Kohler CH15

Kohler CH15The Kohler CH15/CH15S is a 426 cc (26.0 cu·in) single-cylinder air-cooled four-stroke internal combustion gasoline engine from the Command PRO series, manufactured by Kohler Co.

The Kohler CH15 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, full-pressurized lubrication system. This engine is equipped with a carburetor (Nikki or Keihin) with a fixed main jet and dependable electronic magneto ignition system.

A 90.0 mm (3.54 in) cylinder bore and 67.0 mm (2.64 in) piston stroke give the CH15 engine a total of 426 cc of displacement. The compression ratio rating is 8.5:1.

This engine produced 15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm of horsepower and 34.3 Nm (3.5 kg·m; 25.3 ft·lb) at 2,400 rpm of torque.

The breakdown of the engine code is as follows:

  • C – Command series
  • H – Horizontal PTO shaft
  • 15 – Numerical designation
  • Version code:
    • S – Electric start
    • T – Retractable start
    • ST – Electric/Retractable start
    • GT – Generator application/Retractable start
    • GS – Generator application/Electric start
    • PT – Pump/Retractable start
    • RT – Gear reduction/Retractable start

General information

Engine Specifications
Model Command PRO CH15 / CH15S
Type 4-stroke, OHV, single-cylinder
Displacement 426 cm 3 (26.0 cu-in)
Max. horsepower 15.2 PS (11.2 KW; 15.0 HP) at 3,600 rpm
Max. torque 34.3 Nm (3.5 kg·m; 25.3 ft·lb) at 2,400 rpm
Fuel system Carburetor with a fixed main jet (Nikki or Keihin)
Cooling system Forced-air
Ignition system Dependable electronic magneto
Lubricating system Pressurized lubrication
Starting system Electric starter
Fuel used Unleaded gasoline (octane number 86 or higher)
Dimensions (L x W X H) 340 x 502 x 449 mm (13.41 x 19.8 x 17.7 in)
Dry weight 39.5 kg (87.1 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Bore x Stroke 90.0 mm X 67.0 mm (3.54 x 2.64 in)
Sleeve internal diameter 90.000-90.025 mm (3.5433-3.5443 in)
Number of piston rings (compression / oil): 2 / 1
Thrust face outer diameter 89.951-89.969 mm (3.5413-3.5420 in)
Piston pin outer diameter 18.995-19.000 mm (0.7478-0.748 in)
Ring-to-groove side clearance: Top 0.060-0.105 mm (0.0023-0.0041 in)
Second 0.040-0.085 mm (0.0015-0.0033 in)
Oil 0.176-0.260 mm (0.0067-0.0100 in)
Ring end gap: Top 0.270-0.510 mm (0.0105-0.0200 in)
Second 0.270-0.510 mm (0.0105-0.0200 in)
Crankshaft main journal diameter: Flywheel end: 44.913-44.935 mm (1.7682-1.7691 in)
Oil pan end: 41.915-41.935 mm (1.6502-1.6510 in)
Crankpin journal diameter: 38.958-38.970 mm (1.5338-1.5342 in)
Cylinder Head
Valve Arrangement: OHV, gear drive
Valves: 2
Valve head diameter: INTAKE 35.370-35.630 mm (1.3925-1.4028 in)
EXHAUST 31.370-31.630 mm (1.235-1.2453 in)
Stem outer diameter: INTAKE 6.982-7.000 mm (0.2749-0.2756 in)
EXHAUST 6.970-6.988 mm (0.2744-0.2751 in)

Tightening torque specs

Tightening torque specs
Cylinder head (torque in 2 increments) Step 1: 20.0 Nm (2.0 kg·m; 15.0 ft·lb)
Step 2: 40.0 Nm (4.0 kg·m; 30.0 ft·lb)
Flywheel 66.4 Nm (6.77 kg·m; 49 ft·lb)
Spark plug 38.0-43.4 Nm (3.9-4.4 kgf·m; 28.0-32.0 lb·ft)

Service Information

Oil system
Oil type API SG, SH, SJ, or higher
Recommended oil SAE 10W-30
Oil capacity W/o oil filter: 1.7 L (1.8 US. qt, 1.5 Imp. qt.)
With oil filter: 1.9 L (2.0 US.qts, 1.7 Imp. qts)
Ignition system
Spark plug Champion RC12YC
Spark plug gap 1.00 mm (0.0394 in)
Ignition module air gap 0.200-0.300 mm (0.0079-0.0118 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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