Kubota D905

Kubota D905The Kubota D905 is a 0.9 L (898 cc, 54.8 cu-in) straight-three, water-cooled naturally aspirated diesel engine from Kubota 05-series.

The Kubota D905 engine has a spherical type сombustion сhamber with glow plug, Bosch MD type mini fuel injection pump, and mini injection nozzle. The compression ratio rating is 22.0:1 for the early version (D905-B(E)) or 23.0:1 for the later versions (EPA Tier 2, 3, 4). The cylinder bore and the piston stroke are 72.0 mm (2.83 in) and 73.6 mm (2.90 in), respectively. The D905 diesel engine produced up to 23.8 PS (17.5 kW; 23.5 HP) at 3,600 rpm of net horsepower and 52.8 N·m (5.4 kg·m, 38.9 ft·lb) at 2,400 rpm of torque.

The breakdown of the engine code is as follows:

  • D – 3-cylinders
  • 9 – Approximate displacement 900 cc
  • 05 – 05-series

General information

Engine Specifications
Engine code D905
Layout Straight-3, vertical diesel engine
Fuel type Diesel
Production –
Displacement 0.9 L, 898 cm3 (54.8 cu in)
Fuel injection pump Bosch MD type mini fuel injection pump
Fuel nozzle Mini nozzle
Starting system Electric starting with 12V starter
Starting support device Glow plug in combustion chamber
Governor All speed mechanical governor
Power adder None
Max. Horsepower 23.8 PS (17.5 kW; 23.5 HP) at 3,600 rpm*
Torque output 52.8 N·m (5.4 kg·m, 38.9 ft·lb) at 2,400 rpm*
Firing order 1-2-3
Dimensions (L x W x H): 498 x 397 x 609 mm (19.6 x 15.6 x 24 in)
Weight 95 kg (210 lbs)

*-may be differ depending on engine modification

Cylinder block

Cylinder block
Compression ratio: 22.0:1 or 23.0:1
Cylinder bore: 72.0 mm (2.83 in)
Piston stroke: 73.6 mm (2.9 in)
Number of piston rings (compression / oil): 2 / 1
Cylinder inner diameter: 72.000-76.019 mm (2.8346-2.9929 in)
Piston skirt diameter –
Piston ring side clearance: Second 0.085-0.112 mm (0.0033-0.0044 in)
Oil 0.020-0.055 mm (0.0008-0.0022 in)
Piston ring end gap: Top 0.250-0.400 mm (0.0098-0.0157 in)
Second 0.250-0.400 mm (0.0098-0.0157 in)
Oil 0.250-0.400 mm (0.0098-0.0157 in)
Piston pin outer diameter 22.002-22.011 mm (0.8662-0.8666 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 diameter: 39.959-39.975 mm (1.5732-1.5738 in)

Cylinder head

Cylinder head
Valve Arrangement: OHV, gear drive
Valves: 6 (2 valves per cylinder)
Valve head diameter: INTAKE –
EXHAUST –
Valve length: INTAKE 101.5 mm (3.99 in)
EXHAUST 101.5 mm (3.99 in)
Valve stem diameter: INTAKE 6.960-6.975 mm (0.274-0.2746 in)
EXHAUST 6.960-6.975 mm (0.274-0.2746 in)
Valve spring free length: INTAKE 37.0-37.5 mm (1.4567-1.4764 in)
EXHAUST 37.0-37.5 mm (1.4567-1.4764 in)
Camshaft lobe height: INTAKE 28.80 mm (1.1339 in)
EXHAUST 29.00 mm (1.1417 in)
Camshaft journal diameter: 35.934-35.950 mm (1.4147-1.4154 in)

Maintenance data

Valve clearance
Intake valve 0.145-0.185 mm (0.0057-0.0073 in)
Exhaust valve 0.145-0.185 mm (0.0057-0.0073 in)
Compression pressure
Standard D905-B(E): 2.84 to 3.23 MPa, 29.0 to 33.0 kgf/cm2, 412 to 469 psi
Other: 3.73 to 4.11 MPa, 38.0 to 42.0 kgf/cm2, 541 to 597 psi
Oil system
Recommended engine oil CF or higher
SAE Viscosity Number SAE 10W-30, 10W-40
Engine 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.)
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)
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
Cooling system
Coolant capacity 3.4 L (3.6 US.qts, 3.0 Imp. qts)
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.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

4 Comments

  1. I purchased a Coleman Rite-Lite light plant with a Kubota D 905 -Serial # YG6707. How much H.P. does this motor put out

    Reply

    • Did you ever find one? I have one that runs perfect. The generator is no good but the motor is great.

      Reply

  3. Like Lars Oster above, I acquired a very good Coleman Rite-Lite light plant with a Kubota D 905-E to use as a backup generator down here in Hurricane alley in Texas.
    A super thank you to Sergei Wers for all the very detailed data he has supplied here, it will be most useful in maintaining this machine.

    Reply

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