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Kohler Command CH18S Specs
The Kohler CH18/CH18S is a 624 cc, (38.0 cubic inches) V-twin air-cooled
four-stroke internal combustion gasoline engine from the Command PRO
series, manufactured by Kohler Co.
The Kohler CH18 engine has an OHV (overhead valve) design, an aluminum
block with cast iron cylinder liners, a horizontal PTO-shaft,
pressurized lubricating system. The engine is equipped with a carburetor
(Nikki or Keihin) with a fixed main jet and electronic ignition system.
The cylinder bore and the piston stroke are 77.0 mm (3.03 in) and 67.0
mm (2.64 in), respectively. Compression ratio rating is 8.5:1.
The Kohler CH18 engine produced 18.2 PS (13.4 KW; 18.0 HP) at 3,600 rpm
of horsepower or 19.3 PS (14.2 KW; 19.0 HP) at 3,600 rpm, depending of
the engine version.
| General Technical Data |
Engine Model .............. Kohler Command CH18S
Engine Type .............. 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline engine
Number of Cylinders .............. 2
Displacement, cc (cu.in) .............. 624 (38.0)
Engine Bore, mm (in) .............. 77.0 (3.03)
Engine Stroke, mm (in) .............. 67.0 (2.64)
Rated Engine Power, hp (kW) .............. 18.0 (13.4)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lb) .............. 44.4 (32.8)
Torque Speed, rpm .............. 2200
Compression Ratio .............. 8.5:1
Lubrication System .............. Full pressure
Oil Filter Type .............. Full-flow
Air Cleaner Type .............. Replaceable, paper element
Ignition System .............. Electronic magneto
Starting System .............. Electric starter
Electrical System Rating, Volts .............. 12
| Fuel System |
Fuel System Type .............. Carburetor
Carburetor Model .............. Keihin
Carburetor Type .............. One-barrel, fixed main jet
Fuel Pump Type .............. Pulse, mechanical
Fuel Filter Type .............. In-line
Governor Type .............. Mechanical
| Dimensions and Weight |
Overall Length, mm (in) .............. 349 (13.8)
Overall Width, mm (in) .............. 448 (17.7)
Overall Height, mm (in) .............. 481 (19.0)
Overall Net weight, kg (lbs) .............. 41.0 (90)
| Cylinder Block |
Cylinder Bore Inside Diameter (Std), mm (in) .............. 77.000-77.025 (3.0315-3.0325)
Cylinder Bore Inside Diameter (Max), mm (in) .............. 77.063 (3.0340)
Cylinder Bore (Max Out of Round), mm (in) .............. 0.12 (0.0047)
Crankshaft End Play (Free), mm (in) .............. 0.070-0.590 (0.0028-0.0230)
Crankshaft Bore (Crankcase), mm (in) .............. 40.965-41.003 (1.6128-1.6143)
Crankshaft Bore (Closure Plate), mm (in) .............. 40.987-40.974 (1.6136-1.6131)
Crankshaft Bore to Crankshaft Clearance, mm (in) .............. 0.039-0.074 (0.0015-0.0029)
Connecting Rod Journal Outside Diameter, mm (in) .............. 35.955-35.973 (1.4156-1.4163)
Connecting Rod to Crankpin Clearance, mm (in) .............. 0.030-0.055 (0.0012-0.0022)
Connecting Rod to Crankpin Side Clearance, mm (in) .............. 0.26-0.63 (0.0102-0.0248)
Connecting Rod to Piston Pin Clearance, mm (in) .............. 0.015-0.028 (0.0006-0.0011)
Camshaft End Play, mm (in) .............. 0.076-0.127 (0.0030-0.0050)
Camshaft Clearance, mm (in) .............. 0.025-0.063 (0.0010-0.0025)
Camshaft Bore Inside Diameter, mm (in) .............. 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing Outside Diameter, mm (in) .............. 19.962-19.975 (0.7859-0.7864)
| Cylinder Head and Valves |
Cylinder Head (Max Out of Flatness), mm (in) .............. 0.076 (0.003)
Hydraulic Valve Lifter to Crankcase Clearance, mm (in) .............. 0.0241-0.0501 (0.0009-0.0020)
Valve Stem to Valve Guide Clearance (Intake), mm (in) .............. 0.038-0.076 (0.0015-0.0030)
Valve Stem to Valve Guide Clearance (Exhaust), mm (in) .............. 0.050-0.088 (0.0020-0.0035)
Valve Guide Inside Diameter, mm (in) .............. 7.038-7.058 (0.2771-0.2779)
Valve Minimum Lift (Intake), mm (in) .............. 8.07 (0.3177)
Valve Minimum Lift (Exhaust), mm (in) .............. 8.07 (0.3177)
Valve Face Angle, degrees .............. 45
Valve Seat Angle, degrees .............. 89
Valve Insert Outside Diameter (Intake), mm (in) .............. 36.987-37.013 (1.4562-1.4572)
Valve Insert Outside Diameter (Exhaust), mm (in) .............. 32.987-33.013 (1.2987-1.2997)
Valve Guide Depth, mm (in) .............. 6.50 (0.2559)
Valve Head Diameter (Intake), mm (in) .............. 33.37-33.63 (1.3138-1.3240)
Valve Head Diameter (Exhaust), mm (in) .............. 29.37-29.63 (1.1563-1.1665)
Valve Stem Diameter (Intake), mm (in) .............. 6.982-7.000 (0.2749-0.2756)
Valve Stem Diameter (Exhaust), mm (in) .............. 6.970-6.988 (0.2744-0.2751)
| Piston and Piston Rings |
Piston Outside Diameter (Std), mm (in) .............. 76.967-76.985 (3.0302-3.0309)
Piston Outside Diameter (Wear Limit), mm (in) .............. 76.840 (3.0252)
Piston to Cylinder Bore Clearance, mm (in) .............. 0.014-0.057 (0.0005-0.0022)
Piston to Piston Pin Clearance, mm (in) .............. 0.006-0.017 (0.0002-0.0007)
Piston Pin Bore Inside Diameter, mm (in) .............. 17.006-17.012 (0.6695-0.6698)
Piston Pin Outside Diameter, mm (in) .............. 16.995-17.000 (0.6691-0.6693)
Top Ring Groove Clearance, mm (in) .............. 0.040-0.080 (0.0016-0.0031)
Second Ring Groove Clearance, mm (in) .............. 0.040-0.080 (0.0016-0.0031)
Oil Ring Groove Clearance, mm (in) .............. 0.060-0.202 (0.0024-0.0080)
Top Ring End Gap, mm (in) .............. 0.25-0.45 (0.0100-0.0177)
Second Ring End Gap, mm (in) .............. 0.25-0.45 (0.0100-0.0177)
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| Engines Technical Specifications |