Kubota D1105

Kubota D1105The Kubota D1105 is a 1.1 L (1,123 cc, 68.5 cu·in) natural aspirated three-cylinders four-stroke liquid-cooled internal combustion small diesel engine, manufactured by Kubota for general-purpose applications.

A 78.0 mm (3.07 in) cylinder bore and 78.4 mm (3.09 in) piston stroke give the D1105 engine a total of 1,123 cc of displacement. The compression ratio rating is 22.0:1 for model D1105-B(E) or 24.0:1 for models D1105-E2B,-E3B,-E4B.

The Kubota D1105 diesel engine produced 25.4 PS (18.7 kW; 25.0 HP) at 3,000 rpm of net output power and 68.3 N·m (7 kg·m, 50.3 ft·lb) at 2,000 rpm of peak torque.

The Kubota D1105 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 modelD1105
Engine type4-stroke, vertical, three-cylinders
Displacement1.1 L, 1,123 cm3, (68.5 cu·in)
Max. horsepower25.4 PS (18.7 kW; 25.0 HP) at 3,000 rpm
Max. torque68.3 N·m (7 kg·m, 50.3 ft·lb) at 2,000 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: D1105-B(E): 22.0:1
D1105-E2B, D1105-E3B, D1105-E4B: 24.0:1
Cylinder bore:78.0 mm (3.07 in)
Piston stroke:78.4 mm (3.09 in)
Cylinder internal diameter (standard):78.00-78.019 mm (3.0709-3.0716 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):0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Second):0.300-0.450 mm (0.0118-0.0177 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:OHV, 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

Idle speed:900 rpm
Maximum speed:3,000-3,800 rpm (depending on modification)
Cylinder compression: D1105-B(E): 2.84 to 3.23 MPa, 29.0 to 33.0 kgf/cm2, 412 to 469 psi
D1105-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 to 14.70 MPa; 140.0 to 150.0 kgf/cm2; 1992 to 2133 psi
Cooling system
Coolant capacity3.1 L (3.3 US.qts, 2.7 Imp. qts)
Electrical system
Battery:12V, 60Ah or equivalent
Starting motor: D1105-B(E), -E2B: 12 V, 1.0 kW
D1105-E3B, -E4B: 12 V, 1.2 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: D1105-B(E), -E2B: 12 V, 360 W
D1105-E3B, -E4B: 12 V, 480 W
Alternator (no-load voltage):AC 13,5V at 5,000 rpm


Manufacturer or BrandModels
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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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