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Kohler Command PRO CH742 Specs
The Kohler CH742 is a 747 cc, (45.6 cubic inches) V-twin air-cooled four-stroke
internal combustion gasoline engine from the Command PRO series,
manufactured by Kohler Co.
The Kohler CH742 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 two-barrel
side-draft carburetor with fixed main jets 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 CH742 engine produced 25.3 PS (18.6 KW; 25.0 HP) at 3,600 rpm
of horsepower and 55.9 Nm (5.7 kgm; 41.2 ft-lb) at 2,600 rpm of maximum
torque.
Engine code identification:
C - Command series,
H - Horizontal PTO shaft,
742 - Displacement (cc).
| General Technical Data |
Engine Model ..................... Kohler Command PRO CH742
Engine Type ..................... 4-cycle V-Twin horizontal shaft air-cooled gasoline
Number of Cylinders ..................... 2
Displacement, cc (cu.in) ..................... 747 (46.0)
Cylinder Bore, mm (in) ..................... 83.0 (3.27)
Piston Stroke, mm (in) ..................... 69.0 (2.70)
Maximum Engine Power, hp (kW) ..................... 25.0 (18.6)
Maximum Engine Speed, rpm ..................... 3600
Peak Torque, Nm (ft-lbs) ..................... 55.9 (41.2)
Torque Speed, rpm ..................... 2400
Compression Ratio ..................... 9.1:1
Lubrication System ..................... Full pressure
Oil Filter Type ..................... Full-flow
Air Cleaner ..................... Replaceable, paper element
Oil Capacity, L (qts) ..................... 1.9 (2.0)
Electrical System Rating, Volts ..................... 12
Starter Type ..................... Electric
| Fuel System |
Fuel System Type ..................... Carburetor
Carburetor Model ..................... Keihin
Carburetor Type ..................... Two-Barrel, fixed main jet
Fuel Pump Type ..................... Pulse or Mechanical
Fuel Filter Type ..................... In-line
Governor Type ..................... Mechanical
| Dimensions and Weight |
Overall Length, mm (in) ..................... 371 (14.6)
Overall Width, mm (in) ..................... 451 (17.7)
Overall Height, mm (in) ..................... 622 (24.5)
Dry Weight, kg (lbs) ..................... 48.0 (105.0)
| Cylinder Block |
Cylinder Bore I.D (Standard), mm (in) ..................... 82.988-83.013 (3.2672-3.2682)
Cylinder Bore I.D (Wear Limit), mm (in) ..................... 83.051 (3.2697)
Cylinder Bore (Max Out of Round), mm (in) ..................... 0.12 (0.0047)
Cylinder Bore Max Taper, mm (in) ..................... 0.05 (0.0020)
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)
Crankshaft Bearing Journal O.D (Flywheel), mm (in) ............. 40.913-40.935 (1.6107-1.6116)
Crankshaft Bearing Journal Max Taper (Flywheel), mm (in) ..................... 0.022 (0.0009)
Crankshaft Bearing Journal O.D (Closure Plate), mm (in) ....... 40.913-40.935 (1.6107-1.6116)
Crankshaft Bearing Journal Max Taper (Closure Plate), mm (in) ..................... 0.022 (0.0009)
Crankshaft T.I.R (PTO End, Crank in Engine), mm (in) ..................... 0.279 (0.0110)
Crankshaft T.I.R (Entire Crank, in V-Blocks), mm (in) ..................... 0.10 (0.0039)
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)
Connecting Rod Journal O.D, mm (in) ..................... 35.955-35.973 (1.4156-1.4163)
Connecting Rod Journal Max Taper, mm (in) ..................... 0.018 (0.0007)
| 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)
Intake Valve Stem to Valve Guide Clearance, mm (in) ..................... 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Stem to Valve Guide Clearance, mm (in) ..................... 0.050-0.088 (0.0020-0.0035)
Intake Valve Guide I.D, mm (in) ..................... 7.038-7.058 (0.2771-0.2779)
Exhaust Valve Guide I.D, mm (in) ..................... 7.038-7.058 (0.2771-0.2779)
Valve Guide Reamer Size (Standard), mm (in) ..................... 7.048 (0.2775)
Valve Guide Reamer Size (0.25 Oversize), mm (in) ..................... 7.298 (0.2873)
Intake Valve Minimum Lift, mm (in) ..................... 8.07 (0.3177)
Exhaust Valve Minimum Lift, mm (in) ..................... 8.07 (0.3177)
Nominal Valve Face Angle, degrees ..................... 45
Nominal Valve Seat Angle, degrees ..................... 89
Intake Valve Head Diameter, mm (in) ..................... 33.37-33.63 (1.3138-1.3240)
Exhaust Valve Head Diameter, mm (in) ..................... 29.37-29.63 (1.1563-1.1665)
Intake Valve Stem Diameter, mm (in) ..................... 6.982-7.000 (0.2749-0.2756)
Exhaust Valve Stem Diameter, mm (in) ..................... 6.970-6.988 (0.2744-0.2751)
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 I.D, mm (in) ..................... 20.000-20.025 (0.7874-0.7884)
Camshaft Bearing O.D, mm (in) ..................... 19.962-19.975 (0.7859-0.7864)
| Piston and Piston Rings |
Piston to Piston Pin Clearance, mm (in) ..................... 0.006-0.017 (0.0002-0.0007)
Piston Pin Bore I.D, mm (in) ..................... 17.006-17.012 (0.6695-0.6698)
Piston Pin O.D, mm (in) ..................... 16.995-17.000 (0.6691-0.6693)
Top Ring Groove Clearance, mm (in) ..................... 0.030-0.070 (0.0010-0.0026)
Second Ring Groove Clearance, mm (in) ..................... 0.030-0.070 (0.0010-0.0026)
Oil Ring Groove Clearance, mm (in) ..................... 0.060-0.190 (0.0022-0.0073)
Top Ring End Gap, mm (in) ..................... 0.189-0.277 (0.0074-0.0109)
Second Ring End Gap, mm (in) ..................... 1.519-1.797 (0.0598-0.0708)
Piston O.D (Standard), mm (in) ..................... 82.978 (3.2668)
Piston O.D (Wear Limit), mm (in) ..................... 82.833 (3.2611)
Piston to Cylinder Bore Clearance, mm (in) ..................... 0.019-0.062 (0.0007-0.0024)
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