Kubota V1502

Kubota V1502The Kubota V1502 is a 1.5 L (1,487 cc, 90.7 cu·in) straight-four, water-cooled naturally aspirated vertical diesel engine manufactured by Kubota.

The Kubota V1502 engine has a spherical type сombustion сhamber, Bosch K-type mini fuel injection pump, and the DN12 SD12 injection nozzle. The cylinder bore and the piston stroke are 76.0 mm (2.99 in) and 82.0 mm (3.23 in), respectively. The engine features a high-durability tunnel-type cylinder block with dry-type cylinder liners.

The V1502 diesel engine produced 34.5 PS (25.4 kW; 34.0 HP) at 2,800 rpm of gross horsepower.

The breakdown of the engine code is as follows:

  • V – 4-cylinders
  • 15 – Approximate displacement 1500 cc

General information

Engine Specifications
Engine code V1502-B
Layout Straight-4, vertical diesel engine
Fuel type Diesel fuel No.2-D
Production –
Displacement 1.5 L, 1,487 cm3 (90.74 cu in)
Fuel injection pump Bosch K-type mini fuel injection pump
Fuel nozzle DN12 SD12
Starting system Electric starting with 12V (1.4 kW) starter
Starting support device Glow plug
Governor Centrifugal ball mechanical governor
Power adder None
Max. Horsepower 34.5 PS (25.4 kW; 34.0 HP) at 2,800 rpm
Torque output –
Firing order 1-2-3
Dimensions (L x W x H): 662 x 512 x 631.5 mm (26.1 x 20.2 x 24.9 in)
Weight 175.7 kg (387.4 lbs)

Cylinder block

Cylinder block
Compression ratio: 21.0:1
Cylinder bore: 76.0 mm (2.99 in)
Piston stroke: 82.0 mm (3.23 in)
Number of piston rings (compression / oil): 2 / 1
Cylinder inner diameter: 76.000-76.022 mm (2.9921-2.993 in)
Piston skirt diameter –
Piston ring side clearance: Second 0.093-0.120 mm (0.0037-0.0047 in)
Oil 0.020-0.052 mm (0.0008-0.0020 in)
Piston ring end gap: Top 0.300-0.450 mm (0.0118-0.0177 in)
Second 0.300-0.450 mm (0.0118-0.0177 in)
Oil 0.250-0.450 mm (0.0099-0.0177 in)
Piston pin outer diameter 23.002-23.011 mm (0.9056-0.9059 in)
Crankshaft main journal diameter: 51.921-51.940 mm (2.0441-2.0449 in)
Crankpin diameter: 43.959-43 975 mm (1.7307-1.7313 in)

Cylinder head

Cylinder head
Valve Arrangement: OHV, gear drive
Valves: 6 (2 valves per cylinder)
Valve timing: INTAKE –
EXHAUST –
Valve seat width: INTAKE 2.10 mm (0.0827 in)
EXHAUST 2.10 mm (0.0827 in)
Valve stem diameter: INTAKE 7.960-7.975 mm (0.3134-0.3140 in)
EXHAUST 7.960-7.975 mm (0.3134-0.3140 in)
Valve spring free length: INTAKE 41.7-42.2 mm (1.6417-1.6614 in)
EXHAUST 41.7-42.2 mm (1.6417-1.6614 in)
Camshaft cam height: INTAKE 33.360-33.310 mm (1.3134-1.3114 in)
EXHAUST 33.360-33.310 mm (1.3134-1.3114 in)
Camshaft journal diameter: 39.934-39.950 mm (1.5722-1.5728 in)

Tightening torque

Tightening torque specs
Rocker сover cup nuts: 6.9-8.8 Nm (0.7-0.9 kgf-m, 5.1-6.5 lb-ft)
Rocker arm bracket nuts: 23.5-27.5 Nm (2.4-2.8 kgf-m, 17.4-20.3 lb-ft)
Cylinder head: Bolt and washer (s/n before 7433):
78.5-83.4 Nm (8.0-8.5 kgf-m, 57.8-61.5 lb-ft)
Flanged bolt (s/n after 7434):
93.2-98.1 Nm (9.5-10.0 kgf-m, 68.7-72.3 lb-ft)
Nozzle holder assembly: 29.4-49.0 Nm (3.0-5.0 kgf-m, 21.7-36.2 lb-ft)
Connecting rod bolts: Non-flanged bolt:
36.3-41.2 Nm (3.7-4.2 kgf-m, 26.6-30.4 lb-ft)
Flanged bolt:
44.1-49.0 Nm (4.5-5.0 kgf-m, 32.5-36.2 lb-ft)
Flywheel bolts: 98.1-107.9 Nm (10.0-11.0 kgf-m, 72.3-79.6 lb-ft)
Main bearing case bolts 2: Bolt and washer (s/n before 20822):
63.7-68.6 Nm (6.0-7.0 kgf-m, 47.0-50.6 lb-ft)
Flanged bolt (s/n after 20823):
68.6-73.5 Nm (7.0-7.5 kgf-m, 50.6-54.2 lb-ft)
Main bearing case bolts 1: Bolt and washer (s/n before 20589):
29.4-34.3 Nm (3.0-3.5 kgf-m, 21.7-25.3 lb-ft)
Flanged bolt (s/n after 20590):
36.3-41.2 Nm (3.7-4.2 kgf-m, 26.8-30.4 lb-ft)

Maintenance data

Valve clearance
Intake valve 0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve 0.18-0.22 mm (0.0071-0.0087 in)
Compression pressure
Standard 30.0-33.0 kgf/cm2 (2.9-3.2 MPa, 427-469 psi)
Oil system
Recommended engine oil CD or CE
SAE Viscosity Number SAE 10W-30, 10W-40
Engine oil capacity 8.0 L (8.45 US. qt, 7.04 Imp. qt.)
Fuel system
Injection timing: 23-25° B.T.D.C.
Fuel injection pressure 13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Thermostat’s valve opening temperature: 80.5-83.5°C (157.1-162.5°F)
Temperature at which thermostat completely opens: 95°C (203°F)
Electrical system
Battery: 12V, 110Ah or equivalent
Alternator current output: 25A/14V at 4,000 rpm
Alternator brush Length (std/min): 15.5 mm (0.6102 in)/10.3 mm (0.4055 in)
Glow plug resistance: Approx 1.5 Ω
Starter motor (no-load test): Current: 90A or less
Voltage: 11.5V
Speed: 3,500 rpm or more
Commutator outer diameter (std/min): 30.0 mm (1.1811 in) / 29.0 mm (1.1417 in)
Starter motor mica undercutting (std/min): 0.5-0.9 mm (0.0197-0.0354 in) / 0.2 mm (0.0079 in)
Starter motor brush length (std/min): 19.0 mm (0.7480 in) / 12.7 mm (0.5000 in)
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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