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Kubota Z750 Specifications

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• Kubota Z750 Engine Specifications
• Kubota Z750 Engine Troubleshooting

Engine Model ............... Kubota Z750A
Engine Type ............... 4-cycle two-cylinder liquid-cooled diesel
Number of Cylinders ............... Two
Cylinder Bore, mm (in) ............... 76.0 (3.02)
Piston Stroke, mm (in) ............... 82.0 (3.25)
Displacement, L (cu.in) ............... 0.743 (45.3)
Gross Power, kw (hp) ............... 12.7 (17.0)
Rated Speed, rpm ............... 2800
Slow Idle Speed, rpm ............... 600-650
High Idle Speed, rpm ............... 2950
Compression Ratio ............... 21:1
Firing Order ............... 1-2
Cooling System ............... Liquid-cooled
Starting System .............. Electric starting with starter
Electrical System Rating, Volts ............... 12

Fuel System .............. Fuel injection
Governor Type .............. Mechanical
Timing Mark Location ............... Flywheel

Overall Length, mm (in) ............... 393.0 (15.6)
Overall Width, mm (in) ............... 435.0 (17.3)
Overall Height, mm (in) ............... 540.0 (21.5)
Dry weight, kg (lbs.) ............... 71.0 (156)

Cylinder Sleeve Diameter, mm (in) ............... 79.0-79.03 (2.992-2.993)
Crankshaft Main Journal Diameter, mm (in) ............... 51.99-52.01 (2.0469-2.0476)
Crankshaft Main Journal Bearing Clearance, mm (in) ............... 0.04-0.10 (0.0015-0.004)
Crankshaft Crankpin Journal Diameter, mm (in) ............... 43.88-43.90 (1.7284-1.729)
Crankshaft Crankpin Journal Bearing Clearance, mm (in) ............... 0.025-0.1 (0.001-0.004)
Crankshaft Crankpin Journal Side Clearance, mm (in) ............... 0,4-0.6 (0.016-0.024)
Crankshaft End Play, mm (in) ............... 0.15-0.3 (0,006-0,012)
Backlash Between Crankshaft Gear and Camshaft Gear, mm (in) ............... 0.07-0.15 (0.003-0.006)
Backlash Between Two Gears In Timing Gear, mm (in) ............... 0.04-0.12 (0.0015-0.0045)
Piston Pin Diameter, mm (in) ............... 23.1 (0.911)
Piston Pin Clearance, mm (in) ............... 0.014-0.04 (0.0005-0.0015)
Piston Skirt-Cylinder Clearance, mm (in) ............... 0.08-0.016 (0,003-0.006)
Idle Gear Side Clearance, mm (in) ............... 0.20-0.50 (0.008-0.020)
Idle Gear Shaft-Idle Gear Bushing, Clearance, mm (in) ............... 0.020-0.05 (0.001-0.002)
Piston Ring End Gap (Compression Ring), mm (in) ............... 0.3-0.45 (0.012-0.018)
Piston Ring End Gap (Control Ring), mm (in) ............... 0.25-0.4 (0.010-0.016)
Second Compression Ring Side Clearance, mm (in) ............... 0.065-0.09 (0.0025-0.0035)
Oil Control Ring Side Clearance, mm (in) ............... 0.02-0.06 (0.0008-0.0024).

Valve Tappet Clearance (Cold), mm (in) ............... 0.18 0.22 (0.007-0.009)
Valve Stem Diameter (Intake), mm (in) ............... 7.95-7.975 (0.313-0.314)
Valve Stem Diameter (Exhaust), mm (in) ............... 7.95-7.975 (0.313-0.314)
Valve Face Angle, degrees ............... 45
Valve Seat Angle, degrees ............... 45
Valve Seat Width, mm (in) ............... 1.5 (0.060)
Valve Springs Free Length, mm (in) ............... 42.0 (1.667)
Rocker Arm Shaft-Rocker Arm Clearance, mm (in) ............... 0.02-0.08 (0.0008-0.003)
Camshaft Journal Diameter, mm (in) ............... 39.935-39.95 (1.572-1.573)
Camshaft Journal Bearing Clearance, mm (in) ............... 0.05-0.1 (0.002-0.004)
Camshaft End Play, mm (in) ............... 0.07-0.21 (0.003-0.009)
Cam Height (Intake), mm (in) ............... 36.87 (1.4516)
Cam Height (Exhaust), mm (in) ............... 36.87 (1.4516)

Injection timing (BTDC), deg ............... 25
Injection pressure, MPa (psi) ............... 13.8 (2000)
Fuel type ............... Diesel fuel No. 2-D
Engine oil type ............... SAE 80
Lubricant type ............... DS or DM
Engine oil capacity, L (qts) ............... 3.5 (3.7)
Coolant capacity, L (qts) ............... 5.32 (5.55)
Oil filter change interval ............... Every 200 hours
Oil change interval ............... Every 200 hours
Fuel filter change interval ............... Every 400 hours

Cylinder head cover screw, Nm (ft-lb) ............... 75-82 (55-60)
Connecting rod screw, Nm (ft-lb) ............... 37-41 (27-30)
Flywheel screw, Nm (ft-lb) ............... 54-58 (40-43)
Idle gear shaft screws, Nm (ft-lb) ............... 32.4-37.3 (23.9-27.5)
Bearing case cover mounting screw, Nm (ft-lb) ............... 49.0-68.6 (36.2-50.6)

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Gasoline and Diesel Engines Technical Data