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Kubota OC60-E2 Engine

General Technical Data

Kubota OC60 Engine Specifications

Engine Model ............... Kubota OC60-E2
Engine Type ............... Oil-cooled 4-cycle diesel engine
Number of Cylinders ............... 1
Displacement, cc (cu.in) ............... 276 (16.8)
Cylinder Bore, mm (in) ............... 72.0 (2.83)
Piston Stroke, mm (in) ............... 68.0 (2.68)
Rated Engine Power, hp (kW) ............... 6.1 (4.5)
Rated Engine Speed, rpm ............... 3600
Maximum Torque, Nm (ft-lbs) ............... 13.7 (10.2)
Torque Speed, rpm ............... 2400
Compression Ratio ............... 24.5:1
Direction of Rotation ............... Clockwise (View from flywheel side)
Cooling System ............... Oil cooling and air cooling
Starting System ............... Electric starter
Fuel Tank Capacity, L (gal) ............... 3.6 (0.95)
Oil Capacity, L (qts) ............... 1.4 (1.3)
Electrical System Rating, Volts ............... 12

Fuel System

Fuel System Type ............... Injection pump
Injection Pump Model ............... DN4PD82 (Denso)
Injection Timing, deg (rad) ............... 15-17 (0.26-0.30) BTDC
Injection Pressure, Mpa (psi) ............... 13.7 (1987)
Governor Type ............... Centrifugal, mechanical

Lubrication System

Lubrication System ............... Forced lubrication with trochoid pump
Oil Filter Type ............... Oil strainer
Engine Oil Pressure (Idle Speed), kPa (psi) ............... 49 (7)
Engine Oil Pressure (Rated Speed), kPa (psi) ............... 147-490 (21-71)
Inner Rotor to Outer Rotor Clearance, mm (in) ............... 0.15 (0.0059)
Outer Rotor to Pump Body Clearance, mm (in) ............... 0.090-0.171 (0.0035-0.0067)

Dimensions and Weight

Overall Length, mm (in) ............... 461 (18.2)
Overall Width, mm (in) ............... 403 (15.9)
Overall Height, mm (in) ............... 458 (18.1)
Net weight, kg (lbs) ............... 38.0 (83.8)

Kubota OC60 Maintenance Data

Engine Oil and Filters

Engine Oil Type ............... SAE 10W-30, 10W-40
Oil Classification (API Service) ............... CC or higher
Oil Capacity, L (qts) ............... 1.3 (1.4)
Fuel Filter Element Part Number ............... 1T021-43560
Air Filter Part Number ............... 11420-11182

Service Intervals

Check rubber hoses and clamp bands ............... Every 50 hours
Change Engine Oil ............... Every 100 hours
Clean Fuel Filter ............... Every 100 hours
Clean Air Cleaner ............... Every 100 hours
Clean Oil Strainer ............... Every 100 hours
Replace Fuel Filter ............... Every 500 hours
Replace Air Cleaner ............... Every 600 hours
Check and Adjust Valve Clearance ............... Every 800 hours
Check Nozzle Injection Pressure ............... Every 800 hours
Clean Injection Nozzle ............... Every 1500 hours

Kubota OC60 Service Specifications

Cylinder Block

Cylinder Compression, MPa (psi) ............... 3.43-3.92 (498 to 569)
Cylinder Bore I.D (Std), mm (in) ............... 72.000-72.019 (2.8346-2.8354)
Cylinder Bore I.D (Wear Limit), mm (in) ............... 72.10 (2.839)
Connecting Rod Alignment, mm (in) ............... 0.05 (0.0020)
Connecting Rod Small End to Piston Pin Clearance, mm (in) ............... 0.012-0.040 (0.0005-0.0016)
Connecting Rod Small End I.D, mm (in) ............... 20.025-20.040 (0.7884-0.7890)
Crankshaft Alignment, mm (in) ............... 0.02 (0.0008)
Crankshaft Journal to Bearing Oil Clearance, mm (in) ............... 0.028-0.090 (0.0011-0.0035)
Crank Pin to Crank Pin Bearing Oil Clearance, mm (in) ............... 0.025-0.087 (0.0010-0.0034)
Crankshaft O.D, mm (in) ............... 35.959-35.975 (1.4157-1.4163)
Crankshaft Bearing I.D, mm (in) ............... 36.000-36.046 (1.4173-1.4191)
Crankshaft Side Clearance, mm (in) ............... 0.05-0.20 (0.0020-0.0079)
Piston Pin Bore, mm (in) ............... 20.000-20.013 (0.7874-0.7879)
Compression Ring Groove Clearance (Standard), mm (in) ............... 0.030-0.065 (0.0012-0.0026)
Compression Ring Groove Clearance (Wear Limit), mm (in) ............... 0.15 (0.0059)
Compression Ring Groove Width, mm (in) ............... 1.520-1.535 (0.0598-0.0604)
Compression Ring Width, mm (in) ............... 1.470-1.490 (0.0579-0.0587)
Oil Ring Groove Clearance (Standard), mm (in) ............... 0.020-0.055 (0.0008-0.0022)
Oil Ring Groove Clearance (Wear Limit), mm (in) ............... 0.15 (0.0059)
Oil Ring Groove Width, mm (in) ............... 3.510-3.525 (0.1382-0.1388)
OIl Ring Width, mm (in) ............... 3.470-3.490 (0.1366-0.1374)
Ring End Gap (Compression Ring 1), mm (in) ............... 0.15-0.30 (0.0059-0.0118)
Ring End Gap (Compression Ring 2), mm (in) ............... 0.25-0.45 (0.0098-0.0177)
Ring End Gap (Oil Ring), mm (in) ............... 0.25-0.40 (0.0098-0.0157)

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) ............... 0.14-0.18 (0.0055-0.0071)
Valve Seat Width, mm (in) ............... 2.12 (0.0835)
Valve Seat Angle, deg (rad) ............... 45 (0.785)
Valve Face Angle, deg (rad) ............... 45.5 (0.794)
Valve Recessing, mm (in) ............... 0.60-0.85 (0.0236-0.0335)
Valve Stem to Valve Guide Clearance, mm (in) ............... 0.030-0.057 (0.0012-0.0022)
Valve Stem O.D, mm (in) ............... 5.968-5.980 (0.2350-0.2354)
Valve Guide I.D, mm (in) ............... 6.010-6.025 (0.2366-0.2372)
Intake Valve Open, deg (rad) ............... 20 (0.35) before TDC
Intake Valve Close, deg (rad) ............... 49 (0.86) after BDC
Exhaust Valve Open, deg (rad) ............... 54 (0.94) before BDC
Exhaust Valve Close, deg (rad) ............... 15 (0.26) after TDC
Valve Spring Free Length, mm (in) ............... 31.3-31.8 (1.2323-1.2520)
Rocker Arm Shaft to Shaft Hole Clearance, mm (in) ............... 0.016-0.045 (0.0006-0.0018)
Rocker Arm Shaft O.D, mm (in) ............... 11.973-11.984 (0.4714-0.4718)
Rocker Arm Shaft Hole I.D, mm (in) ............... 12.000-12.018 (0.4724-0.4731)
Tappet and Guide Clearance, mm (in) ............... 0.018-0.058 (0.0007-0.0023)
Tappet O.D, mm (in) ............... 7.972-7.987 (0.3139-0.3144)
Tappet Guide I.D, mm (in) ............... 8.005-8.030 (0.3152-0.3161)
Camshaft Journal Clearance, mm (in) ............... 0.016-0.045 (0.0006-0.0018)
Camshaft Journal O.D, mm (in) ............... 16.989-17.000 (0.6689-0.6693)
Camshaft Side Clearance, mm (in) ............... 0.05-0.20 (0.0020-0.0079)
Cam Height (Standard), mm (in) ............... 27.0 (1.0630)
Cam Height (Wear Limit), mm (in) ............... 26.5 (1.0433)

Balancer Gears

Balancer Gear 1/Balancer Gear 2, mm (in) ............... 0.033-0.170 (0.0013-0.0067)
Balancer Shaft to Balancer Bearing Clearance, mm (in) ............... 0.016-0.042 ( 0.0006-0.0017)
Balancer Shaft O.D, mm (in) ............... 13.992-14.000 (0.5509-0.5512)
Bearing I.D, mm (in) ............... 14.016-14.034 (0.5518-0.5525)
Balancer Gear Side Clearance (Standard), mm (in) ............... 0.12-0.37 (0.0047-0.0146)
Balancer Gear Side Clearance (Wear Limit), mm (in) ............... 0.5 (0.0197)

Kubota OC60 Tightening Torque Specs

Cylinder head screws (M10x1.5), Nm (ft-lb) ............... 51.9-56.8 (38.3-42)
Connecting rod screws (M7x1.0), Nm (ft-lb) ............... 18.6-21.6 (13.7-15.9)
Flywheel nut (M20x1.5), Nm (ft-lb) ............... 137-157 (101-116)
Side cover screws (M8x1.25), Nm (ft-lb) ............... 23.5-27.4 (17.4-20.3)
Rocker arm bracket mounting nut (M8x1.25), Nm (ft-lb) ............... 23.5-27.4 (17.4-20.3)
Injection pump mounting screw (M6x1.0), Nm (ft-lb) ............... 9.8-11.3 (7.2-8.3)
Injection pump eye joint bolt (M10x1.0), Nm (ft-lb) ............... 14.7-19.6 (10.8-14.5)
Injection pipe retaining nuts (M12x1.5), Nm (ft-lb) ............... 24.5-34.3 (18.1-25.3)
Oil pipe eye joint bolt (M12x1.25), Nm (ft-lb) ............... 24.5-29.4 (18.1-21.7)
Grow plug (M10x1.25), Nm (ft-lb) ............... 19.6-24.5 (14.5-18.1)
Nozzle holder mounting nuts (M8x1.25), Nm (ft-lb) ............... 13.72-17.6 (10.1-13)
Oil switch taper screw (PT1/8), Nm (ft-lb) ............... 14.7-19.6 (10.8-14.5)
Exhaust manifold mounting nuts (M8x1.25), Nm (ft-lb) ............... 23.5-27.4 (17.4-20.3)

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