Kohler LH630

Kohler LH630The Kohler LH630 is a 624 cc, (38.1 cu·in) V-twin liquid-cooled four-stroke internal combustion gasoline engine from the Aegis series, manufactured by Kohler Co.

The Kohler LH630 engine has an OHV (overhead valve) design, horizontal PTO-shaft, pressurized lubrication system with oil pump. This engine is equipped with a one-barrel carburetor (Keihin) with a fixed main jet and electronic ignition system.

It has an 77.0 mm (3.03 in) cylinder bore and 67.0 mm (2.64 in) piston stroke. The compression ratio rating is 8.5:1. This engine produced 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm of horsepower and 48.0 Nm (4.9 kg·m; 35.42 ft·lb) at 2,200 rpm of peak torque.

The breakdown of the engine code is as follows:

  • L – Liquid-cooled
  • H – Horizontal PTO shaft
  • 630 – Numerical designation

General information

Engine Specifications
Model AEGIS LH630
Type 4-stroke, OHV, V-twin
Displacement 624 cm 3 (38.1 cu-in)
Max. horsepower 22.3 PS (16.4 KW; 22.0 HP) at 3,600 rpm
Max. torque 48.0 Nm (4.9 kg·m; 35.42 ft·lb) at 2,200 rpm
Fuel system One-barrel carburetor with a fixed main jet (Keihin)
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)

Cylinder Block and Head

Cylinder block
Compression ratio: 8.5:1
Bore x Stroke 77.0 X 67.0 mm (3.03 x 2.64 in)
Sleeve internal diameter 77.000-77.025 mm (3.0315-3.0325 in)
Piston skirt outer diameter 76.968-76.986 mm (3.0302-3.0309 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 0.040-0.086 mm (0.0016-0.0034 in)
Second 0.040-0.086 mm (0.0016-0.0034 in)
Oil 0.046-0.196 mm (0.0018-0.0077 in)
Ring end gap: Top 0.180-0.380 mm (0.0071-0.0150 in)
Second 0.250-0.450 mm (0.0098-0.0177 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 W/o oil filter: 1.6 liters (1.7 US.qts, 1.4 Imp. qts)
With oil filter: 1.8 liters (1.9 US.qts, 1.58 Imp. qts)
Cooling system
Type Pressurized cooling system with integrated belt-driven water pump
Coolant capacity 2.0 liters (2.1 US.qts, 1.8 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)
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