Foreword
This manual is a manual for the maintenance and repair of vehicles «Mercedes» series «W 123» (factory designation of the series - body model): models «200», «230», «230E», «250», «280», «280E» with a sedan body; models «200T», «230T», «230TE», «250T», «280TE» with a station wagon body; models «230C», «230CE», «280C», «280CE» with a coupe. On series vehicles «W 123» four- and six-cylinder gasoline engines of the models M 102, M 110, M 115 and M 123 were installed.
Engines of models M 102, M 115, M 123 have one overhead camshaft (SOHC), and the engine model M 110 has two overhead camshafts (DOHC). Many components and elements of engines are largely unified.
The manual is intended for employees of centers, service stations and repair shops, as well as for technically trained motorists. For all the seeming complexity, the design of the car is quite simple, therefore, in some cases, the arrangement of systems, mechanisms and assemblies is described without excessive detail, and the order of maintenance and repair easily becomes clear when reading the text and studying the drawings and does not present special problems for the motorist.
Rules for using the Guide
The guide is divided into chapters. Each chapter is divided into sections. Sections, in turn, are divided into subsections and, where required, into sub-subsections and consist of paragraphs.
The text brought to your attention is accompanied by explanatory illustrations.
The description of the procedures once mentioned in the text is usually not repeated a second time. Instead, if necessary, reference is made to the relevant section (subsection, etc.), where this procedure has already been encountered.
References to the position of an assembly or component on the left or right of the vehicle are based on the assumption that the reader is in the driver's seat, facing forward.
The descriptions in this manual are presented in a simple and understandable way. If you strictly follow the recommendations given in the text and in the accompanying illustrations, there should not be any particular difficulties in performing the assigned tasks.
Due attention should be paid to compliance with the technical parameters and requirements for tightening torques of threaded connections, summarized in sections «Design and technical parameters» and placed at the beginning of each Chapter. These specifications should guide all work. Within the individual sections, the necessary dimensions and values for adjustment are not always given.
Simple operations such as «open the hood» or «loosen wheel nuts» taken for granted and also not always mentioned.
On the contrary, the text describes in detail the most complex and requiring increased accuracy when performing the procedure.