The Kohler CH440 is a 429 cc (24.7 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.
The Kohler CH440 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, splash type lubrication system. This engine is equipped with a fixed main jet carburetor and dependable electronic magneto ignition system. Fuel tank capacity is 7.0 liters (7.4 US.qts, 6.16 Imp. qts).
A 89.0 mm (3.50 in) cylinder bore and 69.0 mm (2.70 in) piston stroke give the CH440 engine a total of 429 cc of displacement. The compression ratio rating is 8.0:1.
This engine produces 14.3 PS (10.5 KW; 14.0 HP) at 3,600 rpm of maximum horsepower and 30.5 Nm (3.1 kg·m; 22.5 ft·lb) at 2,800 rpm of peak torque.
This engine is available in dual-fuel conversion, as the Kohler CH440DF engine. It is designed to operate on gasoline and propane fuels with installation of dual-fuel conversion kit.
The breakdown of the engine code is as follows:
- C – Command series
- H – Horizontal PTO shaft
- 440 – Numerical designation
General information
| Engine Specifications | |
| Model | Command PRO CH440 |
| Type | 4-stroke, OHV, single-cylinder |
| Displacement | 429 cm 3 (24.7 cu-in) |
| Max. horsepower | 14.3 PS (10.5 KW; 14.0 HP) at 3,600 rpm CH440DF (liquid propane): 12.9 PS (9.5 KW; 12.7 HP) at 3,600 rpm |
| Max. torque | 30.5 Nm (3.1 kg·m; 22.5 ft·lb) at 2,800 rpm |
| Fuel system | Carburetor with a fixed main jet |
| Cooling system | Forced-air |
| Ignition system | Dependable electronic magneto |
| Lubricating system | Splash type |
| Starting system | Recoil starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Dimensions (L x W X H) | 411 x 452 x 442.5 mm (16.2 x 17.8 x 17.4 in) |
| Dry weight | 33.0 kg (72.8 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | CH440: 8.0:1 CH440DF: 8.3:1 | |
| Bore x Stroke | 89.0 mm X 69.0 mm (3.50 x 2.70 in) | |
| Sleeve internal diameter | 89.000-89.015 mm (3.5039-3.50454 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Thrust face outer diameter | 88.955-88.975 mm (3.5020-3.5030 in) | |
| Piston pin outer diameter | 19.992-19.998 mm (0.7871-0.7873 in) | |
| Ring-to-groove side clearance: | Top | 0.045 mm (0.0018 in) |
| Second | 0.045 mm (0.0018 in) | |
| Oil | 0.090-0.150 mm (0.0035-0.0060 in) | |
| Ring end gap: | Top | 0.250-0.400 mm (0.0100-0.0160 in) |
| Second | 0.640-0.800 mm (0.025-0.032 in) | |
| Crankshaft main journal diameter: | PTO end: 34.975-34.989 mm (1.3770-1.3775 in) Flywheel end: 35.009-35.027 mm (1.3783-1.3790 in) | |
| Crankpin journal diameter: | 36.975-36.985 mm (1.4557-1.4561 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV | |
| Valves: | 2 | |
| Valve head diameter: | INTAKE | 35.875-36.125 mm (1.4124-1.4222 in) |
| EXHAUST | 32.875-33.125 mm (1.2943-1.3041 in) | |
| Stem outer diameter: | INTAKE | 6.560-6.575 mm (0.2583-0.2589 in) |
| EXHAUST | 6.545-6.560 mm (0.2577-0.2583 in) | |
| Cam lobe profile: | INTAKE | 32.286 mm (1.271 in) |
| EXHAUST | 32.506 mm (1.280 in) | |
Tightening torque specs
| Tightening torque specs | |
| Cylinder head (torque in 2 increments) | Step 1: 25.0 Nm (2.6 kgf·m; 18.5 lb·ft) Step 2: 57.5 Nm (5.9 kgf·m; 42.4 lb·ft) |
| Connecting rod | 20.0 Nm (2.0 kgf·m; 14.8 lb·ft) |
| Flywheel | 113.0 Nm (11.5 kgf·m; 83.4 lb·ft) |
| Spark plug | 27.0 Nm (2.75 kg·m; 20.0 ft·lb) |
Service Information
| Valve clearance | |
| Intake | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Exhaust | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Oil system | |
| Oil type | API SJ or higher |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 1.1 liters (1.16 US.qts, 0.97 Imp. qts) |
| Ignition system | |
| Spark plug | Kohler 1413214-S |
| Spark plug gap | 0.76 mm (0.0300 in) |
| Ignition module air gap | 0.254 mm (0.010 in) |
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