The Kohler K321 is a 512 cc, (31.2 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by Kohler Co, for general-purpose applications.
Cylinder bore and piston stroke are 88.9 mm (3.5 in) and 82.6 mm (3.25 in), respectively. This engine produced 14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm of horsepower.
The Kohler K321 features:
- L-head (side valve) design
- Magneto ignition system, battery ignition system, breakerless ignition system ignition system*
- Carburetor (Kohler or Walbro – fixed main jet or adjustable main jet)*
- Centrifugal governor
- Splash type lubrication system
- Forced air cooling system
- Retractable and electric starter
* – depending on modification
General information
Engine Specifications | |
Engine model | K321 |
Engine type | 4-stroke, L-head (side valve), single-cylinder |
Displacement | 512 cm3, (31.24 cu·in) |
Max. horsepower | 14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm |
Max. torque | – |
Cooling system | Forced air |
Air cleaner | Paper air cleaner (oiled foam precleaner) |
Lubricating system | Splash type |
Ignition system | Magneto ignition system, battery ignition system, breakerless ignition system |
Fuel system | Carburetor (Kohler or Walbro – fixed main jet or adjustable main jet) |
Fuel consumption | – |
Fuel tank capacity | – |
Fuel used | Unleaded gasoline (octane number 86 or higher) |
Starting system | Retractable or electric starter |
Governor | Centrifugal governor |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions (L x W X H) | – |
Dry weight | 53.5 kg (117.9 lbs) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | – |
Cylinder bore: | 88.9 mm (3.5 in) |
Piston stroke: | 82.6 mm (3.25 in) |
Cylinder internal diameter (standard): | 88.9127-88.8873 mm (3.5005-3.4995 in) |
Piston skirt outer diameter (standard): | 88.7501-88.7425 mm (3.4941-3.4938 in) |
Number of piston rings (compression / oil): | 2/1 |
Connecting rod small end diameter (standard): | 22.2428-22.2504 mm (0.8757-0.876 in) |
Piston pin diameter: | 22.2300-22.2352 mm (0.8752-0.8754 in) |
Ring end gap (Top): | 0.177-0.432 mm (0.007-0.017 in) |
Ring end gap (Second): | 0.177-0.432 mm (0.007-0.017 in) |
Crankshaft center distance: | 41.3 mm (1.625 in) |
Cylinder head | |
Valve arrangement: | L-head (side valve), belt driven |
Valves: | 2 |
Valve head diameter (INTAKE): | 34.798-35.052 mm (1.37-1.38 in) |
Valve head diameter (EXHAUST): |
28.448-28.702 mm (1.12-1.13 in) Suffix “D” and later: 34.798-35.052 mm (1.370-1.380 in) |
Valve steam diameter (INTAKE): | 7.8867-7.8994 mm (0.3105-0.311 in) |
Valve steam diameter (EXHAUST): | 7.8334-7.8511 mm (0.3084-0.3091 in) |
Service Data
Engine | |
Maximum speed: | 3,600 rpm |
Valve clearance | |
Intake valve clearance: | 0.20-0.25 mm (0.0079-0.0098 in) |
Exhaust valve clearance: | 0.43-0.48 mm (0.0169-0.0189 in) |
Oil system | |
Lubrication system: | Splash type |
Oil type: | SF or SG |
Recommended oil: |
Summer: SAE 30W Winter: SAE 5W-20, 5W-30 |
Oil capacity: |
K321: 1.9 L (2.01 US. qt, 1.67 Imp. qt.) K321A: 1.2 L (1.27 US. qt, 1.06 Imp. qt.) |
Fuel system | |
Type: | Carburetor (Kohler or Walbro – fixed main jet or adjustable main jet) |
Ignition system | |
Type: | Magneto ignition system, battery ignition system, breakerless ignition system |
Spark plug: | Champion RH10 |
Spark plug gap: | 0.65 mm (0.0256 in) |
Spark plug torque: | 27 N·m (2.8 kg·m, 19.9 ft·lb) |
Applications
Manufacturer or Brand | Models |
Lawn tractors | |
Cub Cadet | 147, 149, 1450 |
J.I.Case | 444 (1969-1976), 444 (1977-1985)> |
John Deere | 140, 214, 314 |
Wheel Horse | GT-14 |