Kohler LV680

Kohler LV680The Kohler LV680/LV680S is a 674 cc, (41.1 cu·in) V-twin liquid-cooled four-stroke internal combustion gasoline engine from the Aegis series, manufactured by Kohler Co.

The Kohler LV680 engine has an OHV (overhead valve) design, vertical PTO-shaft, pressurized lubrication system with Gerotor oil pump. This engine is equipped with a carburetor with a fixed main jet and electronic ignition system.

It has an 80.0 mm (3.15 in) cylinder bore and 67.0 mm (2.64 in) piston stroke. The compression ratio rating is 8.5:1. This engine produced 24.3 PS (17.9 KW; 24.0 HP) at 3,600 rpm of horsepower and 54.2 Nm (5.53 kg·m; 40 ft·lb) at 2,400 rpm of torque.

The breakdown of the engine code is as follows:

  • L – Liquid-cooled
  • V – Vertical PTO shaft
  • 680 – Numerical designation
  • S – Electric start

General information

Engine Specifications
Model AEGIS LV680 / LV680S
Type 4-stroke, OHV, V-twin
Displacement 674 cm 3 (41.1 cu-in)
Max. horsepower 24.3 PS (17.9 KW; 24.0 HP) at 3,600 rpm
Max. torque 54.2 Nm (5.53 kg·m; 40.0 ft·lb) at 2,400 rpm
Fuel system Carburetor with a fixed main jet
Cooling system Liquid-cooled
Ignition system Electronic ignition system
Lubricating system Pressurized lubrication
Starting system Electric starter
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Bore x Stroke 80.0 X 67.0 mm (3.15 x 2.64 in)
Sleeve internal diameter 80.000-80.025 mm (3.1496-3.1506 in)
Piston skirt outer diameter 79.963-79.981 mm (3.1481-3.1489 in)
Number of piston rings (compression / oil): 2 / 1
Connecting rod small end ID 17.015-17.023 mm (0.6699-0.6702 in)
Piston pin outer diameter 16.995-17.000 mm (0.6691-0.6693 in)
Side clearance: Top 0.050-0.096 mm (0.002-0.0038 in)
Second 0.030-0.076 mm (0.0012-0.003 in)
Oil 0.046-0.196 mm (0.0018-0.0077 in)
Ring end gap: Top 0.180-0.430 mm (0.0071-0.0169 in)
Second 0.250-0.460 mm (0.0098-0.0181 in)
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 drive
Valves: 4 (2 per cylinder)
Valve head diameter: INTAKE 33.370-33.630 mm (1.3138-1.324 in)
EXHAUST 29.370-29.630 mm (1.1563-1.1665 in)
Stem outer diameter: INTAKE 6.982-7.000 mm (0.2749-0.2756 in)
EXHAUST 6.970-6.988 mm (0.2744-0.2751 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt Step 1: 16.9 Nm (1.72 kg·m; 12.47 ft·lb)
Step 2: 33.9 Nm (3.46 kg·m; 25.02 ft·lb)
Flywheel 66.4 Nm (6.77 kg·m; 49.0 ft·lb)
Spark plug 27 Nm (2.75 kg·m; 20.0 ft·lb)

Service Information

Oil system
Oil type API SG, SH, SJ, or higher
Recommended oil SAE 10W-30
Oil capacity 1.9 L (2.01 US. qt, 1.67 Imp. qt.)
Cooling system
Type Pressurized cooling system with integrated belt-driven water pump
Coolant capacity 1.4 liters (1.48 US.qts, 1.23 Imp. qts)
Ignition system
Spark plug Champion RC14YC
Spark plug gap 0.76 mm (0.030 in)
Ignition module air gap 0.2-0.3 mm (0.008-0.012 in)
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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