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Kohler ECV740 Engine

The Kohler ECV740 is a 4-stroke V-twin cylinder overhead valve vertical shaft air-cooled gasoline engine from Command PRO EFI series. A 45.6 cu. in (747 cc) engine has a cylinder bore of 3.27" (83 mm), piston stroke of 2.72" (69 mm), and rated power of 25 Hp (18.6 kW) at 3600 rpm. The compression ratio rating is 9.1:1. The Kohler ECV740 engine is equipped with a cast-iron cylinder liners, electronic fuel injection, forced-air cooling system, pressurized lubrication system, and air cleaner with paper element. The operating weight is 94 lbs (43 kg).

General Technical Data

Engine Specifications

Engine Model ................... Kohler Command PRO ECV740 EFI
Engine Type ................... 4-cycle V-Twin OHV air-cooled gasoline
Number of Cylinders ................... 2
Displacement, cc (cu.in) ................... 747 (45.6)
Engine Bore, mm (in) ................... 83.0 (3.27)
Engine Stroke, mm (in) ................... 69.0 (2.72)
Rated Engine Power, hp (kW) ................... 25.0 (18.6)
Rated Engine Speed, rpm ................... 3600
Maximum Torque, Nm (ft-lbs) ................... 54.1 (39.9)
Torque Speed, rpm ................... 2400
Compression Ratio ................... 9.1:1
Fuel System ................... Electronic fuel injection (EFI)
Lubrication System ................... Full pressure
Oil Filter Type ................... Full-flow type
Air Cleaner Type ................... Replaceable, paper element
Cooling System .................. Forced-air
Ignition System .................. Electronic
Starter Type ................... Electric
Electrical System Rating, Volts ................... 12

Dimensions and Weight

Overall Length, mm (in) .................. 540 (21.3)
Overall Width, mm (in) .................. 470 (18.5)
Overall Height, mm (in) .................. 445 (17.6)
Net Weight, kg (lbs) .................. 49 (108)

Maintenance Data

Engine Oil

Engine Oil Type (Summer) ................... SAE 10W-30, Kohler PRO 10W-50
Engine Oil Type (Winter) ................... SAE 5W-20, 5W-30
Oil Classification (API) ................... SJ or higher
Oil Capacity (w/o Filter), L (qts) ................... 1.7 (1.8)
Oil Capacity (with New Filter), L (qts) ................... 1.9 (2.0)

Ignition System

Spark Plug Type ................... Champion RC12YC or XC12YC
Spark Plug Gap, mm (in) ................... 0.76 (0.030)
Module Air Gap, mm (in) ................... 0.28-0.33 (0.011-0.013)
Thread Size, mm (in) ................... 14 (0.55)
Reach, mm (in) ................... 19.1 (0.75)
Spark Plug Torque, Nm (ft-lb) ................... 24.4-29.8 (18-22)

Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard) ................... 83.006-83.031 mm (3.2680-3.2689 in)
Cylinder Bore O.D (Max. Wear Limit) ................... 83.081 mm (3.2709 in)
Cylinder Bore (Max. Out-of-Round) ................... 0.12 mm (0.0047 in)
Cylinder Bore Max Taper ................... 0.05 mm (0.0020 in)
Connecting Rod Journal Outside Diameter .................. 35.950-35.973 mm (1.4153-1.4163 in)
Connecting Rod Journal Max Taper .................. 0.018 mm (0.0007 in)
Connecting Rod to Crankpin Clearance ................... 0.043-0.073 mm (0.0017-0.0029 in)
Connecting Rod to Crankpin Side Clearance ................... 0.26-0.63 mm (0.0102-0.0248 in)
Connecting Rod to Piston Pin Clearance ................... 0.015-0.028 mm (0.0006-0.0011 in)
Crankshaft End Play (Free) ................... 0.070-0.590 mm (0.0028-0.0230 in)
Crankshaft to Sleeve Bearing Clearance ................... 0.03-0.09 mm (0.0012-0.0035 in)
Crankshaft Bore Outside Diameter (Crankcase) .............. 40.972-40.997 mm (1.6131-1.6141 in)
Crankshaft Bore Outside Diameter (Closure Plate) .......... 40.974-41.000 mm (1.6131-1.6141 in)
Crankshaft Bearing Journal Outside Diameter (Flywheel) .............. 40.913-40.935 mm (1.6107-1.6116 in)
Crankshaft Bearing Journal Max Taper (Flywheel) .................. 0.022 mm (0.0009 in)
Crankshaft Bearing Journal Outside Diameter (Closure Plate) .......... 40.913-40.935 mm (1.6107-1.6116 in)
Crankshaft Bearing Journal Max Taper (Closure Plate) .................. 0.022 mm (0.0009 in)
Piston to Piston Pin Clearance ................... 0.006-0.017 mm (0.0002-0.0007 in)
Piston Pin Bore Inside Diameter ................... 17.006-17.012 mm (0.6695-0.6698 in)
Piston Pin Outside Diameter ................... 16.995-17.000 mm (0.6691-0.6693 in)
Piston Thrust Face Outside Diameter (Piston A) .................. 82.949-82.967 mm (3.2657-3.2664 in)
Top Ring Groove Side Clearance (Piston A) .................. 0.050-0.095 mm (0.0019-0.0037 in)
Middle Ring Groove Side Clearance (Piston A) .................. 0.030-0.076 mm (0.0012-0.0031 in)
Oil Ring Groove Side Clearance (Piston A) .................. 0.010-0.110 mm (0.0004-0.0043 in)
Top Ring End Gap (Piston A) .................. 0.250-0.560 mm (0.0100-0.0224 in)
Middle Ring End Gap (Piston A) .................. 0.250-0.560 mm (0.0100-0.0224 in)
Piston Thrust Face Outside Diameter (Piston B) .................. 82.978 mm (3.2668 in)
Top Ring to Groove Side Clearance (Piston B) ................... 0.030-0.070 mm (0.001-0.0026 in)
Middle Ring to Groove Side Clearance (Piston B) ................... 0.030-0.070 mm (0.001-0.0026 in)
Oil Ring to Groove Side Clearance (Piston B) ................... 0.060-0.190 mm (0.0022-0.0073 in)
Top Ring End Gap (Piston B) ................... 0.189-0.277 mm (0.0074-0.0109 in)
Middle Ring End Gap (Piston B) ................... 1.519-1.797 mm (0.0598-0.0708 in)

Cylinder Head and Valves

Cylinder Head Max Out-of-Flatness ................... 0.076 mm (0.003 in)
Hydraulic Valve Lifter to Crankcase Clearance ................... 0.0241-0.0501 mm (0.0009-0.0020 in)
Intake Valve Head Diameter .................. 33.370-33.630 mm (1.3138-1.324 in)
Exhaust Valve Head Diameter .................. 29.370-29.630 mm (1.1563-1.1665 in)
Intake Valve Stem O.D (Standard) .................. 6.982-7.000 mm (0.2749-0.2756 in)
Exhaust Valve Stem O.D (Standard) .................. 6.970-6.988 mm (0.2744-0.2751 in)
Intake Valve Stem to Valve Guide Clearance ................... 0.038-0.076 mm (0.0015-0.0030 in)
Exhaust Valve Stem to Valve Guide Clearance ................... 0.050-0.088 mm (0.0020-0.0035 in)
Intake Valve Guide I.D ................... 7.038-7.058 mm (0.2771-0.2779 in)
Exhaust Valve Guide I.D ................... 7.038-7.058 mm (0.2771-0.2779 in)
Intake Valve Minimum Lift ................... 8.07 mm (0.3177 in)
Exhaust Valve Minimum Lift ................... 8.07 mm (0.3177 in)
Camshaft End Play (With Shim) ................... 0.076-0.127 mm (0.0030-0.0050 in)
Camshaft Clearance ................... 0.025-0.063 mm (0.0010-0.0025 in)
Camshaft Bore I.D ................... 20.000-20.025 mm (0.7874-0.7884 in)
Camshaft Bearing Surface O.D ................... 19.962-19.975 mm (0.7859-0.7864 in)

Tightening Torque Specs

Cylinder Head Nut, Nm (ft-lb) .................. 16.9-33.9 (12.5-25.1)
Cylinder Head Bolt, Nm (ft-lb) .................. 22.6-41.8 (16.7-30.8)
Rocker Arm Screw, Nm (ft-lb) .................. 18.1 (13.3)
Connecting Rod Cap, Nm (ft-lb) .................. 11.3 (8.3)
Flywheel Retaining Screw, Nm (ft-lb) .................. 71.6 (52.8)
Governor Lever Nut, Nm (ft-lb) .................. 7.1 (5.2)
Ignition ECU, Nm (ft-lb) .................. 6.2 (4.6)
Fuel Pump Module, Nm (ft-lb) .................. 9.2 (6.8)
Intake Manifold Mounting, Nm (ft-lb) .................. 7.8 (5.7)
Valve Cover, Nm (ft-lb) .................. 9 (6.6)
Muffler Retaining Nut, Nm (ft-lb) .................. 27.8 (20.4)
Closure Plate, Nm (ft-lb) .................. 25.6 (18.8)
Spark Plug, Nm (ft-lb) .................. 27 (20.1)

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