Kubota V1502

Kubota V1502The Kubota V1502 is a 1.5 L (1,487 cc, 90.7 cu·in) natural aspirated four-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.

A 76.0 mm (2.99 in) cylinder bore and 82.0 mm (3.23 in) piston stroke give the V1502 engine a total of 1487 cc of displacement. The compression ratio rating is 21.0:1.

The V1502 engine produced 30.5 PS (22.4 kW; 30.0 HP) at 2,800 rpm of the net (intermittent) horsepower and 34.5 PS (25.4 kW; 34.0 HP) at 2,800 rpm of gross (intermittent) horsepower.

The Kubota V1502 features:

  • Spherical type combustion chamber
  • Bosch K-type mini fuel injection pump
  • DN12 SD12 injection nozzle
  • Centrifugal ball mechanical governor
  • Forced lubrication by pump
  • Liquid cooling system forced circulation with water pump
  • Electric starter (12V, 1.4 kW)
  • Charging alternator (12V, 300 W)

General information

Engine Specifications
Engine modelV1502-B
Engine type4-stroke, vertical, four-cylinders
Displacement1.5 L, 1,487 cm3, (90.7 cu·in)
Max. horsepower Net (intermittent): 30.5 PS (22.4 kW; 30.0 HP) at 2,800 rpm
Gross (intermittent): 34.5 PS (25.4 kW; 34.0 HP) at 2,800 rpm
Max. torque
Cooling systemLiquid-cooled
Lubricating systemForced lubrication by pump
Combustion chamberSpherical type
Fuel injection pumpBosch K-type mini pump
Injection nozzleDN12 SD12
Fuel usedDiesel fuel No.2-D
Starting systemElectric starter (12V, 1.4 kW)
Starting support deviceGlow plug
GovernorCentrifugal ball mechanical governor
PTO shaft rotationCounterclockwise (from PTO shaft side)
Dimensions (L x W X H)662 x 512 x 631.5 mm (26.1 x 20.2 x 24.9 in)
Dry weight175.7 kg (387.4 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:21.0:1
Cylinder bore:76.0 mm (2.99 in)
Piston stroke:82.0 mm (3.23 in)
Cylinder internal diameter (standard):76.000-76.022 mm (2.9921-2.993 in)
Number of piston rings (compression / oil):2/1
Connecting rod small end diameter (standard):23.025-23.040 mm (0.9065-0.9071 in)
Piston pin diameter:23.002-23.011 mm (0.9056-0.9059 in)
Side clearance (Second):0.093-0.120 mm (0.0037-0.0047 in)
Side clearance (Oil):0.020-0.052 mm (0.0008-0.0020 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):0.250-0.450 mm (0.0099-0.0177 in)
Number of main bearings:3
Crankshaft main journal diameter:51.921-51.940 mm (2.0441-2.0449 in)
Crankpin journal diameter:43.959-43 975 mm (1.7307-1.7313 in)
Cylinder head
Valves:2(6 valves in total)
Valve seat width (INTAKE):2.100 mm (0.0827 in)
Valve seat width (EXHAUST):2.100 mm (0.0827 in)
Value seat angle (INTAKE):45°
Value seat angle (EXHAUST):45°
Valve steam diameter (INTAKE):7.960-7.975 mm (0.3134-0.3140 in)
Valve steam diameter (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)
Valve spring free length (EXHAUST):41.7-42.2 mm (1.6417-1.6614 in)
Rocker arm shaft outer diameter:13.973-13.984 mm (0.5501-0.5506 in)
Camshaft cam height (INTAKE):33.360-33.310 mm (1.3134-1.3114 in)
Camshaft cam height (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)

Service Data

Maximum speed:3,000 rpm
Idle speed:800 rpm
Cylinder compression:30.0-33.0 kgf/cm2 (2.9-3.2 MPa, 427-469 psi)
Compression differential limit between cylinders:10% or less
Valve clearance
Intake valve clearance:0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve clearance:0.18-0.22 mm (0.0071-0.0087 in)
Oil system
Lubrication system:Forced lubrication by pump
Oil type:API CD or CE
Oil capacity:8.0 L (8.45 US. qt, 7.04 Imp. qt.)
Oil filter:Full flow
Fuel system
Fuel injection pumpBosch K-type mini pump
Injection nozzleDN12 SD12
Injection timing:23-25° B.T.D.C.
Fuel injection pressure13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Type:Pressurized radiator (not included in the basic engine), forced circulation with water pump
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)
Starter motor (no-load test): Current: 90A or less
Voltage: 11.5V
Speed: 6,000 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)
Glow plug resistance:Approx 1.5 Ω
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 is an informational database of technical specifications, we are not a parts supplier or a marketplace.

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.

Be the first to comment

Leave a Reply

Your email address will not be published.