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In the process of vehicle design at BMC, the first documented item is a Sketch and many of these have been preserved. These often have an identifying number prefixed YS, indicating Australian Sketch. Then, things proceed to a Drawing. Australian produced drawings have drawing numbers with a Y in the second character position. There is a set procedure for assigning drawing numbers according to the type of part (mechanical, trim, body, etc). Often as not, the Drawing Number for a single item becomes the Part Number. The primary reference source for all parts scheduled for production are the Drawings since these contain the ideas from the sketches and also include actual dimensions, tolerances, materials, and finish (and as will be discussed below, revisions).
From these drawings, (which include individual parts, assemblies and tables) other documentation is prepared to allow vehicles to be manufactured. These manufacturing documents are things like Schedule of Parts (similar to what we would usually call a Bill of Materials), Engineering Release Note, Stop Orders, Drawing Office Instructions, Production Supplies Release, plus planning documents for the action to be taken at each station on the production line.
There is a set procedure for introducing engineering changes which fed back to Drawing Revisions. The picture below was drawn up by one of the engineers to illustrate the flow of documentation. These changes are documented through things like an Engineering Change Note, Engineering Change Summary, Engineering Change Recommendation, and Concession Request. Changes which are to be implemented are documented on the drawings and are dated. Superseded drawings were also kept in case a previous version had to be examined. We can thank Peter Davis for this exceptionally robust system. Peter and I are preparing a new book which gives samples of all the documents and how they were used.
Then, there is a multitude of other documents prepared later that allow the vehicles to be serviced, such as Workshop Manuals, Service Parts Lists with associated Parts Amendment Advice, Technical Bulletins, Product Problem Advice, Service Liaison Summaries, Product Fault Summaries etc.
The Service Parts Lists/Parts Catalogues are not catalogues for what was fitted in production (although they are often used by us now for this purpose). Service Parts Lists were published by the Parts and Accessories Division, not Product Engineering. P&A did, however, have a copy of a subset of the Product Engineering drawings and the P&A drawings are still in existence, and are those from which winabbey sometimes posts. In many cases, P&A arranged manufacture of the part with an outside supplier different to that which supplied production line items. The Service Parts Lists show “replacement parts”.
Although the discussion has gone beyond the OP’s question, I trust that the above widens the reader’s of view beyond the service documentation which although useful, should not be considered the final authority without reference to the drawings. - Tony Cripps
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