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Kohler Command CV742

General Technical Data

Kohler CV742 Engine Specifications

Engine Model ..................... Kohler Command CV742
Engine Type ..................... 4-cycle, V-Twin air-cooled gasoline
Number of Cylinders ..................... 2
Displacement, cc (cu.in) ..................... 747 (45.6)
Piston Bore, mm (in) ..................... 83.0 (3.27)
Engine 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) ..................... 55.3 (40.8)
Torque Speed, rpm ..................... 3200
Compression Ratio ..................... 9.1:1
Lubrication System ..................... Full pressure
Oil Filter Type ..................... Full-flow
Air Cleaner ..................... Dual 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 ..................... Walbro
Carburetor Type ..................... Two-barrel side-draft with fixed main jets
Fuel Pump Type ..................... Pulse or Mechanical
Fuel Filter ..................... In-line
Governor Type ..................... Mechanical

Dimensions

Overall Length, mm (in) ..................... 520 (20.5)
Overall Width, mm (in) ..................... 410 (16.2)
Overall Height, mm (in) ..................... 504 (19.9)
Dry weight, kg (lbs) ..................... 48.0 (105)

Kohler CV742 Maintenance Data

Cylinder Block and Valves

Cylinder Bore I.D. (Maximum), mm (in) ..................... 83.051 (3.2697)
Cylinder Head (Max. Out of Flatness), mm (in) ..................... 0.1 (0.004)
Intake Valve Clearance (Cold), mm (in) ..................... 0.038-0.076 (0.0015-0.0030)
Exhaust Valve Clearance (Cold), mm (in) ..................... 0.050-0.088 (0.0020-0.0035)

Engine Oil

Engine Oil Type (Summer Time) ..................... SAE 10W-30
Engine Oil Type (Winter Time) ..................... SAE 5W-30
Oil Classification ..................... API SJ or higher
Oil Capacity (w/o Filter), L (qts) ..................... 1.6 (1.7)
Oil Capacity (with New Filter), L (qts) ..................... 1.8 (1.9)

Carburetor Adjustment

Main Fuel ..................... Not adjustable
Idle Fuel ..................... 3/4 to 1 full turn
Low Idle Speed, rpm ..................... 1500±75
High Idle Speed, rpm ..................... 3600±50

Ignition System

Spark Plug Type ..................... Champion RC12YC/XC12YC
Spark Plug Gap, mm (in) ..................... 0.76 (0.030)
Module Air Gap, mm (in) ..................... 0.203-0.305 0.008-0.012)
Thread Size, mm (in) ..................... 14 (0.55)
Reach, mm (in) ..................... 19.1 (0.75)
Spark Plug Torque, Nm (ft-lbs) ..................... 27 (20)

Service Intervals

Check Air Cleaner Element ..................... Every 25 hours
Change Engine Oil ..................... Every 100 hours
Clean Oil Cooler Fins ..................... Every 100 hours
Change Oil Filter ..................... Every 200 hours
Replace Fuel Filter ..................... Every 200 hours
Replace Air Cleaner Element ..................... Every 250 hours
Check Carburetor Adjustment ..................... Every 200 hours
Replace Air Cleaner Inner Element ..................... Every 500 hours
Check and Adjust Valve Clearance ..................... Every 500 hours
Replace Spark Plug ..................... Every 500 hours

Kohler CV742 Service Specifications

Cylinder Block

Cylinder Bore Inside Diameter (Standard), mm (in) ..................... 82.988-83.013 (3.2672-3.2682)
Cylinder Bore Inside Diameter (Max. 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)
Cylinder Head Max. Out of Flatness, mm (in) ..................... 0.1 (0.004)
Camshaft End Play (W/Shim), 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 Surface Outside Diameter, mm (in) ..................... 19.962-19.975 (0.7859-0.7864)
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)

Valves

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 Inside Diameter, mm (in) ..................... 7.038-7.058 (0.2771-0.2779)
Exhaust Valve Guide Inside Diameter, 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
Valve Seat Angle (Intake/Exhaust), degrees ..................... 89
Intake Valve Insert Outside Diameter, mm (in) ..................... 36.987-37.013 (1.4562-1.4572)
Exhaust Valve Insert Outside Diameter, mm (in) ..................... 32.987-33.013 (1.2987-1.2997)
Intake Valve Guide Depth, mm (in) ..................... 4.00 (0.1575)
Exhaust Valve Guide Depth, mm (in) ..................... 6.50 (0.2559)
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)

Crankshaft

Crankshaft End Play (Free), mm (in) ..................... 0.070-0.590 (0.0028-0.0230)
Crankshaft Bore (In Crankcase), mm (in) ..................... 40.965-41.003 (1.6128-1.6143)
Crankshaft Bore (In Oil Pan), 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)
Flywheel End Main Bearing Journal Outside Diameter, mm (in) ........... 40.913-40.935 (1.6107-1.6116)
Flywheel End Main Bearing Journal Max. Taper, mm (in) ..................... 0.022 (0.0009)
Oil Pan End Main Bearing Journal Outside Diameter, mm (in) ......... 40.913-40.935 (1.6107-1.6116)
Oil Pan End Main Bearing Journal Max. Taper, mm (in) ..................... 0.022 (0.0009)
Connecting Rod Journal Outside Diameter, mm (in) ..................... 35.955-35.973 (1.4156-1.4163)
Connecting Rod Journal Max. Taper, mm (in) ..................... 0.018 (0.0007)
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)

Piston and Piston Rings

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 Compression Ring Groove Clearance, mm (in) ..................... 0.030-0.070 (0.001-0.0026)
Middle Compression Ring Groove Clearance, mm (in) ..................... 0.030-0.070 (0.001-0.0026)
Oil Control Ring Groove Clearance, mm (in) ..................... 0.060-0.190 (0.0022-0.0073)
Top Compression Ring End Gap, mm (in) ..................... 0.189-0.277 (0.0074-0.0109)
Middle Compression Ring End Gap, mm (in) ..................... 1.519-1.797 (0.0598-0.0708)
Piston Thrust Face Outside Diameter (Std), mm (in) ..................... 82.978 (3.2668)
Piston Thrust Face Outside Diameter (Wear Limit), mm (in) ..................... 82.833 (3.2611)
Piston Thrust Face to Cylinder Bore Clearance, mm (in) ..................... 0.019-0.062 (0.0007-0.0024)

Kohler CV742 Tightening Torque Specs

Cylinder Head Nut ..................... 16.9-33.9 Nm (12.5-25.1 ft-lbs)
Cylinder Head Bolt ..................... 22.6-41.8 Nm (16.7-30.8 ft-lbs)
Rocker Arm Screw ..................... 11.3 Nm (8.3 ft-lbs)
Connecting Rod Cap ..................... 11.3 Nm (8.3 ft-lbs)
Flywheel Retaining Screw ..................... 66.4 Nm (49.1 ft-lbs)
Intake Manifold Mounting ..................... 7.4 Nm (5.5 ft-lbs)
Carburetor Mounting Nut ..................... 6.2-7.3 Nm (4.6-5.4 ft-lbs)
Oil Pan ..................... 24.4 Nm (18.1 ft-lbs)
Oil Drain Plug ..................... 13.6 Nm (10.1 ft-lbs)
Governor Lever Nut ..................... 6.8 Nm (5.1 ft-lbs)
Ignition Module ..................... 4.0-6.2 Nm (2.9-4.6 ft-lbs)
Muffler Retaining Nut ..................... 24.4 Nm (18.1 ft-lbs)
Fuel Pump Screw ..................... 2.3 Nm (1.7 ft-lbs)
Spark Plug ..................... 27 Nm (20.1 ft-lbs)