The Kohler PCH680 is a 747 cc (45.6 cu·in) natural aspirated V-twin four-stroke air-cooled internal combustion small propane engine from the Command PRO EFI Propane series with a horizontal shaft, manufactured by Kohler Co for general-purpose applications.
A 83.0 mm (3.27 in) cylinder bore and 69.0 mm (2.72 in) piston stroke give the PCH680 engine a total of 747 cc of displacement. The compression ratio rating is 9.1:1.
The PCH680 engine produces 23.4 PS (17.2 KW; 23.0 HP) at 3,600 rpm of maximum horsepower and 49.8 Nm (5.1 kg·m; 36.7 ft·lb) at 2,200 rpm of peak torque.
The Kohler PCH680 features:
- High efficiency overhead valve design
- Hydraulic valve lifters
- Aluminum cylinder block
- Cast iron cylinder liners
- Hardened, micro-polished, dynamic-balanced crankshaft
- PTO side-load sleeve bearing
- 12V high energy electronic ignition system
- Closed-loop electronic fuel injection (EFI) for propane fuel
- Engine-mounted electronic control unit (ECU)
- Engine-mounted propane fuel pressure regulator for Vapor Withdrawal
- Variable speed governor
- Engine-mounted keyswitch and throttle controls
- Full pressure lubrication system
- Forced air cooling system
- High efficiency, low-noise cooling fan
- High torque solenoid shift starter
- 20 Amp regulated charging system
General information
Engine Specifications | |
Engine model | Command PRO EFI Propane PCH680 |
Engine type | 4-stroke, OHV, V-twin |
Displacement | 747 cm3, (45.6 cu·in) |
Max. horsepower | 23.4 PS (17.2 KW; 23.0 HP) at 3,600 rpm |
Max. torque | 49.8 Nm (5.1 kg·m; 36.7 ft·lb) at 2,200 rpm |
Cooling system | Forced air |
Air cleaner | Heavy duty, dual-element CanisterAir cleaner system (HDAC) |
Lubricating system | Full pressure |
Ignition system | Electronic ignition system |
Fuel system | EFI (electronic fuel injection) system |
Governor | Variable speed governor |
Fuel used | Propane |
Starting system | Electric starter |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
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 |
Cylinder bore: | 83.0 mm (3.27 in) |
Piston stroke: | 69.0 mm (2.72 in) |
Cylinder internal diameter (standard): | 83.006-83.031 mm (3.2680-3.2689 in) |
Number of piston rings (compression / oil): | 2/1 |
Thrust face outer diameter (standard): | 82.978 mm (3.2668 in) |
Piston pin diameter: | 16.995-17.000 mm (0.6691-0.6693 in) |
Side clearance (Top): | 0.030-0.070 mm (0.0010-0.0026 in) |
Side clearance (Second): | 0.030-0.070 mm (0.0010-0.0026 in) |
Side clearance (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) |
Ring end gap (Second): | 1.519-1.797 mm (0.0598-0.0708 in) |
Number of main bearings: | 2 |
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 driven |
Valves: | 2 (4 valves in total) |
Valve head diameter (INTAKE): | 33.370-33.630 mm (1.3138-1.324 in) |
Valve head diameter (EXHAUST): | 29.370-29.630 mm (1.1563-1.1665 in) |
Valve seat angle (INTAKE): | 89° |
Valve seat angle (EXHAUST): | 89° |
Valve seat angle (INTAKE): | 45° |
Valve seat angle (EXHAUST): | 45° |
Valve steam diameter (INTAKE): | 6.982-7.000 mm (0.2749-0.2756 in) |
Valve steam diameter (EXHAUST): | 6.970-6.988 mm (0.2744-0.2751 in) |
Valve margin minimal (INTAKE): | 1.50 mm (0.0591 in) |
Valve margin minimal (EXHAUST): | 1.50 mm (0.0591 in) |
Camshaft journal diameter : | 19.920-19.975 mm (0.7843-0.7864 in) |
Tightening torque specs
Tightening torque specs | |
Intake manifold mounting (torque in 2 increments) | Step 1: 7.8 Nm (0.8 kg·m; 5.8 lb·ft) Step 2: 10.5 Nm (1.1 kg·m; 7.7 lb·ft) |
Connecting rod cap fastener | 13.6 Nm (1.4 kgf·m; 10.0 lb·ft) |
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) |
Muffler retaining nuts | 27.8 Nm (2.8 kgf·m; 20.5 lb·ft) |
Spark plug | 27.0 Nm (2.75 kg·m; 20.0 lb·ft) |
Service Data
Engine | |
Maximum speed: | 3600±50 rpm |
Idle speed: | 1200±75 rpm |
Oil system | |
Lubrication system: | Full pressure |
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 | |
Type: | Electronic ignition system |
Spark plug: | Champion RC12YC or Champion XC12YC |
Spark plug gap: | 0.76 mm (0.030 in) |
Ignition coil air gap | 0.280-0.330 mm (0.011-0.013 in) |
References
1. Kohler Command PRO EFI PCH680, PCH740 service manual. Kohler Co. 2021.
We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.
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