The Kubota Z851 is a 867 cc (52.9 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota Corporation for general-purpose applications.
The cylinder bore and piston stroke are 76.0 mm (2.99 in) and 82.0 mm (3.23 in), respectively.
This engine produced 18.2 PS (13.4 kW; 18.0 HP) at 3,000 rpm of horsepower.
The Kubota Z851 features:
Fuel injection pump
Centrifugal ball mechanical governor
Forced lubrication by pump
Liquid cooling system
Electric starter
Charging alternator
General information
Engine Specifications
Engine model
Z851
Engine type
4-stroke, vertical, two-cylinders
Displacement
867 cm3, (52.9 cu·in)
Max. horsepower
18.2 PS (13.4 kW; 18.0 HP) at 3,000 rpm
Max. torque
–
Cooling system
Liquid-cooled
Lubricating system
Forced lubrication by pump
Combustion chamber
–
Fuel system
Fuel injection pump
Injection type
Indirect injection
Fuel used
Diesel fuel No.2-D
Starting system
Electric starter
Governor
Centrifugal ball mechanical governor
PTO shaft rotation
Counterclockwise (from PTO shaft side)
Dimensions (L x W X H)
–
Dry weight
–
Cylinder Block and Head
Cylinder block
Compression ratio:
–
Cylinder bore:
82.0 mm (3.23 in)
Piston stroke:
82.0 mm (3.23 in)
Cylinder internal diameter (standard):
82.000-82.022 mm (3.2283-3.2292 in)
Piston skirt diameter (standard):
–
Number of piston rings (compression / oil):
2/1
Piston pin diameter:
23.002-23.011 mm (0.9056-0.9059 in)
Side clearance (Second):
0.090-0.120 mm (0.0040-0.0050 in)
Side clearance (Oil):
0.020-0.050 mm (0.0008-0.0020 in)
Ring end gap (Top):
0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Second):
0.300-0.450 mm (0.0118-0.0177 in)
Ring end gap (Oil):
0.250-0.400 mm (0.0098-0.0157 in)
Number of main bearings:
3
Crankshaft main journal diameter:
51.921-51.940 mm (2.0441-2.0449 in)
Crankpin journal diameter:
43.959-43.975 mm (1.7307-1.7313 in)
Cylinder head
Valves:
2, (4 valves in total)
Valve seat width (INTAKE):
2.100 mm (0.080 in)
Valve seat width (EXHAUST):
2.100 mm (0.080 in)
Value seat angle (INTAKE):
45°
Value seat angle (EXHAUST):
45°
Valveface angle (INTAKE):
45°
Valveface angle (EXHAUST):
45°
Valve steam diameter (INTAKE):
7.960-7.975 mm (0.3134-0.3140 in)
Valve steam diameter (EXHAUST):
7.960-7.975 mm (0.3134-0.3140 in)
Valve spring free length (INTAKE):
42.0 mm (1.6535 in)
Valve spring free length (EXHAUST):
42.0 mm (1.6535 in)
Camshaft journal diameter :
39.935-39.950 mm (1.5722-1.5728 in)
Tightening torque
Tightening torque specs
Cylinder head screw:
75.0-78.0 Nm (7.65-7.80 kgf·m, 55.3-58.0 lb·ft)
Connecting rod screw:
37.0-41.0 Nm (3.8-4.2 kgf·m; 27.3-30.3 lb·ft)
Flywheel screw:
54.0-58.0 Nm (5.5-5.9 kgf·m; 39.9-42.8 lb·ft)
Idle gear shaft screws:
32.4-37.3 Nm (3.3-3.8 kgf·m; 23.9-27.5 lb·ft)
Bearing case cover mounting screw:
30.0-34.0 Nm (3.0-3.4 kgf·m; 22.0-25.0 lb·ft)
Service Data
Engine
Maximum speed:
2,950 rpm
Idle speed:
600-650 rpm
Valve clearance
Intake valve clearance:
0.18-0.22 mm (0.0071-0.0087 in)
Exhaust valve clearance:
0.18-0.22 mm (0.0071-0.0087 in)
Oil system
Lubrication system:
Forced lubrication
Oil type:
DS or DM
Recommended oil:
SAE 80
Oil capacity:
3.8 liters (4.02 US.qts, 3.34 Imp. qts)
Fuel system
Injection timing:
25° B.T.D.C.
Fuel injection pressure
13.73-14.71 MPa (140-150 kgf/cm2, 1991-2133 psi)
Cooling system
Type:
Pressurized radiator, forced circulation with water pump
Author:Sergei WersAbout: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.
The Kubota Z851 is a 867 cc (52.9 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion vertical diesel engine, manufactured by Kubota Corporation for general-purpose applications.
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