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Old 06-28-2018, 04:19 PM   #1
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Default DPF/KAT cracked at top of flex pipe.

Did a pre-purchase inspection for an '07 Sprinter with 130k miles. MB of Draper UT did the inspection. "DPF/KAT cracked at the top of the flex pipe." Quoted repair cost of $1,600. A non-MB mechanic said it could likely be welded instead, thus saving a lot of money. But some other posts I've read I think indicate how tricky it can be to get a tight seal with the weld.

Anyone have suggestions or thoughts?

(Also, presume I need to replace the particulate filter as well).

Thanks!
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Old 06-28-2018, 04:34 PM   #2
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Default Re: DPF/KAT cracked at top of flex pipe.

I would replace flex pipe with OEM parts. Fix proper, fix it once. Why do you believe you need a DPF? However, I would negotiate price with the expectation it does. Most likely beyond its service life and improved in 11-years.

Last edited by Bobnoxious; 06-28-2018 at 04:39 PM.
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Old 06-28-2018, 08:11 PM   #3
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Default Re: DPF/KAT cracked at top of flex pipe.

Quote:
Originally Posted by rmcquet View Post
Did a pre-purchase inspection for an '07 Sprinter with 130k miles. MB of Draper UT did the inspection. "DPF/KAT cracked at the top of the flex pipe." Quoted repair cost of $1,600. A non-MB mechanic said it could likely be welded instead, thus saving a lot of money. But some other posts I've read I think indicate how tricky it can be to get a tight seal with the weld.

Anyone have suggestions or thoughts?

(Also, presume I need to replace the particulate filter as well).

Thanks!
I fix this all the time.
You will need a 2,50 inch flex pipe by Walker cost about $100.
Buy one that has tube extensions at either end which you will trim to fit.
Remove the steady bracket , to allow easy stinger access and weld it in making sure you don't touch the flex bubble crimp section of the flex pipe .
Job done for about $250 at a zorst shop,
Dennis
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Old 06-28-2018, 08:57 PM   #4
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Default Re: DPF/KAT cracked at top of flex pipe.

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Originally Posted by lindenengineering View Post
I fix this all the time.
You will need a 2,50 inch flex pipe by Walker cost about $100.
...
Dennis
Flex... some give... what a novel idea. I'll bet your fix outlasts the sturdy new design super duper MB replacement parts.

vic
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Old 06-28-2018, 09:03 PM   #5
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Default Re: DPF/KAT cracked at top of flex pipe.

Well Vic
It works and is a way of saving what is an expensive exhaust component repaired to live another day .
Cheers Dennis
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Old 06-28-2018, 09:23 PM   #6
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Default Re: DPF/KAT cracked at top of flex pipe.

Dennis your shop motto shoud be: Semper Gumby (Always Flexible) .
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Last edited by Old Crows; 06-28-2018 at 10:00 PM.
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Old 06-28-2018, 09:37 PM   #7
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Default Re: DPF/KAT cracked at top of flex pipe.

To deviate from OEM is utter Sprinter blasphemy! Don't you gents have any scruples? I would like to see pictures of these Mickey Moused flexiamajigs?
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Old 06-28-2018, 09:39 PM   #8
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Default Re: DPF/KAT cracked at top of flex pipe.

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I would like to see pictures of these Mickey Moused flexiamajigs?
http://www.walkerexhaust.com/product...universal-pipe
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Old 06-28-2018, 09:43 PM   #9
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Default Re: DPF/KAT cracked at top of flex pipe.

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Dennis your shop motto sboud be: Semper Gumby (Always Flexible) .
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Old 06-28-2018, 09:47 PM   #10
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Default Re: DPF/KAT cracked at top of flex pipe.

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I am sorry, I should have said inspect the welds. Perfect and pretty weld beads are important to me. And the "won't see it" remarks don't cut it.
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