Kubota D905 (0.9 L) Diesel Engine: Specs, Review & Service Data

Kubota D905 Engine Specs

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

The Kubota D905 engine has a spherical type сombustion сhamber with a Bosch MD type mini fuel injection pump, glow plug, and mini injection nozzle. 

The Kubota D905 engine 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 Kubota D905 engine cylinder bore, and the piston stroke are 72.0 mm (2.83 in) and 73.6 mm (2.90 in), respectively. 

The Kubota D905 diesel engine delivered up to 23.8 PS (23.5 HP, 17.5 kW) 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

Kubota D905 Engine Specs

Kubota D905 (0.9 L) Diesel Engine Specifications

Engine Specifications

Engine codeD905
LayoutStraight-3, vertical
Fuel typeDiesel
Displacement0.9 L, 898 cm3 (54.8 cu in)
Fuel injection pumpBosch MD type mini fuel injection pump
Fuel nozzleMini nozzle
Starting systemElectric starting with 12V starter
Starting support deviceGlow plug in combustion chamber
GovernorAll speed mechanical governor
Power adderNone
Max. Horsepower23.8 PS (17.5 kW; 23.5 HP) at 3,600 rpm*
Torque output52.8 N·m (5.4 kg·m, 38.9 ft·lb) at 2,400 rpm*
Firing order1-2-3
Dimensions (L x W x H):498 x 397 x 609 mm (19.6 x 15.6 x 24 in)
Weight95 kg (210 lbs)

Cylinder head

Valve Arrangement:SOHC, gear drive
Valves:6 (2 valves per cylinder)
Valve head diameter:INTAKE
Valve length:INTAKE101.5 mm (3.99 in)
EXHAUST101.5 mm (3.99 in)
Valve stem diameter:INTAKE6.960-6.975 mm (0.274-0.2746 in)
EXHAUST6.960-6.975 mm (0.274-0.2746 in)
Valve spring free length:INTAKE37.0-37.5 mm (1.4567-1.4764 in)
EXHAUST37.0-37.5 mm (1.4567-1.4764 in)
Camshaft lobe height:INTAKE28.80 mm (1.1339 in)
EXHAUST29.00 mm (1.1417 in)
Camshaft journal diameter:35.934-35.950 mm (1.4147-1.4154 in)

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:Second0.085-0.112 mm (0.0033-0.0044 in)
Oil0.020-0.055 mm (0.0008-0.0022 in)
Piston ring end gap:Top0.250-0.400 mm (0.0098-0.0157 in)
Second0.250-0.400 mm (0.0098-0.0157 in)
Oil0.250-0.400 mm (0.0098-0.0157 in)
Piston pin outer diameter22.002-22.011 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)

Maintenance Data

Valve clearance (HOT)
Intake valve0.145-0.185 mm (0.0057-0.0073 in)
Exhaust valve0.145-0.185 mm (0.0057-0.0073 in)
Compression pressure
StandardD905-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 oilCF or higher
SAE Viscosity NumberSAE 10W-30, 10W-40
Engine oil capacity101 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.)

Also Check:

Final Words

This concludes our discussion of the Kubota D905 (0.9 L) Diesel Engine specs and review; however, if you have any questions regarding this article, please submit them in the comment section below. We will do our best to respond to you as soon as possible.

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