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| Home / Engines / Kubota Engines / Kubota D1803 |
Kubota D1803 Specifications
| Engine Model: Kubota D1803-M-DI |
| Engine Type: 4-cycle vertical 3-cylinder water-cooled diesel engine |
| Total Displacement: 111.4 cu.in (1.8 L) |
| Rated Engine Power: 36.1 Hp (26.9 kW) at 2800 rpm |
| Fuel System: Direct fuel injection |
| General Technical Data |
Engine model ............... Kubota D1803
Engine type ............... 4-stroke vertical water-cooled diesel
Number of cylinders ............... 3
Total displacement, L (cu.in) ............... 1.83 (111.4)
Cylinder bore, mm (in) ............... 87.0 (3.43)
Piston stroke, mm (in) ............... 102.4 (4.04)
Gross power, kW (Hp) ............... 26.9 (36.1)
Net power, kW (Hp) ............... 23.3 (31.2)
Maximum speed, rpm ............... 2800
Idle speed, rpm ............... 750-850
Aspiration type ............... Naturally aspirated
Firing order ............... 1-2-3
Compression ratio ............... 23.8:1
Combustion chamber ............... Spherical type
Direction of rotation ............... Counter-clockwise
Lubrication system ............... Forced lubrication by trochoid pump
Oil filter type ............... Full flow paper filter (cartridge)
Cooling system ............... Pressurized radiator, forced circulation with water pump
Engine oil capacity, L (qts) ............... 5.6 (5.9)
Starting system ............... Electric starting with starter
Electrical system rating, Volts ............... 12
| Fuel System |
Injection pump ............... Bosch type mini pump
Injection nozzle ............... Bosch throttle type
Injection pressure, kPa (psi) ............... 13730 (1990)
Injection timing, deg (rad) ............... 18 (0.314) before TDC
Governor type ............... Centrifugal, mechanical
| Dimensions and Weight |
Overall Length, mm (in) ............... 575.9 (22.7)
Overall Width, mm (in) ............... 499.0 (19.8)
Overall Height, mm (in) ............... 685.0 (27.0)
Dry Weight, kg (lbs) ............... 151 (332)
| Cylinder Block |
Cylinder Bore I.D (Std) ............... 87.000-87.022 mm (3.42519-3.42606 in)
Cylinder Bore I.D (Wear Limit) ............... 87.172 mm (3.43196 in)
Cylinder Bore I.D (Oversize) ............... 87.250-87.272 mm (3.4351-3.4359 in)
Connecting Rod Alignment ............... 0.05 mm (0.0020 in)
Connecting Rod Small End Bushing I.D ............... 22.025-22.040 mm (0.8671-0.8677 in)
Crankshaft Alignment – 0.02 mm (0.00079 in)
Crankshaft Side Clearance (Std) ............... 0.15-0.31 mm (0.0059-0.0122 in)
Crankshaft Side Clearance (Wear Limit) ............... 0.50 mm (0.0197 in)
Crankshaft Journal O.D ............... 59.921-59.940 mm (2.35910-2.35984 in)
Crankshaft Bearing 1 I.D ............... 59.980-60.039 mm (2.36142-2.36374 in)
Crankshaft Bearing 2 I.D ............... 59.980-60.025 mm (2.36142-2.36319 in)
Crankshaft Journal to Bearing 1 Clearance ............... 0.040-0.118 mm (0.00157-0.00465 in)
Crankshaft Journal to Bearing 2 Clearance ............... 0.040-0.104 mm (0.00157-0.00409 in)
Crankpin to Crankpin Bearing Oil Clearance ............... 0.025-0.087 mm (0.00098-0.00343 in)
Crankpin O.D ............... 46.959-46.975 mm (1.84878-1.84941 in)
Crankpin Bearing I.D ............... 47.000-47.046 mm (1.85039-1.85221 in)
| Cylinder Head and Valves |
Cylinder Head Surface Flatness ............... 0.05 mm / 500 mm (0.002 in / 19.7 in)
Valve Clearance (Cold) ............... 0.18-0.22 mm (0.0071-0.0086 in)
Top Clearance ............... 0.55-0.70 mm (0.0217-0.0276 in)
Valve Stem to Valve Guide Clearance ............... 0.040-0.070 mm (0.0016-0.0027 in)
Valve Stem O.D ............... 7.960-7.975 mm (0.31339-0.31398 in)
Valve Guide I.D ............... 8.015-8.030 mm (0.31555-0.31614 in)
Valve Seat Width (Intake) ............... 2.12 mm (0.0835 in)
Valve Seat Width (Exhaust) ............... 2.12 mm (0.0835 in)
Valve Seat Angle (Intake) ............... 1.05 rad (60 deg)
Valve Seat Angle (Exhaust) ............... 0.79 rad (45 deg)
Valve Spring Free Length ............... 41.7-42.2 mm (1.6417-1.6614 in)
Valve Opening (Intake) ............... 12 deg (0.21 rad) before T.D.C.
Valve Closing (Intake) ............... 36 deg (0.63 rad) after B.D.C.
Valve Opening (Exhaust) ............... 57 deg (1.0 rad) before B.D.C.
Valve Closing (Exhaust) ............... 12 deg (0.21 rad) after T.D.C.
Rocker Arm Shaft to Rocker Arm Clearance ............... 0.016-0.045 mm (0.0006-0.0018 in)
Rocker Arm Shaft O.D ............... 13.973-13.984 mm (0.55012-0.55055 in)
Rocker Arm I.D ............... 14.000-14.018 mm (0.55118-0.55189 in)
Camshaft Side Clearance ............... 0.07-0.22 mm (0.0028-0.0087 in)
Camshaft Alignment ............... 0.01 mm (0.0004 in)
Camshaft Journal O.D ............... 39.934-39.950 mm (1.57221-1.57284 in)
Camshaft Journal to Cylinder Bore Clearance ............... 0.050-0.091 mm (0.00197-0.00358 in)
Cam Height (Intake) ............... 33.85-33.90 mm (1.3327-1.3346 in)
Cam Height (Exhaust) ............... 33.85-33.90 mm (1.3327-1.3346 in)
| Piston and Piston Rings |
Piston Pin Bore I.D (Std) ............... 25.000-25.013 mm (0.98425-0.98476 in)
Piston Pin Bore I.D (Wear Limit) ............... 25.05 mm (0.9862 in)
Piston Pin O.D ............... 25.002-25.011 mm (0.98433-0.98469 in)
Piston Pin to Small End Bushing Clearance ............... 0.014-0.038 mm (0.00056-0.00150 in)
Second Ring Groove Clearance (Std) ............... 0.093-0.128 mm (0.0037-0.0050 in)
Second Ring Groove Clearance (Wear Limit) ............... 0.20 mm (0.0079 in)
Oil Ring Groove Clearance (Std) ............... 0.020-0.060 mm (0.0008-0.0024 in)
Oil Ring Groove Clearance (Wear Limit) ............... 0.15 mm (0.0059 in)
Top Ring End Gap (Std) ............... 0.20-0.40 mm (0.0079-0.0157 in)
Second Ring End Gap (Std) ............... 0.30-0.45 mm (0.0118-0.0177 in)
Oil Ring End Gap (Std) ............... 0.25-0.45 mm (0.0098-0.0177 in)
Ring End Gap (Wear Limit) ............... 1.25 mm (0.0492 in)
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| Engines Technical Specifications |