Kubota D905

Kubota D905The Kubota D905 is a 0.9 L (898 cc, 54.8 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion small diesel engine, manufactured by Kubota for general-purpose applications.

A 72.0 mm (2.83 in) cylinder bore and 73.6 mm (2.9 in) piston stroke give the D905 engine a total of 898 cc of displacement. The compression ratio rating is 22.0:1 for model D905-B(E) or 23.0:1 for models D905-E2B,-E3B,-E4B.

The Kubota D905 diesel engine produced 23.8 PS (17.5 kW; 23.5 HP) at 3,600 rpm of maximum net output power and 52.8 N·m (5.4 kg·m, 38.9 ft·lb) at 2,400 rpm of peak torque.

The Kubota D905 features:

  • SOHC design
  • Spherical type (E-TVCS) combustion chamber
  • Bosch MD type mini fuel injection pump
  • All speed mechanical governor
  • Forced lubrication by trochoid pump lubrication system
  • Liquid-cooled cooling system
  • Electric starting with 12V starter

General information

Engine Specifications
Engine model D905
Engine type 4-stroke, SOHC, three-cylinders
Displacement 0.9 L, 898 cm3, (54.8 cu·in)
Max. horsepower 23.8 PS (17.5 kW; 23.5 HP) at 3,600 rpm
Max. torque 52.8 N·m (5.4 kg·m, 38.9 ft·lb) at 2,400 rpm
Cooling system Liquid-cooled
Lubricating system Forced lubrication by trochoid pump
Fuel injection pump Bosch MD type mini fuel injection pump
Fuel nozzle Mini nozzle
Fuel used Diesel fuel No. 2-D
Firing order 1-2-3
Starting system Electric starting with 12V starter
Starting support device Glow plug in combustion chamber
Governor All speed mechanical governor
Charging system Alternator 12V,
PTO shaft rotation Counterclockwise
Dimensions (L x W X H) 498 x 397 x 609 mm (19.6 x 15.6 x 24 in)
Dry weight 95 kg (210 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: D905-B(E): 22.0:1
D905-E2B, D905-E3B, D905-E4B: 24.0:1
Cylinder bore: 72.0 mm (2.83 in)
Piston stroke: 73.6 mm (2.9 in)
Cylinder internal diameter (standard): 72.000-72.019 mm (2.8346-2.8354 in)
Number of piston rings (compression / oil): 2/1
Connecting rod small end diameter (standard): 22.025-22.040 mm (0.8671-0.8677 in)
Piston pin diameter: 22.002-22.011 mm (0.8662-0.8666 in)
Side clearance (Second): 0.085-0.112 mm (0.0033-0.0044 in)
Side clearance (Oil): 0.020-0.055 mm (0.0008-0.0022 in)
Ring end gap (Top): 0.250-0.400 mm (0.0098-0.0157 in)
Ring end gap (Second): 0.250-0.400 mm (0.0098-0.0157 in)
Ring end gap (Oil): 0.250-0.400 mm (0.0098-0.0157 in)
Crankshaft main journal diameter: 1-2: 47.934-47.950 mm (1.8872-1.8878 in)
3: 51.921-51.940 mm (2.0442-2.0448 in)
Crankpin journal diameter: 39.959-39.975 mm (1.5732-1.5738 in)
Crankshaft center distance: 36.8 mm (1.45 in)
Cylinder head
Valve arrangement: SOHC, gear drive
Valves: 2 (6 valves in total)
Valve head diameter (INTAKE): 33.0 mm (1.3 in)
Valve head diameter (EXHAUST): 27.0 mm (1.06 in)
Valve steam diameter (INTAKE): 6.960-6.975 mm (0.274-0.2746 in)
Valve steam diameter (EXHAUST): 6.960-6.975 mm (0.274-0.2746 in)
Valve length (INTAKE): 101.5 mm (3.99 in)
Valve length (EXHAUST): 101.5 mm (3.99 in)
Valve spring free length (INTAKE): 37.0-37.5 mm (1.4567-1.4764 in)
Valve spring free length (EXHAUST): 37.0-37.5 mm (1.4567-1.4764 in)
Camshaft lobe height (INTAKE): 28.80 mm (1.1339 in)
Camshaft lobe height (EXHAUST): 29.00 mm (1.1417 in)
Camshaft journal diameter : 35.934-35.950 mm (1.4147-1.4154 in)
Timing Gear
Crank Gear to Idle Gear 1 (backlash): 0.0320-0.115 mm (0.00126-0.00452 in)
Idle Gear 1 to Cam Gear (backlash): 0.0360-0.114 mm (0.00142-0.00448 in)
Idle Gear 1 to Injection Pump Gear (backlash): 0.0340-0.116 mm (0.00134-0.00456 in)
Idle Gear 1 to Idle Gear 2 (backlash): 0.0330-0.117 mm (0.00130-0.00460 in)
Idle Gear 2 to Governor Gear (backlash): 0.0300-0.117 mm (0.00119-0.00460 in)

Tightening torque

Tightening torque specs
Cylinder head cover screw (M7x1.0): 6.9-8.8 Nm (5.1-6.5 lb-ft)
Cylinder head screw (M10x1.25): 63.7-68.6 Nm (47.0-50.6 lb-ft)
Main bearing case screw 1 (M8x1.25): 29.4-34.3 Nm (21.7-25.3 lb-ft)
Main bearing case screw 2 (M9x1.25): 49.0-53.9 Nm (36.2-39.8 lb-ft)
Flywheel screw (M10x1.25): 53.9-58.8 Nm (39.8-43.4 lb-ft)
Connecting rod screw (M8x1.0): 41.2-46.1 Nm (30.4-34.0 lb-ft)
Rocker arm bracket nuts (M7x1.0): 21.6-26.5 Nm (15.9-19.5 lb-ft)

Service Data

Engine
Idle speed: 900 rpm
Maximum speed: 3,000-3,800 rpm (depending on modification)
Cylinder compression: D905-B(E): 2.84 to 3.23 MPa, 29.0 to 33.0 kgf/cm2, 412 to 469 psi
D905-E2B,-E3B,-E4B: 3.73 to 4.11 MPa, 38.0 to 42.0 kgf/cm2, 541 to 597 psi
Valve clearance
Intake valve clearance: 0.145-0.185 mm (0.0057-0.0073 in)
Exhaust valve clearance: 0.145-0.185 mm (0.0057-0.0073 in)
Oil system
Lubrication system: Forced lubrication by trochoid pump
Oil type: CF or higher
Recommended oil: SAE 10W-30, 10W-40
Oil capacity: 101 mm: 4.0 L (4.23 US. qt, 3.52 Imp. qt.)
125 mm: 5.1 L (5.40 US. qt, 4.50 Imp. qt.)
Oil pressure: At idle speed: 49 MPa (0.5 kgf/cm2, 7 psi)
At rated speed: 196 to 441 MPa (2.0-4.5 kgf/cm2, 28 to 64 psi)
Oil filter: Full flow paper filter (Cartridge type)
Oil pressure indicating: Electrical type switch
Oil and oil filter change interval: Every 200 hours
Fuel system
Fuel injection pump: Bosch MD type mini fuel injection pump
Injection nozzle: Mini Nozzle (DNOPD)
Firing order: 1-2-3
Injection pressure: 13.73 MPa (140 kgf/cm2, 1,991 psi)

Applications

Manufacturer or Brand Models
Tractors
Kubota A-15, A-155, B72, B1700, B1710, B1830, BX22, BX23, BX2200

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