The Kohler PCH740 is a 747 cc, (45.6 cu·in) V-twin air-cooled four-stroke internal combustion propane engine from the Command PRO EFI Propane series, manufactured by Kohler Co.
The Kohler PCH740 engine has an OHV (overhead valve) design, an aluminum block with cast iron cylinder liners, a horizontal PTO-shaft, pressurized lubrication system. This engine is equipped with an EFI (Electronic Fuel Injection) system and electronic ignition system.
The cylinder bore and the piston stroke are 83.0 mm (3.27 in) and 69.0 mm (2.72 in), respectively. Compression ratio rating is 9.1:1.
The Kohler PCH740 engine produced 25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm of horsepower and 50.6 Nm (5.2 kg·m; 37.3 ft·lb) at 2,400 rpm of torque.
The breakdown of the engine code is as follows:
- P – EFI Propane series
- C – Command series
- H – Horizontal PTO shaft
- 740 – Numerical designation
General information
| Engine Specifications | |
| Model | Command PRO EFI Propane PCH7400 |
| Type | 4-stroke, OHV, V-twin |
| Displacement | 747 cm 3 (45.6 cu-in) |
| Max. horsepower | 25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm |
| Max. torque | 50.6 Nm (5.2 kg·m; 37.3 ft·lb) at 2,400 rpm |
| Fuel system | EFI (Electronic Fuel Injection) |
| Cooling system | Forced-air |
| Ignition system | Electronic ignition system |
| Lubricating system | Pressurized lubrication |
| Starting system | Electric starter |
| Fuel used | Propane |
| Dimensions (L x W X H) | 376 x 480 x 622 mm (14.8 x 18.9 x 24.5 in) |
| Dry weight | 49.0 kg (108.0 lbs) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 9.1:1 | |
| Bore x Stroke | 83.0 mm X 69.0 mm (3.27 x 2.72 in) | |
| Sleeve internal diameter | 83.006-83.031 mm (3.2680-3.2689 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Thrust face outer diameter | 82.978 mm (3.2668 in) | |
| Piston pin outer diameter | 16.995-17.000 mm (0.6691-0.6693 in) | |
| Ring-to-groove side clearance: | Top | 0.030-0.070 mm (0.0010-0.0026 in) |
| Second | 0.030-0.070 mm (0.0010-0.0026 in) | |
| Oil | 0.060-0.190 mm (0.0022-0.0073 in) | |
| Ring end gap: | Top | 0.189-0.277 mm (0.0074-0.0109 in) |
| Second | 1.519-1.797 mm (0.0598-0.0708 in) | |
| Crankshaft main journal diameter: | 40.913-40.935 mm (1.6107-1.6116 in) | |
| Crankpin journal diameter: | 35.955-35.973 mm (1.4155-1.4163 in) | |
| Cylinder Head | ||
| Valve Arrangement: | OHV, gear drive | |
| Valves: | 4 (2 per cylinder) | |
| Valve head diameter: | INTAKE | 33.370-33.630 mm (1.3138-1.324 in) |
| EXHAUST | 29.370-29.630 mm (1.1563-1.1665 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 |
Step 1: 16.9 Nm (1.72 kg·m; 12.5 lb·ft) Step 2: 33.9 Nm (3.50 kg·m; 25.0 lb·ft) |
| Flywheel | 71.6 Nm (7.3 kgf·m; 52.8 lb·ft) |
| Spark plug | 27.0 Nm (2.75 kg·m; 20.0 lb·ft) |
Service Information
| Oil system | |
| Oil type | API SJ, or higher |
| Recommended oil | SAE 10W-30, Kohler PRO 10W-50 |
| 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 or XC12YC |
| Spark plug gap | 0.76 mm (0.030 in) |
| Ignition module air gap | 0.280-0.330 mm (0.011-0.013 in) |
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