BEA inspection of the D 314-02 clutch release cylinder — groove volume (test 42.80G)

In this document

This plan is a Test Office (BEA) inspection concerning the D 314-02 clutch release cylinder, carried out at ≈100 magnification and dated "Controle BEA / Le 3-10-56" p. 8.

It specifically concerns the "Volume of the groove" of the part, with the mention "VALABLE POUR ESSAI 42.80G" indicated in the title block p. 8.

The inspection diagram

The cross-sectional sketch shows the profile of the machined groove with the following dimensions p. 8:

An arrow "Vers le fond" (Towards the bottom) indicates the orientation of the measurement. An annotation, partially uncertain, mentions a "damaged edge on car", specifying that the measurement was taken "at the least damaged spot" p. 8.

The title block

The title block identifies the plan under the reference E806-2210, mentions "Plan à rendre à Vedie" (Plan to be returned to Vedie) on the date of 3-10-56, and refers to the "DÉSIGNATION EMPREINTE DE LA GORGE" (Groove impression designation) as well as a modification "DU CIRCLIPS DE ELV 545 (Circlips carré)" (OF THE ELV 545 CIRCLIP (Square circlip)) p. 8. The material, treatment, coating, and weight boxes are blank.

Context

The D 314-02 clutch release cylinder is part of, according to the related archives in the same file, a series of parts monitored at Citroën between 1954 and 1957, a period of development for the DS 19, whose clutch control benefited from hydraulic assistance linked to the hydropneumatic system developed by Paul Magès.

The name "Vedie", mentioned in the title block as the recipient of the plan, also appears on other hydraulic parts in this collection, suggesting a draftsman or a technical department recurring in this type of inspection — but this link remains external to the strict content of this page.

Archivist's perspective

This document is a routine technical inspection, but it bears the concrete trace of actual use: the measured part comes from a car, and not from a workshop prototype, which attests to a downstream inspection on a driven part p. 8.

The extreme precision of the dimensions (to the hundredth of a millimeter) illustrates the dimensional requirements imposed on a hydraulic component of this type, consistent with the rigor necessary for the sealing of Citroën circuits of the time.

This inspection plan dated 3 October 1956 is likely situated between the earlier and later versions of the D 314-02 cylinder kept in this collection, such as the 1954 plan and the January 1957 plan with leak test, suggesting continuous monitoring of the quality of this part over several years.