Ponton chassis numbers

Importance of knowing the vehicle's numbers:

Many times, when ordering replacement parts for your Mercedes-Benz Ponton, the engine and/or chassis number is needed to determine the exact part required.  This was also true when the Pontons were brand new because, as improvements were made during a production run, the new/improved parts were installed on the next vehicle on the assembly line.  The factory did not wait until the end of the "model year" to make such changes.  Fortunately, accurate records were kept detailing which chassis and engine numbers received which parts.  All factory authorized Mercedes-Benz agents and many specialized after-market vendors have access to this information today. Because the last Ponton was built four decades ago, using your vehicle's engine and chassis numbers when ordering spare parts is more important than ever.  

Here is an example of why it is important to know your engine and chassis numbers.  Let us assume there is a certain 1957 Type W121 190 sedan whose engine is not original to the vehicle.  Not knowing the correct engine number can be the source of considerable confusion when ordering parts.  The chassis number ("plate A") may identify the vehicle as a 1957 W121 190, yet the engine number (with a 121.923 prefix) ("plate D") reveals that the engine originally came from a W120 180a or 180b (the original 190 engine would have carried a 121.920 engine number prefix).  In this case, when ordering engine replacement or tune-up parts, you would need to be sure that you select parts for the correct engine.  If the only thing your parts vendor knows is that you have a "1957 190", they might (quite logically) sell you the engine parts for the original style engine.  So, for example, when you receive a carburetor rebuild kit, nothing seems to fit.  It is an easy oversight to make, and something you should be aware of when ordering replacement parts.

Ponton chassis number prefixes on :

The "W" that sometimes precedes the chassis number prefix denotes the "Werksbezeichnung". This is a factory code which serves to identify any variants of a particular model built upon a specific chassis platform.   For example, a Type W120 could identify any of the following 4 cylinder sedan models: 180/180a/180D/180b/180Db/180c/180Dc.

Ponton engine number prefixes on "plate D":

* The 121.928 engine (Type M 121 B IX) was used on the 190SL from 1961-1962.

** Reference: Mercedes-Benz Service Manual for 180-220 SE.  In the table on page 00-1/7, we find that the 220a has a chassis type 180.01, engine model M 180.II (180.921). The same table recites that the Type 219 sedan has a chassis type of 105.01 and engine model M 180.II (180.921). That is, this manual states that the 219 and 220a have a different chassis but the same engine. See also pictures and text at pages 01-4/4 to 01-4/5, which show both sides of a 180.921 (single carburetor) and 180.924 engine and recite that the 180.921 went into the 220a and 219 and that the 180.924 went into the 220S.

The 1959 model year was transitional because production ceased for certain 6 cylinder models (219 / 220S cabriolet / 220SE sedan) while the life cycle of the "b" version of the 4 cylinder models (180b / 180Db / 190b / 190Db) and certain 6 cylinder models (220SE cabriolet / coupé) was just beginning.

* There are certain chassis numbers from 1959 which seem to use a combination of both the early 13 digit and the later 14 digit numbering systems.  The result is a 15 digit chassis number found on "plate A".  

An example of a 15 digit chassis number:

180.011.10.9504522

This chassis number came from a visitor to these web pages.  This particular chassis number owes most of its structure to the 1953-1959 (13 digit) numbering system.  However, note the seventh and eighth digits (the third group of numbers from the left).  This group is more akin to the 1960-1962 (14 digit) system and can be broken down with the following clarity.  The seventh digit (1) indicates LHD (left hand drive) while the eighth digit (0) indicates standard transmission.

• Vehicle: 1959 Type W180 220S sedan

• Chassis number on "plate A": 180.011.10.9504522

• 180 = (W180) = "werksbezeichnung" (factory code)

• 011 = sliding sunroof

• 10 = (1 = LHD / 0 = standard transmission)

• 95 = 59 (last 2 digits of production year {1959} in reverse order)

• 04522 = serial number /  The 4,522nd W180 off the line in 1959