Kohler K321

Kohler K321The Kohler K321 is a 512 cc (31.24 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from K-series, manufactured by Kohler Co.

The Kohler K321 engine has an L-head (side valve) design and horizontal PTO-shaft. This engine can be equipped with Kohler or Walbro carburetor and magneto, battery or breakerless ignition systems. The K321 engine used paper air cleaner (oiled foam pre-cleaner was available as an option).

The cylinder bore is 88.9 mm (3.5 in) and the piston stroke is 82.6 mm (3.25 in). This engine produced 14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm of horsepower.

The breakdown of the engine code is as follows:

  • K – K-series
  • 32 – Approximate daisplacement (cu·in)
  • 1 – Single cylinder
  • Suffix (engine is available with the following options):
    S – Electric starter;
    T – Retractable starter;
    ST – Electric and retractable starter;
    EP – Electric plant;
    A – Special oil pan;
    C – Clutch model;
    G – Generator applications;
    P – Pump model;
    Q – Quled model;
    R – Reduction gear;

General information

Engine Specifications
ModelK321
Type4-stroke, L-head, single cylinder
Displacement512 cm 3 (31.24 cu-in)
Max. horsepower14.1 PS (10.4 kW; 14.0 HP) at 3,600 rpm
Max. torque (crank PTO)
Fuel systemCarburetor (Kohler or Walbro, fixed main jet or adjustable main jet)
Cooling systemForced-air
Ignition systemMagneto or battery or breakerless ignition system
Lubricating systemSplash type
Starting systemRecoil or electric starter
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Compression ratio:
Bore x Stroke88.9 X 82.6 mm (3.5 x 3.25 in)
Sleeve internal diameter88.9127-88.8873 mm (3.5005-3.4995 in)
Piston skirt outer diameter88.7501-88.7425 mm (3.4941-3.4938 in)
Number of piston rings (compression / oil):2 / 1
Ring end gapTop0.177-0.432 mm (0.007-0.017 in)
Second0.177-0.432 mm (0.007-0.017 in)
Connecting rod small end ID22.2428-22.2504 mm (0.8757-0.876 in)
Piston pin outer diameter22.2300-22.2352 mm (0.8752-0.8754 in)
Cylinder Head
Valve Arrangement:L-head (sidevalve)
Valves:2
Valve head diameter:INTAKE34.798-35.052 mm (1.370-1.380 in)
EXHAUST 28.448-28.702 mm (1.120-1.130 in)
Suffix “D” and later: 34.798-35.052 mm (1.370-1.380 in)
Stem outer diameter (standard):INTAKE7.887-7.899 mm (0.3105-0.3110 in)
EXHAUST7.833-7.851 mm (0.3084-0.3091 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt34-41 Nm; 3.5-4.2 kg·m; 25-30 ft·lb
Flywheel Nut: 68-81 Nm; 6.98.2 kg·m; 50-60 ft·lb
Screw: 30-35 Nm; 3.0-3.5 kg·m; 22-27 ft·lb
Spark plug25-30 Nm; 2.55-3.06 kg·m; 18-22 ft·lb

Service Information

Engine
Max speed3,600 rpm
Valve clearance
Intake valve clearance0.20-0.25 mm (0.0079-0.0098 in)
Exhaust valve clearance0.43-0.48 mm (0.0169-0.0189 in)
Oil system
Oil typeAPI 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.)
Ignition system
Spark plugChampion: RH10
Spark plug gap0.65 mm (0.0256 in)
ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

Be the first to comment

Leave a Reply

Your email address will not be published.


*