The Kohler CH440 is a 429 cc (24.7 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine from the Command PRO series with a horizontal shaft, manufactured by Kohler Co for general-purpose applications, such as concrete trowel, concrete screed, log splitter, go-kart, edger, air compressor, tiller, pump, pressure washer and etc.
The cylinder bore and the piston stroke are 89.0 mm (3.50 in) and 69.0 mm (2.70 in), respectively. Compression ratio rating is 8.0:1.
The Kohler CH440 engine produces 14.3 PS (10.5 KW; 14.0 HP) at 3,600 rpm of maximum power and 30.5 Nm (3.1 kg·m; 22.5 ft·lb) at 2,800 rpm of maximum torque.
The Kohler CH440 features:
- OHV design
- Aluminum cylinder block
- Cast iron cylinder liners
- Swirl-induction combustion chamber
- Dependable magneto breakerless ignition
- One-barrel carburetor with fixed main jet
- Dual ball bearings
- Steel-forged-andhardened crankshaft
- Mechanical centrifugal governor
- Splash type lubrication system
- Forced air cooling system
- Recoil starter (12-volt starter available as an option)
General information
| Engine Specifications | |
| Engine model | Command PRO CH440 |
| Engine 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 |
| Max. torque | 30.5 Nm (3.1 kg·m; 22.5 ft·lb) at 2,800 rpm |
| Cooling system | Forced air |
| Air cleaner | Quad-Clean heavy-duty cyclonic air cleaner |
| Lubricating system | Splash type lubrication |
| Ignition system | Dependable magneto breakerless ignition |
| Fuel system | One-barrel carburetor with fixed main jet |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 7.0 liters (7.4 US.qts, 6.16 Imp. qts) |
| Starting system | Recoil starter |
| Governor | Mechanical centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| 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: | 8.0:1 |
| Cylinder bore: | 89.0 mm (3.50 in) |
| Piston stroke: | 69.0 mm (2.70 in) |
| Cylinder internal diameter (standard): | 89.000-89.015 mm (3.5039-3.50454 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 19.992-19.998 mm (0.7871-0.7873 in) |
| Thrust face outer diameter (standard): | 88.955-88.975 mm (3.5020-3.5030 in) |
| Connecting rod big end diameter (standard): | 33.020-33.030 mm (1.3000-1.3004 in) |
| Ring-to-groove side clearance (Top): | 0.045 mm (0.0018 in) |
| Ring-to-groove side clearance (Second): | 0.045 mm (0.0018 in) |
| Ring-to-groove side clearance (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) |
| Ring end gap (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) |
| Valve head diameter (EXHAUST): | 32.875-33.125 mm (1.2943-1.3041 in) |
| Valve length (INTAKE): | 86.175-86.375 mm (3.3927-3.4006 in) |
| Valve length (EXHAUST): | 86.341-86.541 mm (3.3993-3.4071 in) |
| Valve seat angle (INTAKE): | 89.5°-90.5° |
| Valve seat angle (EXHAUST): | 89.5°-90.5° |
| Valve seat angle (INTAKE): | 89.5°-90.5° |
| Valve seat angle (EXHAUST): | 89.5°-90.5° |
| Valve steam diameter (INTAKE): | 6.560-6.575 mm (0.2583-0.2589 in) |
| Valve steam diameter (EXHAUST): | 6.545-6.560 mm (0.2577-0.2583 in) |
| Cam lobe profile (INTAKE): | 32.286 mm (1.271 in) |
| Cam lobe profile (EXHAUST): | 32.506 mm (1.280 in) |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod | 20.0 Nm (2.0 kgf·m; 14.8 lb·ft) |
| 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) |
| Flywheel | 113.0 Nm (11.5 kgf·m; 83.4 lb·ft) |
| Spark plug | 27.0 Nm (2.75 kg·m; 20.0 lb·ft) |
Service Data
| Valve lash | |
| Intake/Exhaust: | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | API SJ or higher |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 1.1 liters (1.16 US.qts, 0.97 Imp. qts) |
| Fuel system | |
| Type: | Carburetor with fixed main jet |
| Fuel filter: | In-line fuel filter |
| Ignition system | |
| Type: | Dependable magneto breakerless ignition |
| Spark plug: | Kohler 1413214-S |
| Spark plug gap: | 0.76 mm (0.030 in) |
| Module air gap | 0.254 mm (0.010 in) |
References
1. Kohler Command PRO CH245-CH440 service manual. Kohler Co. 2021.
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