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Group 20 Technical data
General
Engine designation ............................................................ D2-55 A/B/C D2-75 A
No. of cylinders ................................................................. 4 4
Induction system .............................................................. Atmospheric pressure Turbocharger with
charge air cooler
Bore .............................................................................. 84 mm 84 mm
Stroke ........................................................................... 100 mm 100 mm
Cylinder volume, total ................................................... 2.2 liter 2.2 liter
Power output, see sales literature
Idling speed .................................................................. 850 ± 25 rpm 850 ± 25 rpm
High idle ........................................................................ 3185 ±15 rpm 3240 ±15 rpm
Compression ratio ......................................................... 23,3:1 23,3:1
Compression pressure at starter motor speed ............... >27 Bar >27 Bar
Firing sequence (cyl. no. 4 closest to flywheel) .............. 1-3-4-2 1-3-4-2
Direction of rotation (seen from front) ............................ Clockwise Clockwise
Max. permissible rearwards inclination in operation ....... 20
o
20
o
Max. side inclination in operation................................... 30
o
30
o
Valve clearance, stationary cold engine, inlet and exhaust ... 0.20 mm 0.20 mm
Weight, engine less oil and water .................................. 225 kg 250.6 kg
Max. permitted back-pressure in exhaust system ......... 20 kPa 20 kPa
Pistons
Material ......................................................................... Aluminum alloy Aluminum alloy
Height, total .................................................................. 87.66-87.74 mm 87.66-87.74 mm
Height from gudgeon pin center to piston crown ............ 47.66-47.74 mm 47.66-47.74 mm
Piston clearance ........................................................... 0.038-0.072 mm 0.038-0.072 mm
Front marking ................................................................ “SHIBAURA”-mark inside piston shall when mounted
face the fuel pump (D2-55 A/B/C & D2-75).
Piston rings
Compression rings:
Quantity ........................................................................ 2 2
Upper compression ring, height ..................................... 1.97-1.99 mm 1.97-1.99 mm
2nd compression ring, height ........................................ 1.47-1.49 mm 1.47-1.49 mm
Oil ring:
Quantity ........................................................................ 1 1
Height ........................................................................... 3.90-3.98 mm 3.90-3.98 mm
Piston ring gap in cylinder:
Upper compression ring ................................................ 0.20-0.35 mm 0.20-0.35 mm
2nd compression ring .................................................... 0.20-0.40 mm 0.20-0.40 mm
Piston ring clearance in groove,
upper compression ring ................................................. 0.07-0.11 mm 0.07-0.11 mm
2nd compression ring .................................................... 0.04-0.08 mm 0.04-0.08 mm
oil ring ........................................................................... 0.02-0.06 mm 0.02-0.06 mm
Gudgeon pins
Clearance, piston pin – connecting rod bush ................. 0.010-0.027 mm 0.010-0.027 mm
gudgeon pin – gudgeon pin hole .................................... -0.001- +0.011 mm -0.001- +0.011 mm
Gudgeon pin diameter ................................................... 27.996-28.000 mm 27.996-28.000 mm
Conrod bush int. diameter ............................................. 28.010-28.021 mm 28.010-28.021 mm
Gudgeon pin hole diameter in piston ............................. 27.999-28.005 mm 27.999-28.005 mm
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