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Old 05-19-2019, 09:58 PM   #1
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THOR #6826
Onan spark arrestor

Serviced my generator today and noticed that Iím supposed to clean the spark arrestor every 50 hours. Iím about 100 hours overdue! Thereís a square head bolt/plug in the exhaust that needs to be removed and it wouldnít budge with my Crescent wrench. Needs a proper tool but I didnít measure it and now the coach is back in storage and I want to order a suitable 8point socket. Does anybody know the size? Thanks
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Old 05-20-2019, 12:04 AM   #2
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It probably is a 3/8" pipe plug (square head pipe plug). Since it is brass, you will probably round it if you use a 1/2" open end wrench. Amazon sells pipe plug sockets.


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Old 05-20-2019, 12:23 AM   #3
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Originally Posted by Beau388 View Post
It probably is a 3/8" pipe plug (square head pipe plug). Since it is brass, you will probably round it if you use a 1/2" open end wrench. Amazon sells pipe plug sockets.




Yup, thatís the one. I was fearful of rounding it with my adjustable and figured it was good and stuck. Thanks.
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Old 05-20-2019, 04:25 AM   #4
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Get some Blaster PB Penetrating lub.

Spray and let it work for a while, should come right out.
Most auto supply, WalMart have it or Amazon.

https://www.amazon.com/Blaster-PB-PE...s%2C220&sr=8-3
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Old 05-20-2019, 02:10 PM   #5
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THOR #11130
Quote:
Originally Posted by abjbrtd View Post
Get some Blaster PB Penetrating lub.

Spray and let it work for a while, should come right out.
Most auto supply, WalMart have it or Amazon.

https://www.amazon.com/Blaster-PB-PE...s%2C220&sr=8-3



^^^Ditto^^^on this method. After it has sat for a while soaking, give it one reasonably good smack, straight downward on top of the bolt with a light hammer.
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Old 05-20-2019, 08:07 PM   #6
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yep, don't use an open end wrench on it....Mine is a bit rounded I'm sad to say... and I gave up before ever getting the thing off.
I can't say I knew about a special socket for it.
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Old 05-20-2019, 09:32 PM   #7
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Appreciate all the advice. I measured it today and it appears to need a 7/16 inch 8 point socket. $6 on amazon.
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