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| Home / Industrial Engines / Kubota Engines / Kubota D850 |
Kubota D850 Maintenance
| Engine Model: Kubota D850 |
| Engine Type: 4-cycle 3-cylinder liquid-cooled diesel engine |
| Total Displacement: 52.2 cu.in (0.85 L) |
| Rated Engine Power: 19.8 Hp (14.9 kW) at 3200 rpm |
| Aspiration Type: Naturally aspirated |
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| Service Data |
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)
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 .............. SAE30, SAE 10W-30
Oil classification (API service) .............. CC or CD
Engine oil capacity, L (qts) .............. 3.1 (3.3)
Coolant capacity, L (qts) .............. 2.9 (3.1)
| Engine Filters |
Oil filter part number .............. HH150-32094
Fuel filter part number .............. 1T021-43560
Air filter part number .............. 15852-11082
| Service Intervals |
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
| Tightening Torque Specs |
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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