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91
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by Scott Montoney on February 16, 2019, 05:16:48 PM »
The combustion Chamber in the head is of different sizes/shapes.  The Smaller chamber is what makes the higher ratio.
The gasket mates to the head, not the Block.
I have a photo of both sizes sitting on top of each other.  It shows the different shape.
The shop manual mentions this in several places to make sure the gasket is correct.
If you look at the gasket side of the head, your gasket should match the outline of the head chambers.
92
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by yan2947 on February 16, 2019, 05:06:19 PM »
Why would be head gasket be different if they have to mate up with the same block?
93
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by Scott Montoney on February 16, 2019, 10:02:24 AM »
From what I recall, original heads were cast iron with a compression ratio of 6.5:1.
At some point in time, they were replaced with aluminium at a compression of 6.8:1.
Latter, there was a "high compression" head that came out for the CabA and 220a, with a ratio of 7.6:1.  This head also had a different cam shaft.
(I believe there is even a 8.7:1 for the 220S)
So, make sure you check what compression head you have so that you get the correct head gaskett.
Here is a photo of the stamp om my head and the stamp on the end of the cam shaft.
The service manual has several different referances to these differences.

94
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by yan2947 on February 16, 2019, 08:58:39 AM »
Scott and Ted,

thank you.  It looks like quite a bit is available but I am sure some stuff will be harder to find.

Scott, I have the aluminum head but it appears to be original and an option in 52.  Is that correct?

Yan
95
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by Scott Montoney on February 15, 2019, 01:02:50 PM »
This is the part that is so frustrating!!  You never know what is available from MB Classic.  One month they may have what you need, but then it is suddenly not available.  And I rarely get any idea if it will ever be available again.  I bought my head gasket from them fall of 2017.  I guess they are out, but does that mean they will never have them again?  Who knows.
 I was able to order all the sprockets for my engine.  Maybe I was lucky.  Be sure to check Niemouller.
Also, if you do order a cam shaft, make sure you get what you need.  Same goes for the head gasket!!  In my case, my head is a higher compression that what is shown in parts manual and it takes a different head gasket and cam shaft.

So don't strictly trust the part number you see in the parts book, especially if the head is Not the original cast iron, and is the newer lightweight metal (aluminum).

97
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by yan2947 on February 15, 2019, 12:02:27 PM »
Got this back from the classic center:
Hi Yan

Here is what we can still order from Germany.

Rod bearings 1st repair 47.75mm $262.00

Camshaft- $370.00

Timing Chain- $264.00

Left engine cover gasket- $22.50

 

Below are parts that are no longer supplied

Pistons

Main bearings

Oil pump

Sprockets

Gasket set

Head gasket

Right engine cover gasket

 

98
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by yan2947 on February 15, 2019, 07:27:42 AM »
Any advice:

I am looking to see what is available for my 1952 220 Sedan for an engine rebuild.  The motor is:
 M180/180.920 with motor number: 08766/52
The local machine shop is looking for the following:
Pistons & rings            1st oversize      80.50 mm

Main bearings              1st undersize    59.71 mm

Rod bearings               1st undersize    47.71 mm

I would replace the camshaft and oil pump as a routine engine rebuild.  If available, new timing sprockets and timing chain.  Obviously a complete gasket set as well. 

I have not disassembled the cylinder head yet.  The book shows valve guides with various oversize options.  I will up date this list and mail it again after I inspect the head.   
99
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by Henry Magno on January 27, 2019, 02:07:39 PM »
I send out the zinc plating. We do use a tool blackening product in the shop, in a pinch. It's not as durable as the black zinc phosphate that gets done by the industrial plater. Some of the parts that are brownish gray, like brackets and other MB specific parts were done in an iron phosphate process, sometimes known as "Bonderizing". Some people assume that this is untreated metal because of the color. My plater does not do this and maybe I will eventually find someone who does. The black zinc phosphate is not jet black unless it is oiled, so it suffices. For a really high quality finish on black, they do a zinc with black, or black over zinc, but this is more expensive because they have to wire hang all the parts. Supposedly it is also less scratch resistant. My plater will either oil the job or not. I'm not sure what that product is. Usually standard hardware I have oiled, but I rinse most of it off.

Here is my supplier for the blackening chemicals:

( SKU: PRE-45118 , Description: Metal Polish/Cleanser, 1 pint , Quantity: 2 )
( SKU: PRE-45109 , Description: Tool Black - one quart , Quantity: 1 )
Order Total: $106.34

Victor Machinery Exchange, Inc.
56 Bogart Street
Brooklyn, NY 11206-3817
Phone: 800.723.5359
International: 718.366.9293
Fax: 718.366.7026
Email: sales@victornet.com
100
220 / Re: 1952 220 Sedan W187 build restoration
« Last post by yan2947 on January 27, 2019, 10:00:03 AM »
The flap appears to be flat. That's the one I have at my house and I assume both are the same way. Not sure if you can look at what you have Henry and see if I am correct. Here are two photos of that one flap.
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