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| Home / Industrial Engines / Kubota Engines / Kubota D722 |
Kubota D722 Maintenance
| Engine Model: Kubota D722 |
| Engine Type: 4-cycle 3-cylinder liquid-cooled diesel engine |
| Total Displacement: 43.9 cu.in (0.72 L) |
| Rated Engine Power: 20.0 Hp (14.9 kW) at 3800 rpm |
| Aspiration Type: Naturally aspirated |
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| Service Data |
Cylinder bore inside diameter, mm (in) .............. 67.000-67.019 (2.6378-2.6385)
Cylinder compression, psi (MPa) .............. 413-469 (2.85-3.23)
Cylinder head (max out of flatness), mm (in) .............. 0.05 (0.002)
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 and Coolant |
Engine oil type .............. SAE 10W-30, 15W-40
Oil classification (API service) .............. CF, CF-4, or CG-4
Engine oil capacity, L (qts) .............. 3.0 (3.2)
Coolant capacity, L (qts) .............. 3.3 (3.5)
| Engine Filters |
Oil filter part number .............. HH150-32430
Fuel filter part number .............. 12581-43012
Air filter part number .............. 15852-11082
| Service Intervals |
Check Fuel Hoses 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 Drive Belt Tension .............. Every 100 hours
Replace Engine Oil Filter .............. Every 200 hours
Check Intake Air Line .............. Every 200 hours
Replace Fuel Filter .............. Every 400 hours
Clean Radiator Fins .............. Every 600 hours
Replace Drive Belt .............. Every 600 hours
Replace Air Filter .............. Every 600 hours
Check and Adjust Valve Clearance .............. Every 800 hours
Check Injection Nozzle .............. Every 1500 hours
Check Injection Timing .............. Every 1500 hours
Check Fuel Injection Pump .............. Every 1500 hours
Change Engine Coolant .............. Every 2000 hours
| Tightening Torque Specs |
Cylinder head cover screw (M6x1), Nm (lb-ft) .............. 9.81-11.2 (7.24-8.31)
Cylinder head screw (M8 x1.25), Nm (lb-ft) .............. 38-42 (28-31)
Flywheel screw (M10x1.25), Nm (lb-ft) .............. 54-58 (40-43)
Injection pipe retaining nut (M12x1.5), Nm (lb-ft) .............. 25-34 (18-25)
Overflow pipe retaining nut (M12x1.5), Nm (lb-ft) .............. 20-24 (15-18)
Nozzle holder assembly (M20x1.5), Nm (lb-ft) .............. 49-68 (37-50)
Oil pressure switch (PT1/8), Nm (lb-ft) .............. 15-19 (11-14)
Glow plug (M8x1), Nm (lb-ft) .............. 7.9-14 (5.8-10)
Rocker arm bracket nut (M6x1), Nm (lb-ft) .............. 9.81-11.2 (7.24-8.31)
Fan drive pulley screw (M12x1.5), Nm (lb-ft) .............. 117.7-127.5 (86.8-94)
Idle gear shaft mounting screw M6x1), Nm (lb-ft) .............. 9.8-11.3 (7.2-8.3)
Oil pump mounting screw M8x1.25), Nm (lb-ft) .............. 17.7-21.6 (13-15.9)
Connecting rod screw M7x0.75), Nm (lb-ft) .............. 26.5-30.4 (19.5-22.4)
Bearing case cover mounting screw M6x1), Nm (lb-ft) .............. 9.8-11.3 (7.2-8.3)
Alternator’s pulley nut, Nm (lb-ft) .............. 58.3-78.9 (43-58.2)
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| Engines Technical Specifications |