<font color="green"> The 3120 with the (same as 2520) 3TNV82A eng. number is listed with 91.5 cu. in. So does this look like the new 2520 will really have a 91.5 cu. in. engine? </font>
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The model number listed online for the 3120 HAS to be wrong. There is NO WAY that the 3TNV82A would go in that weight size (the old 3TNE82A had more power and was inadequate in the smaller 4210...)
All of the specs match the 3TNV84, which is what the manual lists:
Engine
Manufacturer Yanmar
Model Number (3120) 3TNV84
Model Number (3320) 3TNV88
Model Number (3520) 3TNV84T
Model Number (3720) 3TNV84HT
Type Diesel
Gross Horsepower (3120) 22 kW (29.5 hp)
Gross Horsepower (3320) 24.2 kW (32.4 hp)
Gross Horsepower (3520) 27.7 kW (37.2 hp)
Gross Horsepower (3720) 32.6 kW (43.7 hp)
Manufacturer's Estimated PTO Horsepower (3120 eHydro) 16.4 kW (22 hp)
Manufacturer's Estimated PTO Horsepower (3320 PRT) 19.0 kW (25.5 hp)
Manufacturer's Estimated PTO Horsepower (3320 eHydro) 18.6 kW (25 hp)
Manufacturer's Estimated PTO Horsepower (3520 PRT) 22.7 kW (30.5 hp)
Manufacturer's Estimated PTO Horsepower (3520 eHydro) 22.4 kW (30 hp)
Manufacturer's Estimated PTO Horsepower (3720 eHydro) 26.1 kW (35 hp)
Rated Engine Speed 2600 rpm
Operating Range 1000 - 2810 rpm
Engine Torque @ Rated Speed (3120) 75.4 N·m (55.6 lb-ft)
Maximum Torque @ 1560 rpm (3120) 90.4 N·m (66.7 lb-ft)
Engine Torque @ Rated Speed (3320) 83.5 N·m (61.6 lb-ft)
Maximum Torque @ 1560 rpm (3320) 100.2 N·m (73.9 lb-ft)
Engine Torque @ Rated Speed (3520) 96.4 N·m (71.1 lb-ft)
Maximum Torque @ 1560 rpm (3520) 115.8 N·m (85.4 lb-ft)
Engine Torque @ Rated Speed (3720) 114.3 N·m (84.3 lb-ft)
Maximum Torque @ 1560 rpm (3720) 137.1 N·m (101.1 lb-ft)
Displacement (3120, 3520, and 3720) 1.5 L (91.5 cu in.)
Displacement (3320) 1.64 L (100.1 cu in.)
Cylinders 3
Bore and Stroke (3120, 3520, and 3720) 84 x 90 mm (3.3 x 3.54 in.)
Bore and Stroke (3320) 88 x 90 mm (3.46 x 3.54 in.)
Compression Ratio 18.5:1