GLK-Class (X204) Produced 2008-2014

conflicting reports...

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Old Sep 17, 2013 | 09:48 PM
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Fj cruiser 2014 GLK250
conflicting reports...

Looking at specs on the GLK 250 I see some reports as the engine is All aluminum and some report it as Iron block and aluminum heads. Just curious those that have one do you know which it is...
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Old Sep 18, 2013 | 03:52 PM
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I don't think I have ever heard of a diesel with an aluminum block...
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Old Sep 18, 2013 | 06:57 PM
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Fj cruiser 2014 GLK250
Originally Posted by rmfnla
I don't think I have ever heard of a diesel with an aluminum block...
The 3 litre V6 diesel is aluminum (I think since 2005-2006) but I've seen conflicting reports of the 4 cyl diesel... I guess I may have to wait till mine gets here then I'll know for sure... not that it makes any real difference...
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Old Sep 20, 2013 | 03:35 PM
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2013 GLK250BT
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One of the US car magazines described it as iron block with aluminum head. That said, they could be right or could be wrong.
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Old Sep 20, 2013 | 05:22 PM
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Originally Posted by Cwdawson
Looking at specs on the GLK 250 I see some reports as the engine is All aluminum and some report it as Iron block and aluminum heads. Just curious those that have one do you know which it is...
Typically diesel blocks are constructed of iron. MB's website simply describes the engine construction as "diecast alloy block and heads", which is the same description they provide for the V6 which we know is aluminum. "Alloy" by definition is a mix of metal components. I believe iron is a pure element (carbon is added to make steel), so I guess the question is: can iron be described as an alloy - at least to benefit marketing? Or maybe it's simply a typo? Everything I recall reading indicated the block was iron. The gross vehicle weight indicates the diesel engine must weigh as much as the V6 if not more, which is further indication that the block is not aluminum.

Originally Posted by rmfnla
I don't think I have ever heard of a diesel with an aluminum block...
Mazda's Skayactiv diesel is all aluminum. It runs a low (for a diesel) 14:1 compression ratio so the components can be lighter. It also doesn't require Adblue or other exhaust aftertreatments.
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Old Sep 20, 2013 | 08:02 PM
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This site which is not an official MB site, but appears to have an in with Daimler Benz, says that the block is cast iron and the cylinder heads aluminum. The oil pan and rocker cover are made of plastic! I saw same information on a French MB site. Scroll down the page and choose this link. If you use Google Chrome, it should translate if you don't understand French.

Last edited by 107123210; Sep 20, 2013 at 08:12 PM.
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Old Sep 20, 2013 | 09:17 PM
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Originally Posted by 107123210
This site which is not an official MB site, but appears to have an in with Daimler Benz, says that the block is cast iron and the cylinder heads aluminum. The oil pan and rocker cover are made of plastic!
Thank you for quoting my website. FYI, all our pages and posts are from original Daimler publications exclusively. We only add unit conversions from metric to US as needed. Also, 99% of our pictures are original as well.

Daimler’s press information is very accurate (as it should be from most large corporations, no matter what their business line).

You can rest assured that the OM 651 has a cast iron block even though I do not have any other supporting material.

As far as the V6 engine blocks and heads go, they are made of aluminum as far back as 2006 as per the following links:

http://www.mercedesclass.net/safety-...s-1997-2006/2/

The Nanoslide technology is truly amazing – from AMG engines now to diesels:

http://www.mercedesclass.net/safety-...ne-technology/

Congratulations to any of you guys considering getting a vehicle with this engine and kudos to MB USA for bringing them to our shores (finally).

I wish they brought the E 250 4MATIC in wagon version.

Cheers.
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Old Sep 20, 2013 | 10:11 PM
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I don't "think" the OM651 has nano-slide - which is a "plasma" iron coating on the cylinder walls of a "aluminum black" - I believe the OM651 has cast iron/treated cylinder inserts in a cast iron black... certainly a very "peppy" engine !
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Old Sep 21, 2013 | 06:50 AM
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No Nanoslide on OM 651. I just pointed out to that page to emphasize the fact that Mercedes V6 diesels have had aluminum blocks for some time now.

Quoting from the above mentioned page on the OM 651:

"The cast-iron cylinder barrels have been more finely honed than in the predecessor model and as such help to improve consumption."
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Old Sep 22, 2013 | 07:57 PM
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OK, found this extensive and detailed page on Wikipedia Germany where it confirms engine block is cast iron with light alloy (aluminum) head:

http://de.wikipedia.org/wiki/Mercedes-Benz_OM_651

You may need to use the translator. Look at the paragraph “Grundmotor.”

Cheers
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