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Kubota Z430 Specifications

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• Kubota Z430 Engine Specifications
• Kubota Z430 Engine Troubleshooting

Engine Model ............... Kubota Z430
Engine Type ............... 4-stroke two-cylinder liquid-cooled diesel
Number of Cylinders ............... 2
Displacement, cu.in (L) ............... 25.9 (0.425)
Cylinder Bore, in (mm) ............... 2.60 (66.0)
Piston Stroke, in (mm) ............... 2.45 (62.2)
Aspiration Type ............... Naturally aspirated
Rated Engine Power, hp (kW) ............... 12.0 (8.8)
Rated Engine Speed, rpm ............... 3200
Firing Order ............... 1-2
Fuel System .............. Fuel injection
Governor Type .............. Mechanical
Lubrication System ............... Forced lubrication by trochoid pump
Oil filter type ............... Full flow paper filter (cartridge)
Cooling System ............... Water with pressurized radiator
Coolant Capacity, qts (L) ............... 2.0 (1.9)
Pre-Heating ............... Glow plugs
Starting System .............. Electric starting with starter
Electrical System Rating, Volts ............... 12

Cylinder Liner Inside Diameter (Minimum), in (mm) ............... 2.5984 (65.960)
Cylinder Liner Inside Diameter (Maximum), in (mm) ............... 2.6044 (66.130)
Piston Outside Diameter, in (mm) ............... 2.5957 (65.906)
Piston Ring End Gap, in (mm) ............... 0.017-0.035 (0.431-0.886)
Crankshaft End Play, in (mm) ............... 0.012 (0.304)
Crankshaft Journal Outside Diameter, in (mm) ............... 1.5722-1.5728 (39.934-39.950)
Crankshaft Bearing Inside Diameter, in (mm) ............... 1.5715-1.5764 (39.984-40.040)
Crankshaft Journal to Bearing Clearance, in (mm) ............... 0.0013-0.0042 (0.034-0.106)
Crankpin to Crankpin Bearing Clearance, in (mm) ............... 0.0008-0.0020 (0.020-0.051)
Crankpin Outside Diameter, in (mm) ............... 1.3370-1.3376 (33.959-33.975)
Crankpin Bearing Inside Diameter, in (mm) ............... 1.3389-1.3390 (33.995-34.010)

Intake Valve Clearance (Cold), in (mm) ............... 0.0057-0.0073 (0.145-0.185)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.0057-0.0073 (0.145-0.185)
Exhaust Valve Head Diameter, in (mm) ............... 0.89 (22.50)
Intake Valve Head Diameter, in (mm) ............... 1.03 (26.00)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.2354 (5.980)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.2354 (5.980)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.2372 (6.030)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.2372 (6.030)
Exhaust Valve Seat Angle, deg ............... 45
Intake Valve Seat Angle, deg ............... 45

Cylinder bore inside diameter (maximum), in (mm) ............... 2.6044 (66.130)
Cylinder compression, psi (MPa) ............... 325-450 (2.24-3.10)
Cylinder head (max. out of flatness), in (mm) ............... 0.002 (0.05)
Intake valve clearance (Cold), in (mm) ............... 0.007 (0.18)
Exhaust valve clearance (Cold), in (mm) ............... 0.007 (0.18)
Engine oil type ............... SAE30, SAE 10W-30
Oil classification (API service) ............... CC or CD
Engine oil capacity, qts (L) ............... 2.1 (2.0)
Oil filter part number ............... HH152-32432
Fuel filter part number ............... 1T021-43560
Air filter part number ............... 12581-43012/1T021-43560

Change Engine Oil ............... Every 75 hours
Service Air Filter ............... Every 100 hours
Clean Fuel Filter ............... Every 100 hours
Change Engine Oil Filter ............... Every 150 hours
Replace Air Filter ............... Every 200 hours
Check and Adjust Valve Clearance ............... Every 300 hours
Replace Fuel Pre-Filter ............... Every 500 hours

Cylinder Head Bolt (M8x1.25), Nm (ft-lb) ............... 42 (32)
Main Bearing Case Bolt 2 (M7x1.0), Nm (ft-lb) ............... 26-30 (19-22)
Main Bearing Case Bolt 1 (M6x1.0), Nm (ft-lb) ............... 12.5-15.5 (9.5-11.5)
Connecting Rod Bolt (M7x1.0), Nm (ft-lb) ............... 26 (19)
Flywheel Bolt (M10x1.25), Nm (ft-lb) ............... 59 (44)
Rocker Arm Bracket Bolt (M6x1.0), Nm (ft-lb) ............... 11.5 (8.3)
Fan Drive Pulley Bolt (M12x1.5), Nm (ft-lb) ............... 117 (86)
Oil Pump Mounting Bolt (M8x1.25), Nm (ft-lb) ............... 20 (15)

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Gasoline and Diesel Engines Technical Data