W115 Cylinder Head casting numbers? - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 06-21-2015, 09:19 PM Thread Starter
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W115 Cylinder Head casting numbers?

Hi, I was looking at my cyl head and noticed the number on it. It says
121 016 31 01. Which made me wonder why it starts with 121 since the engine is an M115??

Read somewhere that this was the casting number and that the number below (that's a 9.0) is the compression ratio.

Does anyone know the casting numbers of the W115 cylinder heads? This for gasoline engines of course.
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post #2 of 8 (permalink) Old 06-22-2015, 05:56 PM
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Yes, the "9.0" is a CR designation.

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post #3 of 8 (permalink) Old 06-22-2015, 06:00 PM
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Question

What is full engine number?

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post #4 of 8 (permalink) Old 06-22-2015, 06:05 PM
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Based on that number it looks like a 2 liter M121 engine.

https://en.wikipedia.org/wiki/Mercedes-Benz_M121_engine
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post #5 of 8 (permalink) Old 06-23-2015, 09:27 AM Thread Starter
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Quote:
Originally Posted by Dr. Sternschnuppe View Post
What is full engine number?
M115.923

Quote:
Originally Posted by GreenT View Post
Based on that number it looks like a 2 liter M121 engine.

https://en.wikipedia.org/wiki/Mercedes-Benz_M121_engine
Just saw a post on peachparts forum that touch this subject. The guy there had an M115 engine with the same number on the cylinder head that is on mine. And it is definitely a 115 cylinder head, it just seems it is one of the first ones.

108 series 280S engine replacing options - Page 3 - PeachParts Mercedes ShopForum
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post #6 of 8 (permalink) Old 06-23-2015, 09:53 AM
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Interesting. I'm sure the good Doc will get back with the right info. He's an encyclopedia.
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post #7 of 8 (permalink) Old 06-23-2015, 08:33 PM
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The early versions of the M115 (115.923/926, etc.) came with "121" cyl. head.

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post #8 of 8 (permalink) Old 06-24-2015, 07:56 AM Thread Starter
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Danke schön Herr Doktor

So my cylinder head is the right one for the engine, that's a relieve. I won't have to search for another one if it's in good shape
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