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Kubota V2403 Engine

General Technical Data

Kubota V2403 Engine Specifications

Engine model .......... Kubota V2403
Engine type .......... Vertical, water-cooled, 4-cylinder diesel
Number of cylinders .......... 4
Bore and stroke, mm (in.) .......... 87 x 102.4 (3.43 x 4.04)
Total displacement, L (cu.in.) .......... 2.44 (148.6)
Combustion chamber .......... Spherical Type (E-TVCS)
Gross power, kw (hp) .......... 35.8 (48.0)
Net power, kw (hp) .......... 31.1 (41.6)
Maximum speed, rpm .......... 2800
Iidling speed, rpm .......... 750-850
Firing Order .......... 1-3-4-2
Direction of rotation .......... Counter-clockwise
Compression ratio .......... 23.8
Compression Pressure .......... 2.95-3.23 MPa (427-469 psi)

Fuel System

Injection pump .......... Bosch Type mini pump
Injection pressure .......... 13.73 MPa, 1991 psi
Injection timing (Before T.D.C.) .......... 0.314 rad (18 deg)

Electrical System

Starting system .......... Cell starter (with glow plug)
Starting motor .......... 12V, 2.0 kW
Charging generator .......... 12V, 480W
Battery capacity .......... 12V, 100-120 AH

Dimensions

Length, mm (in.) .......... 670.9 (26.4)
Width, mm (in.) .......... 499.0 (19.7)
Height, mm (in.) .......... 684.5 (26.9)
Dry weight, kg (lbs.) .......... 184 (406)

Kubota V2403 Maintenance Data

Fuel type .......... Diesel Fuel No.2-D
Engine oil type .......... SAE 10W-30 or 15W-40
Engine oil capacity .......... 9.5 L (2.51 gals.)
Coolant capacity .......... 8.4 L (2.22 gals.)
Oil filter change interval .......... Every 150 hours
Fuel filter change interval .......... Every 250 hours
Fan belt tension (Deflection) .......... 7-9 mm (0.28-0.35 in.)

Kubota V2403 Service Specifications

Cylinder Block

Cylinder Bore (Oversize) I.D. .......... 87.250-87.272 mm (3.4351-3.4359 in.)
Cylinder Maximum I.D. to Cylinder Minimum I.D. (Difference) .......... 0.15 mm (0.0059 in.)
Cylinder Block Bore I.D. .......... 40.000-40.025 mm (1.5748-1.5757 in.)
Cam Height (Intake) .......... 33.47 mm (1.318 in.)
Cam Height (Exhaust) .......... 33.00 mm (1.299 in.)
Top Ring to Ring Groove, Clearance .......... 0.050-0.090 mm (0.0020-0.0035 in.)
Top Ring (Ring Gap) .......... 0.20-0.35 mm (0.0079-0.013 in.)
Second Ring to Ring Groove, Clearance .......... 0.0930-0.128 mm 0.00367-0.00503 in.
Oil Ring to Ring Groove, Clearance .......... 0.020-0.060 mm 0.00079-0.0023 in.
Second Ring (Ring Gap) .......... 0.40-0.55 mm 0.016-0.021 in.
Oil Ring (Ring Gap) .......... 0.25-0.45 mm 0.0099-0.017 in.
Crankshaft Journal to Crankshaft Bearing 1, Oil Clearance .......... 0.0400-0.118 mm (0.00158-0.00464 in.)
Crankshaft Journal O.D. .......... 59.921-59.940 mm (2.3591-2.3598 in.)
Crankshaft Bearing 1 I.D. .......... 59.980-60.039 mm (2.3615-2.3637 in.)
Crankshaft Journal to Crankshaft Bearing 2, Oil Clearance .......... 0.0400-0.104 mm (0.00158-0.00409 in.)
Crankshaft Journal O.D. .......... 59.921-59.940 mm (2.3591-2.3598 in.)
Crankshaft Bearing 2 I.D. .......... 59.980-60.025 mm (2.3615-2.3631 in.)
Crankpin to Crankpin Bearing, Oil Clearance .......... 0.025-0.087 mm (0.00099-0.0034 in.)

Cylinder Head

Valve Clearance (When Cold) .......... 0.18-0.22 mm (0.0071-0.0086 in.)
Top Clearance .......... 0.60-0.70 mm (0.024-0.027 in.)
Cylinder Head Surface Flatness .......... 0.05 mm / 500 mm (0.002 in. / 19.7 in.)
Valve Recessing Recessing .......... 0.65-0.85 mm (0.026-0.033 in.)
Valve Stem to Valve Guide, Clearance .......... 0.040-0.070 mm (0.0016-0.0027 in.)
Valve Spring (Setting Load / Setting Length) .......... 118 N / 35.0 mm (26.5 lbf / 1.38 in.)
Valve Spring Tilt .......... 1.0 mm (0.039 in.)
Valve Seat Width (Intake/Exhaust) .......... 2.12 mm (0.0835 in.)
Valve Seat Angle (Intake/Exhaust) .......... 0.79 rad (45 deg)
Tappet to Tappet Guide, Oil Clearance .......... 0.020-0.062 mm (0.00079-0.0024 in.)
Tappet O.D. .......... 23.959-23.980 mm (0.94327-0.94409 in.)
Tappet Guide I.D. .......... 24.000-24.021 mm (0.94489-0.94570 in.)

Oil System

Engine Oil Pressure At Idle Speed .......... More than 98 kPa (14 psi)
Engine Oil Pressure At Rated Speed .......... 300-440 kPa (43-64 psi)
Engine Oil Pressure Switch Working Pressure .......... 50 kPa (2 7 psi)
Inner Rotor to Outer Rotor, Clearance .......... 0.030-0.14 mm (0.0012-0.0055 in.)
Outer Rotor to Pump Body, Clearance .......... 0.11-0.19 mm (0.0044-0.0074 in.)
Inner Rotor to Cover, Clearance .......... 0.105-0.150 mm (0.00414-0.00590 in.)

Cooling System

Fan Belt Tension .......... 7.0-9.0 mm (0.28-0.35 in.) deflection at 98 N (22 lbf) of force
Thermostat Valve Opening Temperature (When the valve starts-open) .......... 80.5-83.5C (176.9-182.3F)
Thermostat Valve Opening Temperature (When the valve opened completely) .......... 95C (203F)
Radiator Water Tightness .......... No leak at specified pressure
Radiator Cap Pressure Decreasing Time .......... More than 10 sec. for pressure decrease from 90-60 kPa

Tightening Torque Specs

Injector clamp screw (M8x1.25), Nm (lb-ft) .......... 24-27 (18-20)
Cylinder head cover screw (M6x1.0), Nm (lb-ft) .......... 6.86-11.3 (5.06-8.33)
Injection pipe retaining nut (M12x1.5), Nm (lb-ft) .......... 24.5-29.4 (18.1-21.6)
Oil pressure switch screw (R1/8), Nm (lb-ft) .......... 15-19 (11-14)
Oil cooler joint screw (M20x1.5), Nm (lb-ft) .......... 40-44 (29-32)
Fan drive pulley mounting nut (M30x1.5), Nm (lb-ft) .......... 138-156 (102-115)
Camshaft set screw (M8x1.25), Nm (lb-ft) .......... 24-27 (18-20)
Balancer shaft set bolt (M8x1.25), Nm (lb-ft) .......... 24-27 (18-20)
Camshaft position sensor mounting screw, Nm (lb-ft) .......... 4-5 (3-4)
Crankshaft position sensor mounting screw, Nm (lb-ft) .......... 4-5 (3-4)
Rocker arm bracket screw (M8x1.25), Nm (lb-ft) .......... 24-27 (18-20)
Boost sensor mounting screw (M4x0.7), Nm (lb-ft) .......... 0.98-1.7 (0.73-1.3)
Glow lead mounting nut (M4x0.7), Nm (lb-ft) .......... 0.98-1.7 (0.73-1.3)
Glow plug (M10x1.25), Nm (lb-ft) .......... 15-19 (11-14)

KUBOTA TRACTORS TROUBLESHOOTING
L235	L2501	L2550	L275	L3110
L3301	L35	L3710	L3901	L4310
L5030	M4700	M5700	M6040	M6800
M8200	M8540	M9000	MX5100	MX5200