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:

  • 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 modelD905
Engine type4-stroke, vertical, three-cylinders
Displacement0.9 L, 898 cm3, (54.8 cu·in)
Max. horsepower23.8 PS (17.5 kW; 23.5 HP) at 3,600 rpm
Max. torque52.8 N·m (5.4 kg·m, 38.9 ft·lb) at 2,400 rpm
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by trochoid pump
Fuel injection pumpBosch MD type mini fuel injection pump
Fuel nozzleMini nozzle
Fuel usedDiesel fuel No. 2-D
Firing order1-2-3
Starting systemElectric starting with 12V starter
Starting support deviceGlow plug in combustion chamber
GovernorAll speed mechanical governor
Charging systemAlternator 12V
PTO shaft rotationCounterclockwise
Dimensions (L x W X H)498 x 397 x 609 mm (19.6 x 15.6 x 24 in)
Dry weight95 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 capacity3.4 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 BrandModels
Tractors
KubotaA-15, A-155, B72, B1700, B1710, B1830, BX22, BX23, BX2200
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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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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