the ground under the generator. NOT ONE SPEC OF CARBON. I won't be doing that again.
I didn't see any carbon either. I wonder if it is really useful.
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Old 05-29-2016, 07:07 AM   #6
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I have done mine 3 or 4 times in the 13 yrs we've had the coach. I got a dusting of carbon a time or two.
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Old 05-29-2016, 08:02 AM   #7
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I do it every two years when I change all fluids and filters. I use a deep socket with a piece of 3/8" rubber hose that holds the plug out so that only the threads show. This makes the plug reinstall much easier.

Yes, I use antiseize on the threads as well.
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