Here are some of the surviving factory drawings of
relevant engines – as found in a street in Wolverhampton many years ago ….
Click on the coloured link to download a pdf file
Above: JTOR/KTOR Gear Cover from 1924
Above: JTOR/KTOR Driveside crankcase from 1924
Above: JTOR/KTOR Timingside crankcase from 1924
Above: JTOS 8/80 Timingside crankcase from 1936
Above: JTOS 8/80 Driveside crankcase from 1936. Timing cover to follow.