Kohler ECV870

Kohler ECV870The Kohler ECV870 is a 824 cc (50.3 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 86.0 mm (3.40 in) cylinder bore and 71.0 mm (2.80 in) piston stroke give the ECV870 engine a total of 824 cc of displacement. The compression ratio rating is 8.9:1.

The ECV870 engine produces 31.4 PS (23.1 KW; 31.0 HP) at 3,600 rpm of maximum horsepower and 66.6 Nm (6.8 kg·m; 49.1 ft·lb) of peak torque.

The Kohler ECV870 features:

  • OHV design
  • Aluminum cylinder block
  • Cast iron cylinder liners
  • Electronic ignition system
  • EFI (electronic fuel injection) system
  • Full pressure lubrication system
  • Electronic governor or mechanical governor
  • Forced air cooling system
  • Electric starter

General information

Engine Specifications
Engine model Command PRO EFI ECV870
Engine type 4-stroke, OHV, V-twin
Displacement 824 cm3, (50.3 cu·in)
Max. horsepower 31.4 PS (23.1 KW; 31.0 HP) at 3,600 rpm
Max. torque 66.6 Nm (6.8 kg·m; 49.1 ft·lb)
Cooling system Forced air
Air cleaner High-efficiency, heavy-duty air filters
Lubricating system Full pressure
Ignition system Electronic ignition system
Fuel system EFI (electronic fuel injection) system
Governor Electronic or mechanical
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Electric starter
PTO shaft rotation Counterclockwise (from PTO shaft side)
Dimensions (L x W X H) 500 x 521 x 610 mm (19.7 x 20.5 x 24.0 in)
Dry weight 61.7 kg (136.0 lbs)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.9:1
Cylinder bore: 86.0 mm (3.40 in)
Piston stroke: 71.0 mm (2.80 in)
Cylinder internal diameter (standard): 86.000-86.025 mm (3.3858-3.3868 in)
Number of piston rings (compression / oil): 2/1
Thrust face outer diameter (standard): 85.956-85.974 mm (3.3841-3.3848 in)
Piston pin diameter: 21.996-22.000 mm (0.8660-0.8661 in)
Side clearance (Top): 0.040-0.080 mm (0.0016-0.0031 in)
Side clearance (Second): 0.030-0.070 mm (0.0012-0.0028 in)
Side clearance (Oil): 0.060-0.190 mm (0.0024-0.0074 in)
Ring end gap (Top): 0.150-0.300 mm (0.0059-0.0118 in)
Ring end gap (Second): 0.650-0.800 mm (0.0256-0.0315 in)
Number of main bearings: 2
Crankshaft main journal diameter: 44.978-45.000 mm (1.7708-1.7716 in)
Crankpin journal diameter: 53.000-53.150 mm (2.0866-2.0925 in)
Cylinder head
Valve arrangement: OHV, gear driven
Valves: 2 (4 valves in total)
Valve head diameter (INTAKE): 38.600-38.805 mm (1.5197-1.5295 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 margin minimal (INTAKE): 1.00 mm (0.0393 in)
Valve margin minimal (EXHAUST): 1.00 mm (0.0393 in)
Camshaft journal diameter : 19.920-19.975 mm (0.7842-0.7864 in)

Tightening torque specs

Tightening torque specs
Intake manifold mounting 16.0 Nm (1.6 kgf·m; 11.8 lb·ft)
Connecting rod cap fastener 11.6 Nm (1.2 kgf·m; 8.6 lb·ft)
Cylinder head Step 1: 23.7 Nm (2.4 kgf·m; 17.5 lb·ft)
Step 2: 46.9 Nm (4.8 kgf·m; 34.6 lb·ft)
Flywheel 71.6 Nm (7.3 kgf·m; 52.8 lb·ft)
Muffler retaining nuts 27.8 Nm (2.8 kgf·m; 20.5 lb·ft)
Spark plug 27.0 Nm (2.75 kg·m; 20.0 lb·ft)

Service Data

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: 2.6 liters (2.75 US.qts, 2.29 Imp. qts)
Ignition system
Type: Electronic ignition system
Spark plug: Champion RA8HC
Spark plug gap: 0.76 mm (0.030 in)
Spark plug torque: 27.0 Nm (2.75 kg·m; 20.0 lb·ft)


1. Kohler Command PRO EFI ECV850, ECV860, ECV870, ECV880 service manual. Kohler Co. 2021.

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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