The 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:
- 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, vertical, 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 | |
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) |
Cooling system | |
Coolant capacity | 3.4 L (3.6 US.qts, 3.0 Imp. qts) |
Electrical system | |
Battery: | 12V, 60Ah or equivalent |
Starting motor: | 12 V, 0.9 kW |
Starter mica undercut: | 0.5-0.8 mm (0.0197-0.0315 in) |
Starter brush length: | 13.0 mm (0.5118 in) |
Charging alternator: | 12 V, 150 W |
Alternator (no-load voltage): | AC 13,5V at 5,000 rpm |
Applications
Manufacturer or Brand | Models |
Tractors | |
Kubota | A-15, A-155, B72, B1700, B1710, B1830, BX22, BX23, BX2200 |
We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.
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