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Old 08-14-2016, 09:30 AM   #1
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1983 27' Excella
1990 34.5' Airstream 345
Spring Lake , Michigan
Join Date: Jan 2006
Posts: 40
1990 345 GenSet muffler

I was wondering if anyone knows a replacement muffler part number. I was replacing a exhaust manifold, cap rotor and plugs, wires and decided to turn the gen on to run the air . As I started it it stalled and I pushed the start button while it was cycling down and it back fired so hard it blew the round end off the muffler. Of course we have a road trip planned next week. So one more thing on my list lol. Today's plan is master cylinder and all new calipers and rubber hoses. Thanks Click image for larger version

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Old 08-16-2016, 07:24 PM   #2
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1988 34.5' Airstream 345
Ham Lake , Minnesota
Join Date: Aug 2005
Posts: 59
I bought our replacement muffler in 2014 on eBay from anyrvparts. It was listed as "Genuine Onan Generator Muffler 155-1258 " with free shipping. I found two priced just over $70 with a quick search in eBay.

Good Luck.
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Old 08-18-2016, 07:17 AM   #3
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1983 27' Excella
1990 34.5' Airstream 345
Spring Lake , Michigan
Join Date: Jan 2006
Posts: 40
Thanks for the numbers the parts are on the way. I called Onan in Elkhart and what great service and pricing. Should be here today.
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Old 08-19-2016, 12:48 PM   #4
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1983 27' Excella
1990 34.5' Airstream 345
Spring Lake , Michigan
Join Date: Jan 2006
Posts: 40
Back up and running. Here are the part numbers. The 2540 number is a new exhaust manifold adapter. The only used part is exhaust pipe coming out of new muffler. I had to supply my own clamps. My original support piece from the motor to my muffler was broke off the motor so I added my own support after the back muffler clamp. Click image for larger version

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