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I have only just noted Bryan Ball's comments (Dear Sir, September 30) on diesel half-tracks, bulldozers, etc. The diesel engines mentioned which started on petrol and then switched to diesel were made by International Harvester themselves, and included a sixcylinder version.
Before being used on the TD14 and TD18 crawler tractors, these engines were also used in wheeled units and were first introduced in the Thirties on the TD35, TD40 and WD40.
They could have been used on half-tracks, although my recollections only associate International petrol truck type engines with those military vehicles but I may be wrong.
The design of engine was quite unique. There were three valves in the head for each cylinder. If your readers are interested I am sure we can find references to, and illustrations of, this example of diesel engineering.
H. E. NORRIS, International Harvester