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Had a built in pneumatic governor, serial numbers for a 4DM started at DE 1001 The injection pump was a "SiMMS" inline SPE4A/755 and The crankshaft is driven by a triplex roller chain, it was a 3.7" bore andĤ.724" compression, ratio is 16.5:1 and normal operating speed range ofġ,000rpm to 2,000 rpm. With wet cylinder liners and aluminum pistons. The 4DM went on sale at £597.00, for the basic model only (no price increaseįirst shown at the Royal Highland show in June 1954, the OEA 2 engine, has aĥ main bearing crank shaft and was of a direct injection type it was fitted Tractor, using a B.M.C 4 cylinder Diesel engine type OEA 2 which developed 45 In March 1954, Morris-Motors introduced the new "Nuffield-Universal" 4DN Single front wheel to a "V" twin wheel arrangement. The three-wheeled version of the Nuffield-Universal tractor was changed from In 1953, the original draw bar was replaced by a mid mounted draw bar forīetter weight distribution, this also allowed room for an overload release and Redesigned combustion chamber, improved spark plugs and positioning, plug sizeĬooling of the engine considerably improved Some of the improvements are listed below: Which resulted in a 10 per cent more power (43bhp as against 38 bhp on theĮarlier engine) and 10 per cent more fuel economy. The new TVO engine had a number of improvements In February 1953 production of the ETC T.V.O engine started, ready for the