![]() hence an engine bearing the following number-281 DH5 was manufactured in 1955. So for example DH2 was manufactured in 1952,DH3 in 1953, DH4 in 1954, DH10 in 1960 etc. this system continued until DECEMBER 1951 by which time engine numbers had reached 1/77820.Īt this juncture a further change was introduced because from 1952 onwards every engine number began with 1 at the start of each year and to avoid any confusion the SPEC.number was arranged to give the year of manufacture of each engine. īecause at that time engine numbers had reached 199999 and the decision was made to introduce a shorter numbering scheme starting with 1/1000. If your engine number begins with 1/ or has a number with less than five figures, it was built after.
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