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Old 09-14-2018, 04:18 PM   #1
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Interstate Exhaust Pipe Repair

With just over 100,000 miles on my 2013 Interstate EXT Lounge the exhaust pipe rusted through near the hanger at end of pipe. At first thought I might have to replace the entire pipe behind the SRC/DEF device. This is the insulated pipe that Airstream adds to bring the pipe out the passenger side in front of rear wheels.

On closer inspection most of the pipe is probably good for a few more miles, but the end had completely separated from the rest of the pipe. I got a 12Ē extension pipe from local auto parts store and a couple of 2.5Ē clamps. Pipe at end of break was fairly solid so I slipped the extension on with some exhaust pipe sealer and a clamp. Second clamp attached pipe to hanger that I replaced last year. The insulation was torn some so I wrapped it with aluminum tape and added a screw clamp to keep the insulation in place.

Hopefully this will be good for another 10-20K miles. Then Iíll have to replace the whole pipe. Looking back I may have aggravated the break by adding a heavy chrome tip to end of pipe that added to the stress on end of pipe near hanger.

Here are a few photos of the final results.

Has anyone else had to replace the Airstream installed exhaust pipe yet?
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Old 09-14-2018, 06:47 PM   #2
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Just went out and looked at mine. 2013, 60,000 miles, no chrome tip. All is solid.
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Old 09-14-2018, 07:52 PM   #3
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My taik pipe fell off right at the bracket. Did your new pipe slip over the insulated pipe
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Old 09-14-2018, 07:58 PM   #4
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Originally Posted by Docevil87 View Post
My taik pipe fell off right at the bracket. Did your new pipe slip over the insulated pipe
Havenít tried to remove rusted clamp yet looks like it will be a bitch any suggestions. I see I might have a little bit of pipe behind clamp
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Old 09-14-2018, 08:04 PM   #5
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MIKE - Isn't that premature for an MB part to rust through even at 100k miles? Or is this just the result of winter driving deterioration? Apologies, I have to admit, I have no frame of reference as to effects of winter on cars long term because I left Chicago 35 yrs. ago and during that time, I drove brand new HP Company cars issued to us every 12 mos. All my personal cars never saw an inch of snow/salt. So when I hear things rusting through on relatively young vehicles like yours, I did not expect it.
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Old 09-15-2018, 02:34 PM   #6
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Quote:
Originally Posted by Boxster1971 View Post
With just over 100,000 miles on my 2013 Interstate EXT Lounge the exhaust pipe rusted through near the hanger at end of pipe. At first thought I might have to replace the entire pipe behind the SRC/DEF device. This is the insulated pipe that Airstream adds to bring the pipe out the passenger side in front of rear wheels.

On closer inspection most of the pipe is probably good for a few more miles, but the end had completely separated from the rest of the pipe. I got a 12Ē extension pipe from local auto parts store and a couple of 2.5Ē clamps. Pipe at end of break was fairly solid so I slipped the extension on with some exhaust pipe sealer and a clamp. Second clamp attached pipe to hanger that I replaced last year. The insulation was torn some so I wrapped it with aluminum tape and added a screw clamp to keep the insulation in place.

Hopefully this will be good for another 10-20K miles. Then Iíll have to replace the whole pipe. Looking back I may have aggravated the break by adding a heavy chrome tip to end of pipe that added to the stress on end of pipe near hanger.

Here are a few photos of the final results.

Has anyone else had to replace the Airstream installed exhaust pipe yet?
Attachment 322540
Attachment 322541
It was more likely the cheap, mild steel pipe that Airstream used rather than the chrome tip. I had a polished StSt tip on mine w/ no degradation but didn't drive in the salt season. Also my tailpipe was not insulated.

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Originally Posted by Docevil87 View Post
Havenít tried to remove rusted clamp yet looks like it will be a bitch any suggestions.
Sawzall or cutting torch should do it.
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Old 09-15-2018, 02:45 PM   #7
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Originally Posted by Docevil87 View Post
My taik pipe fell off right at the bracket. Did your new pipe slip over the insulated pipe
I peeled back some of the insulation and the new pipe slipped over the old pipe that was solid at that point. the only way to remove old rusted clamps is to cut them - you cant loosen those old clamp bolts.
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Old 09-15-2018, 02:49 PM   #8
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Originally Posted by Alex AVI View Post
MIKE - Isn't that premature for an MB part to rust through even at 100k miles? Or is this just the result of winter driving deterioration? Apologies, I have to admit, I have no frame of reference as to effects of winter on cars long term because I left Chicago 35 yrs. ago and during that time, I drove brand new HP Company cars issued to us every 12 mos. All my personal cars never saw an inch of snow/salt. So when I hear things rusting through on relatively young vehicles like yours, I did not expect it.
It would be premature if Airstream had used stainless steel for the new pipe they added. But they did not - only standard mild steel. The new Interstates I saw at Hershey this week looked like they might now be using SS pipe - that we be a good change.
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Old 09-15-2018, 02:52 PM   #9
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Originally Posted by 73shark View Post
It was more likely the cheap, mild steel pipe that Airstream used rather than the chrome tip. I had a polished StSt tip on mine w/ no degradation but didn't drive in the salt season. Also my tailpipe was not insulated....
I drove mine to Minnesota in February a few years ago. That guaranteed rust.
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Old 09-15-2018, 03:02 PM   #10
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I lived in Minneapolis for three winters in the early 70s and replaced the exhaust system from the manifolds back twice on my 68 GTO. But that was back when you could only get 18 ga mild steel.
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Old 09-15-2018, 06:22 PM   #11
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Thanks boxster ready to tackle project.
Was at hershey on friday, really liked the LTV murphy bed. If it had 4 seat belts may hsve pulled the trigger.
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Old 09-16-2018, 10:09 AM   #12
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Thanks boxster ready to tackle project.
Was at hershey on friday, really liked the LTV murphy bed. If it had 4 seat belts may hsve pulled the trigger.

Those are exactly the same parts I used. I used some Permatex exhaust sealer in a tube to seal joint. I cut the end of pipe off a bit because I didn't like that sharpe edge of the pipe sticking out near the sliding door.

Next I think I'm going to get a piece of thin aluminum and wrap it over the pipe insulation then secure it with a couple of screw clamps. The insulation near the end of my pipe is seriously deteriorated.
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Old 09-16-2018, 11:41 AM   #13
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Project complete. Thanks boxster. Not sure how long it will last hanger is pretty rusted and remaining pipe had some rust. I like the idea of wrapping it it stainless. Saw that at autozone. May go back and get it. I also used exhaustt cement at joint. Nice 18 dollar repair.
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