The Kohler LH775 is a 747 cc, (45.6 cu·in) V-twin liquid-cooled four-stroke internal combustion gasoline engine from the Aegis series, manufactured by Kohler Co.
The Kohler LH775 engine has an OHV (overhead valve) design, horizontal PTO-shaft, pressurized lubrication system with oil pump. This engine is equipped with an electronic fuel injection (EFI) system and an electronic ignition system.
It has an 83.0 mm (3.30 in) cylinder bore and 69.0 mm (2.70 in) piston stroke. The compression ratio rating is 8.7:1. This engine produced 31.4 PS (23.1 KW; 31.0 HP) at 3,600 rpm of horsepower and 64.6 Nm (6.6 kg·m; 47.7 ft·lb) at 2,400 rpm of peak torque.
The breakdown of the engine code is as follows:
- L – Liquid-cooled
- H – Horizontal PTO shaft
- 775 – Numerical designation
General information
| Engine Specifications | |
| Model | AEGIS LH775 |
| Type | 4-stroke, OHV, V-twin |
| Displacement | 747 cm 3 (45.6 cu-in) |
| Max. horsepower | 31.4 PS (23.1 KW; 31.0 HP) at 3,600 rpm |
| Max. torque | 64.6 Nm (6.6 kg·m; 47.7 ft·lb) at 2,400 rpm |
| Fuel system | Electronic fuel injection (EFI) system |
| 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: | 8.7:1 | |
| Bore x Stroke | 83.0 X 69.0 mm (3.30 x 2.70 in) | |
| Sleeve internal diameter | 83.006-83.031 mm (3.2679-3.2689 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Piston type A | ||
| Piston skirt outer diameter | 82.973-82.991 mm (3.2666-3.2673 in) | |
| Connecting rod small end ID | 17.006-17.013 mm (0.6695-0.6698 in) | |
| Piston pin outer diameter | 16.995-17.000 mm (0.6691-0.6693 in) | |
| Side clearance: | Top | 0.014-0.041 mm (0.0005-0.0016 in) |
| Second | 0.012-0.039 mm (0.0004-0.0015 in) | |
| Oil | 0.026-0.176 mm (0.0010-0.0070 in) | |
| Ring end gap: | Top | 0.250-0.560 mm (0.0098-0.02200 in) |
| Second | 0.250-0.560 mm (0.0098-0.02200 in) | |
| Piston type B | ||
| Piston skirt outer diameter | 82.978 mm (3.1483 in) | |
| Connecting rod small end ID | 17.006-17.013 mm (0.6695-0.6698 in) | |
| Piston pin outer diameter | 16.995-17.000 mm (0.6691-0.6693 in) | |
| Side clearance: | Top | 0.030-0.070 mm (0.0010-0.0026 in) |
| Second | 0.030-0.070 mm (0.0010-0.0026 in) | |
| 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) |
| Second | 1.519-1.797 mm (0.0598-0.0708 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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