Shown above is the September 1935 Instruction Book for these One-ton and 30-cwt trucks.
The One-ton and 30-cwt (1-1/2 Ton) trucks were built in Great Britain in the 1930's and are a variation of the US Model AA and BB trucks.
These trucks were built with both three speed and four speed transmissions.
The One-ton used a 3/4 floating rear truck axle, and the 30-cwt used a full floating rear axle.
The basic cab and sheet metal was based on the Model A, but the engine was a Model B mated to a Model A flywheel housing.
Additionally, these trucks were all right hand drive models.
The fuel system Figure above is the most interesting and revealing view.
Note the Model B engine block, valve cover, and carburetor.
The Model B carburetor shows the late 1931 Model A sidebowl fuel filter mounted to the front of it, and also a special fuel pipe from the indented firewall fuel valve to the carburetor.
Also note the Model A flywheel housing, intake and exhaust manifolds, and distributor, as well as Model A fuel tank and system details.
This view also shows the special unique oil pan and flywheel housing shield used to mate the Model B block to the Model A flywheel housing, as well as the fuel pump block-off cover.
Note the Model B engine block, counterweighted Model B crankshaft, the Model B cylinder head and waterpump, as well as the Model A flywheel housing and special oil pan.
This picture above also shows a Model B distributor, but all other views show a Model A distributor.
Of interest in the cooling diagram above is the special radiator used to mate the Model B waterpump outlet to the top inlet of the radiator for use with Model A radiator shell and hood.
The Model A and B water outlets on the water pump and goose neck are at different design angles.
The special radiator is basically a Model A radiator with a special top tank to fit both the Model A radiator shell and the Model B inlet connection position.
Also seen is the unique engine oil pan to mate the Model B engine to the Model A flywheel housing.
It is likely that the engine oil pan is just a typical Model B without the spot welded steel lower flywheel housing extension, thereby allowing clearance for use with the Model A flywheel housing.
Shown above is the three-speed transmission used with the larger Model AA and BB style 3/4 floating rear axles.
The important details to note are that it is basically a Model A transmission, clutch housing, and flywheel housing, coupled to the Model B flywheel and Model B crankshaft at the front.
At the rear of the Model A transmission there is a special drive gear coupling mounted to the rear of the Model A mainshaft. It is similar to the Model AA drive gear coupling used on the US Model AA four-speed transmissions, but sized for the smaller Model A main shaft spline on the three-speed transmission.
Also, since the three-speed Model A transmission is mated to the Model AA and BB style 3/4 floating rear axles, the transmission rear main bearing retainer may be unique, or it may be the same arrangement as used on 1928-29 Model AA chassis with three-speed.
Shown above is the One-ton rear axle, which is a 3/4 floating design, similar to the 1929-31 US Model AA and 1932 US Model BB.
Shown above is the 30-cwt (1-1/2 Ton) rear axle, which is a full floating design, similar to that of the 1933-34 US Model BB.
The electrical system diagram above shows the basic Model A style arrangement including a Model A distributor and popout ignition switch.
Note the fender mounted "Wing" lamps in the circuit diagram above.