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Kohler ECV870 Engine

The Kohler ECV870 is a 4-cycle V-twin cylinder OHV vertical shaft air-cooled gasoline engine from Command PRO EFI series. A 50.3 cubic inches (0.82 L) engine has a cylinder bore of 3.40" (86 mm), piston stroke of 2.80" (71 mm), and rated power of 31 Hp (23.1 kW) at 3600 rpm. The compression ratio rating is 8.9:1. The Kohler ECV870 engine is equipped with an electronic fuel injection system, full pressure lubrication system, electronic spark ignition, paper element air cleaner, and bendix type electric starter. The operating weight is 136 lbs (62 kg).

General Technical Data

Engine Specifications

Engine Model ................... Kohler Command PRO ECV870 EFI
Engine Type ................... 4-cycle V-Twin OHV air-cooled gasoline
Number of Cylinders ................... 2
Displacement, cc (cu.in) ................... 824 (50.3)
Engine Bore, mm (in) ................... 86.0 (3.40)
Engine Stroke, mm (in) ................... 71.0 (2.80)
Rated Engine Power, hp (kW) ................... 31.0 (23.1)
Rated Engine Speed, rpm ................... 3600
Maximum Torque, Nm (ft-lbs) ................... 66.6 (49.1)
Torque Speed, rpm ................... 2600
Compression Ratio ................... 8.9:1
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) .................. 500 (19.7)
Overall Width, mm (in) .................. 520 (20.5)
Overall Height, mm (in) .................. 610 (24.1)
Net Weight, kg (lbs) .................. 61.8 (136)

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
Engine Oil Capacity, L (qts) ................... 2.6 (2.7)

Ignition System

Spark Plug Type ................... Champion RA8HC
Spark Plug Gap, mm (in) ................... 0.76 (0.030)
Thread Size, mm (in) ................... 14 (0.55)
Spark Plug Torque, Nm (ft-lb) ................... 24.4-29.8 (18-22)

Service Specifications

Cylinder Block

Cylinder Bore I.D (Standard) ................... 86.000-86.025 mm (3.3858-3.3868 in)
Cylinder Bore O.D (Max. Wear Limit) ................... 86.075 mm (3.3888 in)
Cylinder Bore (Max. Out-of-Round) ................... 0.018 mm (0.0007 in)
Cylinder Bore Max Taper ................... 0.05 mm (0.0020 in)
Connecting Rod Journal Outside Diameter .................. 53.00-53.15 mm (2.0866-2.0925 in)
Connecting Rod Journal Max Taper .................. 0.018 mm (0.0007 in)
Connecting Rod to Crankpin Clearance ................... 0.030-0.055 mm (0.0012-0.0022 in)
Connecting Rod to Crankpin Side Clearance ................... 0.31-0.65 mm (0.0122-0.0256 in)
Connecting Rod to Piston Pin Clearance ................... 0.006-0.016 mm (0.0002-0.0006 in)
Crankshaft End Play (Free) ................... 0.104-0.532 mm (0.0041-0.0209 in)
Crankshaft Bore Outside Diameter (Crankcase) .............. 45.043-45.069 mm (1.7733-1.7744 in)
Crankshaft Bore Outside Diameter (Oil Pan) .......... 45.043-45.069 mm (1.7733-1.7744 in)
Crankshaft Bearing Journal Outside Diameter .............. 44.978-45.000 mm (1.7708-1.7716 in)
Crankshaft Bearing Journal Max Taper .................. 0.022 mm (0.0009 in)
Piston to Piston Pin Clearance ................... 0.006-0.016 mm (0.0002-0.0006 in)
Piston Pin Bore Inside Diameter (Standard) ................... 22.06-22.12 mm (0.8685-0.8709 in)
Piston Pin Bore Inside Diameter (Wear Limit) ................... 22.24 mm (0.8759 in)
Piston Pin Outside Diameter (Standard) ................... 21.996-22.000 mm (0.8660-0.8661 in)
Piston Pin Outside Diameter (Wear Limit) ................... 21.995 mm (0.8659 in)
Piston Thrust Face Outside Diameter .................. 85.956-85.974 mm (3.3841-3.3848 in)
Top Ring to Groove Side Clearance ................... 0.04-0.08 mm (0.0016-0.0031 in)
Middle Ring to Groove Side Clearance ................... 0.03-0.07 mm (0.0012-0.0028 in)
Oil Ring to Groove Side Clearance ................... 0.060-0.190 mm (0.0022-0.0073 in)
Top Ring End Gap ................... 0.15-0.30 mm (0.0059-0.0118 in)
Middle Ring End Gap ................... 0.65-0.80 mm (0.0256-0.0315 in)

Cylinder Head and Valves

Cylinder Head Max Out-of-Flatness ................... 0.08 mm (0.0031 in)
Tappet to Crankcase Running Clearance ................... 0.013-0.073 mm (0.0005-0.0029 in)
Intake Valve Lash ................... 0.050-0.127 mm (0.0020-0.0050 in)
Exhaust Valve Lash ................... 0.050-0.127 mm (0.0020-0.0050 in)
Intake Valve Head Diameter .................. 38.600-38.805 mm (1.5197-1.5295 in)
Exhaust Valve Head Diameter .................. 29.375-29.625 mm (1.1565-1.1663 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 ................... 9.35 mm (0.3681 in)
Exhaust Valve Minimum Lift ................... 9.35 mm (0.3681 in)
Camshaft End Play (With Shim) ................... 0.147-0.495 mm (0.006-0.019 in)
Camshaft Running Clearance ................... 0.025-0.105 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 ................... 19.920-19.975 mm (0.7842-0.7864 in)
Intake Cam Lobe ................... 21.47 mm (0.8452 in)
Exhaust Cam Lobe ................... 21.47 mm (0.8452 in)

Tightening Torque Specs

Cylinder Head Bolt, Nm (ft-lb) .................. 23.7-46.9 (17.4-34.5)
Rocker Arm Stud, Nm (ft-lb) .................. 24 (17.6)
Connecting Rod Cap, Nm (ft-lb) .................. 11.6 (8.5)
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) .................. 5.1 (3.8)
Fuel Pump Module, Nm (ft-lb) .................. 9.2 (6.8)
Intake Manifold Mounting, Nm (ft-lb) .................. 16 (11.8)
Valve Cover, Nm (ft-lb) .................. 12.4 (9.1)
Muffler Retaining Nut, Nm (ft-lb) .................. 27.8 (20.4)
Oil Drain Plug, Nm (ft-lb) .................. 21.4 (15.7)
Throttle Body Mounting Stud, Nm (ft-lb) .................. 6 (4.4)
Spark Plug, Nm (ft-lb) .................. 27 (20.1)

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