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Kubota EA300 Engine

General Technical Data

Kubota EA300 Engine Specifications

Engine Model ............... Kubota EA300
Engine Type ............... Horizontal water-cooled 4-cycle diesel engine
Number of Cylinders ............... 1
Displacement, cc (cu.in) ............... 309 (18.9)
Cylinder Bore, mm (in) ............... 75.0 (2.95)
Piston Stroke, mm (in) ............... 70.0 (2.76)
Rated Engine Power, hp (kW) ............... 7.0 (5.1)
Rated Engine Speed, rpm ............... 3000
Maximum Torque, Nm (ft-lbs) ............... 17.7 (13.1)
Torque Speed, rpm ............... 2000
Direction of Rotation ............... Counter-clockwise (facing flywheel)
Combustion System ............... Spherical type
Fuel System Type ............... Injection pump
Cooling System ............... Radiator
Lubrication System ............... Forced lubrication with trochoid pump
Starting System ............... Electric starter
Fuel Tank Capacity, L (gal) ............... 4.8 (1.3)
Oil Capacity, L (qts) ............... 1.3 (1.4)
Coolant Capacity, L (qts) ............... 1.2 (1.3)
Electrical System Rating, Volts ............... 12

Dimensions and Weight

Overall Length, mm (in) ............... 566 (22.6)
Overall Width, mm (in) ............... 411 (16.2)
Overall Height, mm (in) ............... 457 (18.0)
Net weight, kg (lbs) ............... 54 (119)

Kubota EA300 Maintenance Data

Engine Oil and Filters

Engine Oil Type ............... SAE 30, SAE 10W-30
Oil Classification (API Service) ............... CF, CF-4, or CG-4
Oil Capacity, L (qts) ............... 1.3 (1.4)
Fuel Filter Part Number ............... 15231-43560
Air Filter Part Number ............... 14971-11180

Service Intervals

Check Fuel Feed Piping ............... Every 50 hours
Change Engine Oil ............... Every 100 hours
Clean Fuel Filter ............... Every 100 hours
Clean Air Filter ............... Every 100 hours
Clean Radiator Fins ............... Every 100 hours
Clean Fuel Tank ............... Every 300 hours
Replace Fuel Filter ............... Every 500 hours
Replace Fan Belt ............... Every 500 hours
Check and Adjust Valve Clearance ............... Every 800 hours
Replace Air Filter ............... Every 1000 hours
Check Nozzle Injection Pressure ............... Every 1000 hours
Clean Injection Nozzle ............... Every 1500 hours
Change Engine Coolant ............... Every 1500 hours

Kubota EA300 Service Specifications

Cylinder Block

Cylinder Compression, MPa (psi) ............... 3.48 (505)
Cylinder Bore I.D (Std), mm (in) ............... 75.000-75.019 (2.9528-2.9535)
Cylinder Bore I.D (Wear Limit), mm (in) ............... 75.25 (2.9626)
Connecting Rod Alignment, mm (in) ............... 0.05 (0.0020)
Connecting Rod End Play, mm (in) ............... 2.9-3.3 (0.114-0.130)
Crankshaft Alignment, mm (in) ............... 0.04 (0.0016)
Crankshaft to Oil Filler Ring Clearance, mm (in) ............... 0.025-0.066 (0.00098-0.00260)
Crankshaft O.D, mm (in) ............... 34.959-34.975 (1.37634-1.37697)
Oil Filler Ring I.D, mm (in) ............... 35.000-35.025 (1.37795-1.37894)
Crankshaft End Play, mm (in) ............... 0.05-0.46 (0.0020-0.0181)
Crank Pin to Crank Pin Bearing Clearance, mm (in) ............... 0.019-0.077 (0.00075-0.00303)
Crank Pin O.D, mm (in) ............... 36.959-36.975 (1.45508-1.45571)
Crank Pin Bearing I.D, mm (in) ............... 36.994-37.036 (1.45646-1.45811)

Cylinder Head and Valves

Cylinder Head (Max Out-of-Flatness), mm (in) ............... 0.05 (0.002)
Cylinder Head Gasket Thickness, mm (in) ............... 1.05-1.20 (0.0413-0.0472)
Valve Clearance (Cold), mm (in) ............... 0.16-0.20 (0.0063-0.0079)
Valve Seat Width, mm (in) ............... 2.1 (0.083)
Valve Seat Angle, deg (rad) ............... 45 (0.785)
Valve Face Angle, deg (rad) ............... 45.5 (0.794)
Valve Recessing, mm (in) ............... 0.8-0.9 (0.031-0.035)
Valve Stem to Valve Guide Clearance, mm (in) ............... 0.035-0.065 (0.00138-0.00256)
Valve Stem O.D, mm (in) ............... 6.960-6.975 (0.27402-0.27461)
Valve Guide I.D, mm (in) ............... 7.010-7.025 (0.27598-0.27657)
Valve Spring Free Length, mm (in) ............... 34.5 (1.358)
Rocker Arm Shaft to Rocker Arm I.D Clearance, mm (in) ............... 0.016-0.045 (0.0006-0.0018)
Rocker Arm Shaft O.D, mm (in) ............... 10.973-10.984 (0.4320-0.4324)
Rocker Arm I.D, mm (in) ............... 11.000-11.018 (0.4331-0.4338)
Tappet and Guide Clearance, mm (in) ............... 0.020-0.062 (0.00079-0.00244)
Tappet O.D, mm (in) ............... 19.959-19.980 (0.78579-0.78661)
Tappet Guide I.D, mm (in) ............... 20.000-20.021 (0.78740-0.78823)
Camshaft Journal Clearance (Flywheel Side), mm (in) ............... 0.020-0.054 (0.00079-0.00213)
Camshaft Journal O.D (Flywheel Side), mm (in) ............... 21.967-21.980 (0.86484-0.86535)
Camshaft Bore l.D (Flywheel Side), mm (in) ............... 22.000-22.021 (0.86614-0.86697)
Camshaft Journal Clearance (Gear Side), mm (in) ............... 0.025-0.066 (0.00098-0.00260)
Camshaft Journal O.D (Gear Side), mm (in) ............... 32.959-32.975 (1.29760-1.29823)
Camshaft Bore l.D (Gear Side), mm (in) ............... 33.000-33.025 (1.29921-1.30020)
Cam Height (Standard), mm (in) ............... 27.0 (1.063)
Cam Height (Wear Limit), mm (in) ............... 26.5 (1.0433)

Piston and Piston Rings

Piston Skirt O.D, mm (in) ............... 74.925-74.945 (2.94980-2.95059)
Piston Pin Bore I.D, mm (in) ............... 20.000-20.013 (0.78740-0.78791)
Compression Ring Groove Clearance, mm (in) ............... 0.085-0.112 (0.00335-0.00441)
Compression Ring Groove Width, mm (in) ............... 1.555-1.570 (0.06122-0.06181)
Compression Ring Width, mm (in) ............... 1.458-1.470 (0.05740-0.05787)
Oil Ring Groove Clearance, mm (in) ............... 0.020-0.055 (0.00079-0.00217)
Oil Ring Groove Width, mm (in) ............... 4.01-4.03 (0.1579-0.1587)
OIl Ring Width, mm (in) ............... 3.975-3.990 (0.15650-0.15709)
Top Ring End Gap, mm (in) ............... 0.30-0.45 (0.0118-0.0177)
Second Ring End Gap, mm (in) ............... 0.30-0.45 (0.0118-0.0177)
Oil Ring End Gap, mm (in) ............... 0.25-0.40 (0.0098-0.0157)

Kubota EA300 Tightening Torque Specs

Cylinder head nut (M9x1.25), Nm (ft-lb) ............... 56.9-61.8 (43.4-47)
Connecting rod screws (M7x0.75), Nm (ft-lb) ............... 26.5-30.4 (19.5-22.4)
Flywheel nut (M20x1.5), Nm (ft-lb) ............... 137-157 (101-116)
Crankcase cover mounting screw (M6x1.0), Nm (ft-lb) ............... 7.9-9.3 (5.8-6.9)
Gear case mounting screw (M6x1.0), Nm (ft-lb) ............... 9.8-11.3 (7.2-8.3)
Idle gear shaft screw (M6x1.0), Nm (ft-lb) ............... 9.8 to 11.3 (7.2-8.3)
Head cover mounting nut (M7x1.0), Nm (ft-lb) ............... 9.8-10.8 (7.2-8)
Rocker arm bracket mounting nut (M7x1.0), Nm (ft-lb) ............... 16.7-20.6 (12.3-15.2)
Injection pump mounting screw (M6x1.0), Nm (ft-lb) ............... 9.8-11.3 (7.2-8.3)
Nozzle holder (M20x1.5), Nm (ft-lb) ............... 49-69 (36-51)
Muffler mounting bolt (M8x1.25), Nm (ft-lb) ............... 23.5-27.5 (17.4-20.3)
Tension pulley remer screw (M8x1.25), Nm (ft-lb) ............... 19.6-23.5 (14.5-17.4)
Air cleaner mounting bolt (M6x1.0), Nm (ft-lb) ............... 2.9-4.9 (2.2-3.6)
Injection pipe nut (M12x1.5), Nm (ft-lb) ............... 24.5-34.3 (18.1-25.3)
Glow plug (M8x1.0), Nm (ft-lb) ............... 7.85-14.7 (14.5-18.1)

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