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Kubota Z430 Engine

Kubota Z430 Engine Specifications

Engine Model ................ Kubota Z430
Engine Type ................ Vertical, water-cooled, 4 cycle diesel
Number of Cylinders ................ 2
Displacement, cu in (L) ................ 25.9 (0.425)
Engine Bore, in (mm) ................ 2.60 (66.0)
Engine Stroke, in (mm) ................ 2.45 (62.2)
Aspiration ................ Naturally aspirated
Rated Engine Power, hp (kW) ................ 12.0 (8.8)
Rated Engine Speed, rpm ................ 3200
Firing Order ................ 1-2
Fuel System ................ Injection pump
Lubrication System ................ Forced lubrication by trochoid pump
Oil filter type ................ Full flow paper filter (cartridge)
Cooling System ................ Water with pressurized radiator
Pre-Heating ................ Glow plugs
Coolant Capacity, qts (L) ................ 2.0 (1.9)
Electrical System Rating, Volts ................ 12
Starting Motor ................ 12V, 0.7 kW
Battery Rating ................ 12V, 35 AH

Kubota Z430 Maintenance Data

Cylinder Block and Valves

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 and Filters

Engine oil type ................ SAE30, SAE 10W-30
API service classification ................ 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

Service Intervals

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

Kubota Z430 Service Data

Cylinder Block

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 Oil Clearance, in (mm) ................ 0.0013-0.0042 (0.034-0.106)
Crankpin to Crankpin Bearing Oil 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)

Valves

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

Kubota Z430 Torque Specifications

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

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