Kubota V1702

Kubota V1702The Kubota V1702 is a 1.7 L (1,732 cc, 105.7 cu·in) natural aspirated four-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota for general-purpose applications.

It has an 82.0 mm (3.23 in) cylinder bore and 82.0 mm (3.23 in) piston stroke. The compression ratio rating is 21.0:1.

The V1702 engine produced 36.6 PS (26.9 kW; 36.0 HP) at 2,800 rpm of net (intermittent) horsepower and 40.5 PS (29.8 kW; 40.0 HP) at 2,800 rpm of gross (intermittent) horsepower.

The Kubota V1702 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 modelV1702-B
Engine type4-stroke, vertical, four-cylinders
Displacement1.7 L, 1,732 cm3, (105.7 cu·in)
Max. horsepower Net (intermittent): 36.6 PS (26.9 kW; 36.0 HP) at 2,800 rpm
Gross (intermittent): 40.5 PS (29.8 kW; 40.0 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)652 x 512 x 631.5 mm (25.7 x 20.2 x 24.9 in)
Dry weight177.1 kg (390.4 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio:21.0:1
Cylinder bore:82.0 mm (3.23 in)
Piston stroke:82.0 mm (3.23 in)
Cylinder internal diameter (standard):82.000-82.022 mm (3.2283-3.2292 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 1247):
78.5-83.4 Nm (8.0-8.5 kgf-m, 57.8-61.5 lb-ft)
Flanged bolt (s/n after 1248):
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 43698):
63.7-68.6 Nm (6.0-7.0 kgf-m, 47.0-50.6 lb-ft)
Flanged bolt (s/n after 43699):
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 42863):
29.4-34.3 Nm (3.0-3.5 kgf-m, 21.7-25.3 lb-ft)
Flanged bolt (s/n after 42864):
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:8.5 L (8.98 US. qt, 7.48 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.

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