It has been found by experience that certain Y alloy connecting rods with embossed lettering and Part Number on the shank, fitted to early Gipsy I, II and III engines, have small surface cracks, the origin of which has been traced to the stamping process. These cracks, if discovered in the early stages, can be satisfactorily removed by the method subsequently described, but if allowed to remain they are liable to develop and ultimately result in failure of the rods.
(1933), "Air Ministry Official Notices: Instructions to Aeroplane Owners and Ground Engineers on Essential Modifications", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 9, pp. 215-216. https://doi.org/10.1108/eb029719
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