[Mike Cecil]

Ford Army Parts Information Letter AAP6, issued 20 April 1942. This is stated to be applicable to CMP vehicles assembled in Victoria, Australia, so may differ slightly from that of CMPs assembled in other states:

Under the heading 1941 Models:

"Engine Prefix 2G was a 3-3/16 bore (Lorry), 4 speed gearbox lowest engine number 2G219F first assembled January 1941."

The same AAP6 states that the last '1G' prefix engine, serial 1G15318F, was assembled in November 1941.

So a considerable overlap when 3-3/16 bore engines with '1' and '2' prefixes were being assembled to 4-speed Lorry gearboxes.

Why, then, could there not be a similar overlap between '2' and '3' prefixed engines?

3-3/16 bore engines with a 3-speed gearbox (passenger cars and utilities) had a 'D' code eg 2D6128F, the first '2D' engine-gearbox assembled which was in November 1941, hence the letter indicates an engine-gearbox combination, not just the engine, so it stands to reason that the number was assigned at the time the combination was assembled, not when the engine alone was assembled.

The ID plate for the truck indicates that the '3G' prefixed engines were being assembled with the gearbox and the number for the combination assigned prior to late December 1941 in Canada, which would fit if there was a similar overlap to the 1G-2G engine/gearbox assemblies indicated above.

Mike