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Kubota Z600 Specifications

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• Kubota Z600 Engine Specifications
• Kubota Z600 Engine Troubleshooting

Engine Model .............. Kubota Z600
Engine Type .............. 4-cycle 2-cylinder liquid-cooled diesel
Number of cylinders .............. 2
Cylinder Bore, mm (in) .............. 72.0 (2.83)
Piston Stroke, mm (in) .............. 70.0 (2.76)
Total displacement, L (cu.in) .............. 0.57 (34.8)
Gross power, kw (hp) .............. 10.4 (13.8)
Net power, kw (hp) .............. 9.3 (12.5)
Maximum speed, rpm .............. 3500
Idling speed, rpm .............. 800
Maximum torque, Nm (ft-lb) .............. 32.9 (24.3)
Torque speed, rpm .............. 2000
Combustion Chamber .............. Spherical type
Direction of rotation .............. Counter-clockwise
Compression ratio .............. 22:1
Firing order .............. 1-2
Lubricating system .............. Forced lubrication by pump
Oil pressure indicating .............. Electrical type switch
Oil filter .............. Full flow paper filter (cartridge type)
Starting system .............. Electric starting with starter
Electrical system rating, Volts ............... 12

Fuel System .............. Fuel injection
Fuel injection pump .............. Bosch K type mini pump
Injection nozzle .............. Bosch Throttle type
Governor type .............. Centrifugal ball mechanical governor

Overall Length, mm (in) .............. 520 (20.6)
Overall Width, mm (in) .............. 389 (15.4)
Overall Height, mm (in) .............. 504 (19.9)
Dry weight, kg (lbs.) .............. 70.5 (156)

Compression pressure, MPa (psi) .............. 3.09-2.32 (448-337)
Cylinder liner I.D, mm (in) .............. 72.000-72.019 (2.8347-2.8354)
Oversized cylinder liner I.D, mm (in) .............. +0.5 (0.0197)
Rocker arm shaft to bearing clearance, mm (in) .............. 0.020-0.062 (0.0008-0.0024)
Rocker arm shaft O.D, mm (in) .............. 10.973-10.984 (0.4320-0.4324)
Rocker arm bearing I.D, mm (in) .............. 11.000-11.041 (0.4331-0.4347)
Clearance between tappet and guide, mm (in) .............. 0.020-0.062 (0.0008-0.0024)
Tappet O.D, mm (in) .............. 19.959-19.980 (0.7858-0.7866)
Connecting rod alignment, mm (in) .............. 0.05 (0.0020)
Piston pin to small end bushing clearance, mm (in) .............. 0.014-0.038 (0.0006-0.0015)
Piston pin O.D, mm (in) .............. 20.002-20.011 (0.7875-0.7878)
Connecting rod small end bushing I.D, mm (in) .............. 20.025-20.040 (0.7884-0.7890)
Crankshaft alignment, mm (in) .............. 0.02 (0.0008)
Crankshaft bearing 1 oil clearance, mm (in) .............. 0.034-0.106 (0.0013-0.0042)
Crankshaft O.D, mm (in) .............. 43.934-43.950 (1.7297-1.7303)
Crankshaft bearing 1 I.D, mm (in) .............. 43.984-44.040 (1.7317-1.7339)
Crankshaft bearing 2 oil clearance, mm (in) .............. 0.034-0.092 (0.0013-0.0036)
Crankshaft bearing 2 I.D, mm (in) .............. 43.984-44.026 (1.7317-1.7333)
Crankpin bearing oil clearance, mm (in) .............. 0.029-0.087 (0.0011-0.0034)
Crankpin O.D, mm (in) .............. 36.959-36.975 (1.4551-1.4557)
Crankpin bearing I.D, mm (in) .............. 37.004-37.046 (1.4569-1.4585)
Crankshaft side clearance, mm (in) .............. 0.15-0.31 (0.0059-0.0122)
Crankshaft sleeve wear, mm (in) .............. 0.1 (0.0039)

Cylinder head surface flatness, mm (in) .............. 0.05 (0.0019)
Top clearance, mm (in) .............. 0.6-0.8 (0.0237-0.0315)
Cylinder head gasket shim thickness, mm (in) .............. 0.2 (0.0079)
Cylinder head gasket thickness (Free), mm (in) .............. 1.15-1.30 (0.0453-0.0512)
Cylinder head gasket thickness (Tightened), mm (in) .............. 1.05-1.15 (0.0413-0.0453)
Compression pressure, MPa (psi) .............. 3.09-2.32 (448-337)
Valve clearance (Cold), mm (in) .............. 0.145-0.185 (0.0057-0.0072)
Intake/exhaust valve seat width, mm (in) .............. 2.12 (0.0835)
Intake/exhaust valve seat angle, deg (rad) .............. 45 (0.785)
Intake/exhaust valve-face angle, deg (rad) .............. 45.5 (0.794)
Valve recessing, mm (in) .............. 0.9-1.1 (0.036-0.043)
Valve stem to valve guide clearance, mm (in) .............. 0.035-0.065 (0.0014-0.0025)
Valve stem O.D, mm (in) .............. 6.960-6.975 (0.2741-0.2746)
Valve guide I.D, mm (in) .............. 7.010-7.025 (0.2760-0.2765)
Intake valve (Open), deg (rad) .............. 20 (0.35) before T.D.C
Intake valve (Close), deg (rad) .............. 45 (0.79) after B.D.C
Exhaust valve (Open), deg (rad) .............. 50 (0.87) before T.D.C
Exhaust valve (Close), deg (rad) .............. 15 (0.26) after B.D.C
Valve spring free length, mm (in) .............. 35.1-35.6 (1.382-1.401)
Valve spring tilt, mm (in) .............. 1.3 (0.051)
Camshaft side clearance, mm (in) .............. 0.07-0.22 (0,0028-0.0087)
Camshaft alignment, mm (in) .............. 0.01 (0.0004)
Cam height (Intake/Exhaust), mm (in) .............. 26.88-26.83 (1.0583-1.0563)
Oil clearance of camshaft, mm (in) .............. 0.050-0.091 (0.0020-0.0036)
Camshaft journal O.D, mm (in) .............. 32.934-32.950 (1.2966-1.2972)
Camshaft bearing I.D, mm (in) -33.000-33.025 (1.2992-13002)

Piston pin Cylinder Bore, mm (in) .............. 20.000-20.013 (0.7874-0.7879)
Compression ring 2 groove clearance, mm (in) .............. 0.085-0.112 (0.0033-0.0044)
Piston ring groove width, mm (in) .............. 1.555-1.570 (0.0613-0.0618)
Compression ring 2 width, mm (in) .............. 1.458-1.470 (0.0574-0.0579)
Clearance between oil ring and ring groove, mm (in) .............. 0.020-0.055 (0.0008-0.0021)
Piston ring groove width, mm (in) .............. 4.010-4.030 (0.1579-0.1587)
Oil ring width, mm (in) .............. 3.975-3.990 (0.1565-0.1571)
Ring end gap (Compression ring 1), mm (in) .............. 0.25-0.40 (0.0098-0.0157)
Ring end gap (Compression ring 2), mm (in) .............. 0.25-0.40 (0.0098-0.0157)
Ring end gap (Oil ring), mm (in) .............. 0.25-0.40 (0.0098-0.0157)

Cylinder bore inside diameter, mm (in) .............. 72.000-72.019 (2.8347-2.8354)
Cylinder compression, psi (MPa) .............. 337-448 (2.32-3.09)
Cylinder head (max out of flatness), mm (in) .............. 0.05 (0.002)
Injection timing, deg (rad) .............. 25 (0.44) before T.D.C.
Injection pressure, MPa (psi) .............. 13.7 (1990)
Engine oil pressure at rated speed, kPa (psi) .............. 196-441 (29-64)
Intake valve clearance (Cold), mm (in) .............. 0.145-0.185 (0.0057-0.0072)
Exhaust valve clearance (Cold), mm (in) .............. 0.145-0.185 (0.0057-0.0072)
Engine oil type .............. SAE30, SAE 10W-30
Oil classification (API service) .............. CC or CD
Engine oil capacity, L (qts) .............. 2.6 (2.7)
Coolant capacity, L (qts) .............. 3.0 (3.2)
Oil filter part number .............. HH150-32094
Fuel filter part number .............. 1T021-43560
Air filter part number .............. 70000-11221

Check Fuel Pipes and Clamps .............. Every 50 hours
Change Engine Oil .............. Every 100 hours
Clean Air Filter .............. Every 100 hours
Clean Fuel Filter .............. Every 100 hours
Check Battery .............. Every 100 hours
Check Belt Tension .............. Every 100 hours
Replace Engine Oil Filter .............. Every 200 hours
Replace Fuel Filter .............. Every 200 hours
Clean Radiator Fins .............. Every 400 hours
Replace Air Filter .............. Every 600 hours
Check and Adjust Valve Clearance .............. Every 800 hours
Check Nozzle Injection Pressure .............. Every 1000 hours
Change Engine Coolant .............. Every 1000 hours

Head cover cap nuts (M7x1.0), Nm (ft-lb) .............. 6.9-8.8 (5.1-6.5)
Head screws and nuts (M9x1.25), Nm (ft-lb) .............. 64.7-69.6 (47.7-51.4)
Bearing case screws 1 (M7x1.0), Nm (ft-lb) .............. 26.5-30.4 (19.5-22.4)
Bearing case screws 2 (M8x1.25), Nm (ft-lb) .............. 29.4-34.3 (21.7-25.3)
Flywheel screws (M10x1.25), Nm (ft-lb) .............. 53.9-58.8 (39.8-43.4)
Connecting rod screws (M7x0.75), Nm (ft-lb) .............. 26.5-30.4 (19.5-22.4)
Rocker arm bracket nuts (M7x1.0), Nm (ft-lb) .............. 16.7-20.6 (12.3-5.2)
Idle gear shaft screws (M6x1.0), Nm (ft-lb) .............. 9.8-11.3 (7.2-8.3)
Glow plugs (M10x1.25), Nm (ft-lb) .............. 19.6-24.5 (14.5-18.1)
Drain plug (M12x1.25), Nm (ft-lb) .............. 39.2-49.0 (28.9-36.2)
Nozzle holder assembly (M24x2.0), Nm (ft-lb) .............. 29.4-49.0 (21.7-36.2)
Oil switch taper screw (PT-1/8), Nm (ft-lb) .............. 14.7-19.6 (10.8-14.5)
Fuel limit lock nut (M12x1.0), Nm (ft-lb) .............. 27.5-34.3 (20.3-25.3)
Fuel limit cap nut (M12x1.0), Nm (ft-lb) .............. 24.5-29.4 (18.1-21.7)
Injection pipe retaining nuts (M12x1.5), Nm (ft-lb) .............. 14.7-24.5 (10.8-8.1)
Nozzle holder and nozzle retaining nut, Nm (ft-lb) .............. 58.8-78.5 (43.4-57.9)
Nozzle holder mounting screw (M24x2.0), Nm (ft-lb) .............. 39.2-49.0 (28.9-36.2)
Crankshaft nut (M20x1.5), Nm (ft-lb) .............. 137.3-156.9 (101.3-115.7)

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Gasoline and Diesel Engines Technical Data