Kohler ECV749

Kohler ECV749The Kohler ECV749 is a 747 cc (45.6 cu·in) natural aspirated V-twin four-stroke air-cooled internal combustion small gasoline engine from the Command PRO EFI series with a vertical 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 ECV749 engine a total of 747 cc of displacement. The compression ratio rating is 9.1:1.

The ECV749 engine produces 26.9 PS (19.8 KW; 26.5 HP) at 3,600 rpm of maximum horsepower and 55.5 Nm (5.7 kg·m; 41.0 ft·lb) at 2,600 rpm of peak torque.

The Kohler ECV749 features:

  • OHV design
  • Hydraulic valve lifters
  • Aluminum cylinder block
  • Cast iron cylinder liners
  • Hardened crank journals
  • PTO side-load sleeve bearing
  • Electronic ignition system
  • EFI (electronic fuel injection) system
  • Full pressure lubrication system
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine modelCommand PRO EFI ECV749
Engine type4-stroke, OHV, V-twin
Displacement747 cm3, (45.6 cu·in)
Max. horsepower26.9 PS (19.8 KW; 26.5 HP) at 3,600 rpm
Max. torque55.5 Nm (5.7 kg·m; 41.0 ft·lb) at 2,600 rpm
Cooling systemForced air
Air cleanerHigh-efficiency, heavy-duty air filters
Lubricating systemFull pressure
Ignition systemElectronic ignition system
Fuel systemEFI (electronic fuel injection) system
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemElectric starter
PTO shaft rotationCounterclockwise (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 weight49.0 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
Piston style A
Thrust face outer diameter (standard):82.949-82.967 mm (3.2657-3.2664 in)
Piston pin diameter:16.995-17.000 mm (0.6691-0.6693 in)
Side clearance (Top):0.050-0.095 mm (0.0019-0.0037 in)
Side clearance (Second):0.030-0.075 mm (0.0012-0.00307 in)
Side clearance (Oil):0.010-0.110 mm (0.0004-0.0043 in)
Ring end gap (Top):0.250-0.560 mm (0.0100-0.0224 in)
Ring end gap (Second):0.250-0.560 mm (0.0100-0.0224 in)
Piston style B
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)
Crankshaft
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 lift minimal (INTAKE):8.07 mm (0.3177 in)
Valve lift minimal (EXHAUST):8.07 mm (0.3177 in)
Camshaft journal diameter :19.962-19.975 mm (0.7859-0.7864 in)

Tightening torque specs

Tightening torque specs
Intake manifold mounting
(torque in 2 increments)
Step 1: 7.4 Nm (0.75 kg·m; 5.5 lb·ft)
Step 2: 9.9 Nm (1.00 kg·m; 7.3 lb·ft)
Connecting rod cap fastener Black Coating: 11.6 Nm (1.2 kgf·m; 8.6 lb·ft)
Gray Metallic Coating: 13.6 Nm (1.4 kgf·m; 10.0 lb·ft)
Cylinder head Nut (torque in 2 increments):
Step 1: 16.9 Nm (1.72 kg·m; 12.5 lb·ft)
Step 2: 35.5 Nm (3.62 kg·m; 26.2 lb·ft)
Bolt (torque in 2 increments)
Step 1: 22.6 Nm (2.31 kg·m; 16.7 lb·ft)
Step 2: 41.8 Nm (4.26 kg·m; 30.8 lb·ft)
Fan9.9 Nm (1.0 kg·m; 7.3 lb·ft)
Flywheel71.6 Nm (7.3 kgf·m; 52.8 lb·ft)
Muffler retaining nuts27.8 Nm (2.8 kgf·m; 20.5 lb·ft)
Spark plug27 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 gap0.280-0.330 mm (0.011-0.013 in)

References

1. Kohler Command PRO EFI ECV630-ECV749, CV735, CV26, CV745 service manual. Kohler Co. 2023.

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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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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