Kohler CH440

Kohler CH440The 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
ModelCommand PRO CH440
Type4-stroke, OHV, single-cylinder
Displacement429 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. torque30.5 Nm (3.1 kg·m; 22.5 ft·lb) at 2,800 rpm
Fuel systemCarburetor with a fixed main jet
Cooling systemForced-air
Ignition systemDependable electronic magneto
Lubricating systemSplash type
Starting systemRecoil starter
Fuel usedUnleaded 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 weight33.0 kg (72.8 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: CH440: 8.0:1
CH440DF: 8.3:1
Bore x Stroke89.0 mm X 69.0 mm (3.50 x 2.70 in)
Sleeve internal diameter89.000-89.015 mm (3.5039-3.50454 in)
Number of piston rings (compression / oil):2 / 1
Thrust face outer diameter88.955-88.975 mm (3.5020-3.5030 in)
Piston pin outer diameter19.992-19.998 mm (0.7871-0.7873 in)
Ring-to-groove side clearance:Top0.045 mm (0.0018 in)
Second0.045 mm (0.0018 in)
Oil0.090-0.150 mm (0.0035-0.0060 in)
Ring end gap:Top0.250-0.400 mm (0.0100-0.0160 in)
Second0.640-0.800 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
Valve head diameter:INTAKE35.875-36.125 mm (1.4124-1.4222 in)
EXHAUST32.875-33.125 mm (1.2943-1.3041 in)
Stem outer diameter:INTAKE6.560-6.575 mm (0.2583-0.2589 in)
EXHAUST6.545-6.560 mm (0.2577-0.2583 in)
Cam lobe profile:INTAKE32.286 mm (1.271 in)
EXHAUST32.506 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 rod20.0 Nm (2.0 kgf·m; 14.8 lb·ft)
Flywheel113.0 Nm (11.5 kgf·m; 83.4 lb·ft)
Spark plug27.0 Nm (2.75 kg·m; 20.0 ft·lb)

Service Information

Valve clearance
Intake0.0762-0.1270 mm (0.0030-0.0050 in)
Exhaust0.0762-0.1270 mm (0.0030-0.0050 in)
Oil system
Oil typeAPI SJ or higher
Recommended oilSAE 10W-30
Oil capacity1.1 liters (1.16 US.qts, 0.97 Imp. qts)
Ignition system
Spark plugKohler 1413214-S
Spark plug gap0.76 mm (0.0300 in)
Ignition module air gap0.254 mm (0.010 in)
Author: Sergei Wers
About: 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.

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