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  #1  
Old 04-16-2019, 09:42 AM
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How common are exhaust manifold cracks?

Well, my used exhaust manifold for the 98 E300 ships today....will be glad to get my son back on the road. Front brakes, front springs, brake line, AC leak...plus the cracked exhaust manifold....he's in for some sticker shock.

My mechanic commented that he's never seen a cracked manifold on a W210. One very experienced forum member says he's never seen one on a W210 or a W124. But, sure enough, it has a very obvious crack. Wonder what caused it. Bad casting? Some sort of unusual stress over the course of 20 years? I of course wondered about the increased pressure as a result of the tune...but mechanic doubted if that could be the cause.

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06 E320 CDI "Benson", Platinum Blue, 177k mi
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91 300D "Otis", Smoke Silver, 131k mi

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  #2  
Old 04-16-2019, 10:45 AM
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I have been working on W123, 108 and 111 Mercedes cars for over 30 years and have never seen a cracked exhaust manifold. Probably 1 in a million.
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  #3  
Old 04-16-2019, 11:24 AM
is thinning the herd
 
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Location: Columbus, Ohio
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It just a thing that happens ever so rarely on a Mercedes. I've seen a couple over the years but it's hardly common. Seen a 240D crack one, a W115 gasser, and a few others that escape me. Replace it and move on with your life, its unlikely to go again.
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  #4  
Old 04-17-2019, 11:14 AM
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I've only ever had 2 turbo manifolds crack and they were both on G wagens that were missing the support brace underneath the turbos. Check to see if that bracket is installed on the car - usually mounts to the engine support arm and runs up to the turbo.
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  #5  
Old 04-17-2019, 11:32 AM
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Ham Shanker
 
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Was (relatively) cold water ever splashed on the manifold while hot?
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  #6  
Old 04-17-2019, 02:47 PM
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Quote:
Originally Posted by Simpler=Better View Post
Was (relatively) cold water ever splashed on the manifold while hot?
Not to my knowledge....I/we have owned the car since 2013.

I think the crack has been there for a while. When I had some exhaust work done a while back, I could hear the rushing of air coming from that area. I chalked it up to turbo whine and forgot about it. But now I'm confident it was exhaust escaping through that crack.

One stud broke off...so mechanic will have to drill it out. Ug.
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06 E320 CDI "Benson", Platinum Blue, 177k mi
06 E320 CDI "Rutherford", Black, 150k mi
91 300D "Otis", Smoke Silver, 131k mi

19 Honda CR-V EX 2k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #7  
Old 04-18-2019, 02:07 PM
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Ham Shanker
 
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Quote:
Originally Posted by shertex View Post
Not to my knowledge....I/we have owned the car since 2013.

I think the crack has been there for a while. When I had some exhaust work done a while back, I could hear the rushing of air coming from that area. I chalked it up to turbo whine and forgot about it. But now I'm confident it was exhaust escaping through that crack.

One stud broke off...so mechanic will have to drill it out. Ug.
Mechanic should be welding a nut to the broken stud and then easily extracting. It's super easy.
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  #8  
Old 04-20-2019, 11:21 AM
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I have 3 OM617 turbo manifolds and all are OK. That's a fairly small data set but it IS something.
Dan
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  #9  
Old 04-20-2019, 12:48 PM
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Quote:
Originally Posted by Simpler=Better View Post
Mechanic should be welding a nut to the broken stud and then easily extracting. It's super easy.
Ah, the internet.
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  #10  
Old 08-02-2019, 02:02 AM
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Repair is behind us...car running beautifully again. I still wonder about the possibility of the tune contributing to the crack. Exhaust gas temps are certainly higher...by how much I don't know. But it seems that that had to add at least some thermal stress to the manifold over time. Oh well...
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06 E320 CDI "Benson", Platinum Blue, 177k mi
06 E320 CDI "Rutherford", Black, 150k mi
91 300D "Otis", Smoke Silver, 131k mi

19 Honda CR-V EX 2k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #11  
Old 08-02-2019, 04:56 PM
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the possibilities are

warped manifold
wrong torque on the nuts
reused gaskets (causing wrong crush)
missing brackets (vibration)
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  #12  
Old 08-03-2019, 01:36 PM
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Quote:
Originally Posted by Zulfiqar View Post
the possibilities are

warped manifold
wrong torque on the nuts
reused gaskets (causing wrong crush)
missing brackets (vibration)
So I guess that would rule out the tune.
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06 E320 CDI "Benson", Platinum Blue, 177k mi
06 E320 CDI "Rutherford", Black, 150k mi
91 300D "Otis", Smoke Silver, 131k mi

19 Honda CR-V EX 2k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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  #13  
Old 08-05-2019, 11:12 AM
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I have no personal experience but my general knowledge of mb suggests to me a missing bracket or something similar.

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..I also have a 427 Cobra replica with an aluminum chassis.
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