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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, 175k mi
06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
2002 Honda Odyssey 244k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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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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Location: IL / WI
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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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Location: Baltimore, MD
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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, 175k mi
06 E320 CDI "Rutherford", Black, 145k mi
91 300D "Otis", Smoke Silver, 129k mi
98 E300 "Murray", Silver, 128k mi, Stage 2 Rocketchip chip tuned, under son's care, getting EXPENSIVE!

Twelve other MB's owned and sold
2002 Honda Odyssey 244k mi (want to name it "Homer," wife won't let me)
1961 Very Tolerant Wife
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  #7  
Old 04-18-2019, 02:07 PM
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Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
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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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$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment
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  #8  
Old 04-20-2019, 11:21 AM
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Location: Wilmington, NC by the Atlantic ocean
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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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124.051
 
Join Date: Jan 2009
Location: IL / WI
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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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Lakemoor, IL
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Chicagoland Mercedes Enthusiast Facebook Group: https://www.facebook.com/groups/mbclubchicago/
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