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Kubota S2800 Engine

Kubota S2800 Engine Technical Data

General Specifications

Engine model ..................... Kubota S2800
Engine type ..................... 4-cycle vertical water-cooled diesel
Number of cylinders ..................... 6
Total displacement, L (cu.in) ..................... 2.8 (170.3)
Cylinder bore, mm (in) ..................... 85.0 (3.35)
Piston stroke, mm (in) ..................... 82.0 (3.23)
Maximum power, kW (Hp) ..................... 43.7 (59.0)
Maximum speed, rpm ..................... 2800
Idle speed, rpm ..................... 750-800
Aspiration type ..................... Naturally aspirated
Firing order ..................... 1-5-3-6-2-4
Compression ratio ..................... 21:1
Combustion chamber ..................... Spherical type
Direction of rotation ..................... Counter-clockwise
Lubrication system ..................... Forced lubrication by rotor type
Oil filter type ..................... Full flow paper filter (cartridge)
Cooling system ..................... Pressurized radiator, forced circulation with water pump
Engine oil capacity, L (qts) ..................... 12.7 (13.5)
Starting system ..................... Electric starting with starter
Electrical system rating, Volts ..................... 12

Fuel System

Injection pump ..................... Bosch K type mini
Injection nozzle ..................... Bosch throttle type
Injection pressure, kPa (psi) ..................... 13730 (1990)
Injection timing, deg (rad) ..................... 25 (0.436) before T.D.C.
Governor type ..................... Centrifugal, mechanical

Dimensions and Weight

Overall Length, mm (in) ..................... 880 (34.6)
Overall Width, mm (in) ..................... 530 (20.9)
Overall Height, mm (in) ..................... 648 (25.5)
Dry Weight, kg (lbs) ..................... 235.5 (519)

Kubota S2800 Maintenance Data

Engine Oil

Engine oil type ..................... SAE 10W, 30W, SAE 10W-30
Oil classification (API service) ..................... CD or higher
Engine oil capacity, L (qts) ..................... 12.7 (13.5)

Engine Filters

Oil filter part number ..................... 15402-32430
Fuel filter part number ..................... 15601-43170
Air filter part number ..................... 15621-11210, 15621-11180

Service Intervals

Check Battery ..................... Every 150 hours
Check Fuel Pipes ..................... Every 150 hours
Check Belt Tension ..................... Every 150 hours
Clean Fuel Pump ..................... Every 200 hours
Service Air Filter ..................... Every 200 hours
Change Engine Oil ..................... Every 200 hours
Replace Oil Filter ..................... Every 200 hours
Replace Fuel Filter ..................... Every 400 hours
Clean Radiator Fins ..................... Every 400 hours
Replace Fan Belt ..................... Every 600 hours
Check Valve Clearance ..................... Every 800 hours
Replace Air Filter ..................... Every 800 hours
Check Injection Nozzles ..................... Every 1000 hours
Change Engine Coolant ..................... Every 1000 hours

Kubota S2800 Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard) ..................... 85.000-85.022 mm (3.34646-3.34732 in)
Cylinder Bore I.D (Wear Limit) ..................... 85.17 mm (3.3532 in)
Cylinder Bore Oversize I.D (Standard) ..................... 85.500-85.522 mm (3.36614-3.36701 in)
Cylinder Bore Oversize I.D (Wear Limit) ..................... 85.67 mm (3.3728 in)
Crankshaft Side Clearance ..................... 0.15-0.31 mm (0.0059-0.0122 in)
Crankshaft Alignment ..................... 0.08 mm (0.0031 in)
Crank Pin to Crank Pin Bearing Clearance ..................... 0.035-0.093 mm (0.00138-0.00366 in)
Crank Pin O.D ..................... 43.959-43.975 mm (1.73067-1.73130 in)
Crank Pin Bearing I.D ..................... 44.010-44.052 mm (1.73268-1.73433 in)
Crankshaft Journal to Bearing 1 Clearance ..................... 0.040-0.118 mm (0.00157-0.00465 in)
Crankshaft Bearing 1 I.D ..................... 51.980-52.039 mm (2.04646-2.04878 in)
Crankshaft Journal O.D ..................... 51.921-51.940 mm (2.04414-2.04488 in)
Crankshaft Journal to Bearing 2 Clearance ..................... 0.040-0.104 mm (0.00157-0.00409 in)
Crankshaft Bearing 2 I.D ..................... 51.980-52.025 mm (2.04646-2.04823 in)
Connecting Rod Alignment ..................... 0.05 mm (0.002 in)
Connecting Rod Small End Bushing I.D ..................... 23.025-23.040 mm (0.90650-0.90709 in)
Connecting Rod End Play ..................... 0.4-0.6 mm (0.016-0.024 in)

Cylinder Head and Valves

Cylinder Head Surface Flatness ..................... 0.05 mm (0.002 in)
Valve Clearance (Cold) ..................... 0.18-0.22 mm (0.0071-0.0087 in)
Top Clearance ..................... 0.7-0.9 mm (0.0276-0.0345 in)
Valve Recessing ..................... 1.1-1.3 mm (0.043-0.051 in)
Valve Stem to Valve Guide Clearance ..................... 0.04-0.07 mm (0.0016-0.0028 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 Face Angle ..................... 0.794 rad. (45.5 deg)
Valve Seat Angle ..................... 0.785 rad. (45 deg)
Intake Valve Seat Width ..................... 2.12 mm (0.0835 in)
Exhaust Valve Seat Width ..................... 2.12 mm (0.0835 in)
Intake Valve Timing (Open) ..................... 0.35 rad (20 deg) before T.D.C.
Intake Valve Timing (Close) ..................... 0.79 rad (45 deg) after B.D.C.
Exhaust Valve Timing (Open) ..................... 0.87 rad (50 deg) before B.D.C.
Exhaust Valve Timing (Close) ..................... 0.26 rad (15 deg) after T.D.C.
Valve Spring Free Length (Standard) ..................... 41.7-42.2 mm (1.6417-1.6614 in)
Valve Spring Free Length (Wear Limit) ..................... 41.2 mm (1.622 in)
Rocker Arm Shaft to Bushing Clearance ..................... 0.018-0.070 mm (0.00071-0.00276 in)
Rocker Arm Shaft O.D ..................... 13.973-13.984 mm (0.55012-0.55055 in)
Rocker Arm Bushing I.D ..................... 14.002-14.043 mm (0.55126-0.55287 in)
Camshaft Side Clearance ..................... 0.07-0.22 mm (0.0028-0.0087 in)
Camshaf Alignment ..................... 0.08 mm (0.0031 in)
Camshaft Oil Clearance ..................... 0.050-0.091 mm (0.0020-0.0035 in)
Camshaft Journal O.D ..................... 39.934-39.950 mm (1.57221-1.57284 in)
Camshaft Bearing I.D ..................... 40.000-40.025 mm (1.57480-1.57579 in)
Cam Height (Intake) ..................... 33.31-33.36 mm (1.3114-1.3134 in)
Cam Height (Exhaust) ..................... 33.31-33.36 mm (1.3114-1.3134 in)

Piston and Piston Rings

Piston O.D ..................... 84.915-84.935 mm (3.34311-3.34390 in)
Piston Pin Bore I.D (Standard) ..................... 23.000-23.013 mm (0.90551-0.90602 in)
Piston Pin Bore I.D (Wear Limit) ..................... 23.05 mm (0.9075 in)
Piston Pin to Small End Bushing Clearance ..................... 0.014-0.038 mm (0.00055-0.00150 in)
Piston Pin O.D ..................... 23.002-23.011 mm (0.90559-0.90595 in)
Top Ring Gap ..................... 0.30-0.45 mm (0.0118-0.0177 in)
Second Ring Gap ..................... 0.30-0.45 mm (0.012-0.017 in)
Oil Ring Gap ..................... 0.25-0.45 mm (0.0099-0.017 in)
Second Ring Width ..................... 1.950-1.962 mm (0.07677-0.07724 in)
Second Ring Groove Clearance ..................... 0.093-0.120 mm (0.00366-0.00472 in)
Oil Ring Width ..................... 4.978-4.990 mm (0.19598-0.19646 in)
Oil Ring Groove Clearance ..................... 0.020-0.052 mm (0.00079-0.00205 in)

Tightening Torque Specs

Cylinder head screws (M10x1.25), Nm (lb-ft) ..................... 88.3-92.2 (65.1-68.0)
Cylinder head studs (M10x1.25), Nm (lb-ft) ..................... 34.3-39.2 (25.3-28.9)
Crankshaft end screw (M16x1.5), Nm (lb-ft) ..................... 196.1-215.7 (144.7-159.1)
Bearing case screws 1 (M8x1.25), Nm (lb-ft) ..................... 29.4-34.3 (21.7-25.3)
Bearing case screws 2 (M10x1.25), Nm (lb-ft) ..................... 63.7-68.6 (47.0-50.6)
Flywheel screws (M12x1.25), Nm (lb-ft) ..................... 98.1-107.9 (72.3-79.6)
Connecting rod screws (M8x1.0), Nm (lb-ft) ..................... 36.3-41.2 (26.8-30.4)
Rocker arm bracket studs (M8x1.25), Nm (lb-ft) ..................... 23.5-27.5 (17.4-20.3)
Drain plug (M12x1.25), Nm (lb-ft) ..................... 44.1-49.0 (32.5-36.2)
Glow plugs (M10x1.25), Nm (lb-ft) ..................... 19.6-24.5 (14.5-18.1)
Nozzle holder body. Nm (lb-ft) ..................... 29.4-49.0 (21.7-36.2)
Nozzle retaining nut. Nm (lb-ft) ..................... 78.5-98.1 (57.9-72.3)
Delivery valve holder. Nm (lb-ft) ..................... 39.2-49.0 (28.9-36.2)

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