The Kohler LH755 is a 747 cc (45.6 cu·in) natural aspirated V-twin four-stroke liquid-cooled internal combustion small gasoline engine with a horizontal shaft from the Aegis series, manufactured by Kohler Co for general-purpose applications.
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 28.4 PS (20.9 KW; 28.0 HP) at 3,600 rpm of maximum horsepower and 61.5 Nm (6.27 kg·m; 45.4 ft·lb) at 2,800 rpm of peak torque.
The Kohler Aegis LH755 features:
- OHV (overhead valve) design
- Hydraulic valve system
- Electronic ignition system
- One-barrel carburetor with fixed main jet (Keihin)
- Centrifugal flyweight mechanical governor
- Full pressure with Gerotor oil pump lubrication system
- Liquid-cooled cooling system with parallel-flow radiator and integrated belt-driven water pump
- Solenoid shift starter (12V)
General information
Engine Specifications | |
Engine model | Aegis LH755 |
Engine type | 4-stroke, OHV, V-twin |
Displacement | 747 cm3, (45.6 cu·in) |
Max. horsepower | 28.4 PS (20.9 KW; 28.0 HP) at 3,600 rpm |
Max. torque | 61.5 Nm (6.27 kg·m; 45.4 ft·lb) at 2,800 rpm |
Cooling system | Liquid-cooled |
Air cleaner | Heavy-Duty air cleaner |
Lubricating system | Full pressure with gerotor oil pump |
Ignition system | Electronic ignition system |
Fuel system | Carburetor with fixed main jet (Keihin) |
Fuel used | Unleaded gasoline (octane number 86 or higher) |
Starting system | Solenoid shift starter (12V) |
Charging system | 20A charging, regulated |
Governor | Centrifugal flyweight mechanical governor |
PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions (L x W X H) | 432 x 459 x 674 mm (17.0 x 18.1 x 26.5 in) |
Dry weight | 51.7 kg (114.0 lbs) |
Cylinder Block and Head
Cylinder block | |
Compression ratio: | 8.7:1 |
Cylinder bore: | 83.0 mm (3.30 in) |
Piston stroke: | 69.0 mm (2.70 in) |
Cylinder internal diameter (standard): | 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 (standard): | 82.973-82.991 mm (3.2666-3.2673 in) |
Connecting rod small end diameter (standard): | 17.006-17.013 mm (0.6695-0.6698 in) |
Piston pin diameter: | 16.995-17.000 mm (0.6691-0.6693 in) |
Side clearance (Top): | 0.014-0.041 mm (0.0005-0.0016 in) |
Side clearance (Second): | 0.012-0.039 mm (0.0004-0.0015 in) |
Side clearance (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) |
Ring end gap (Second): | 0.250-0.560 mm (0.0098-0.02200 in) |
Piston type B | |
Piston skirt outer diameter (standard): | 82.978 mm (3.1483 in) |
Connecting rod small end diameter (standard): | 17.006-17.013 mm (0.6695-0.6698 in) |
Piston pin diameter: | 16.995-17.000 mm (0.6691-0.6693 in) |
Side clearance (Top): | 0.030-0.070 mm (0.0010-0.0026 in) |
Side clearance (Second): | 0.030-0.070 mm (0.0010-0.0026 in) |
Side clearance (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) |
Ring end gap (Second): | 1.519-1.797 mm (0.0598-0.0708 in) |
Crankshaft | |
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) |
Crankshaft center distance: | 33.5 mm (1.32 in) |
Cylinder head | |
Valve arrangement: | OHV, gear driven |
Valves: | 2 (4 valves in total) |
Valve head diameter (INTAKE): | 33.370-33.630 mm (1.3138-1.324 in) |
Valve head diameter (EXHAUST): | 29.370-29.630 mm (1.1563-1.1665 in) |
Valve face angle (INTAKE): | 45° |
Valve face angle (EXHAUST): | 45° |
Seat angle (INTAKE): | 89° |
Seat angle (EXHAUST): | 89° |
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 lift (min) (INTAKE): | 8.88 mm (0.3496 in) |
Valve lift (min) (EXHAUST): | 8.88 mm (0.3496 in) |
Camshaft journal diameter : | 19.962-19.975 mm (0.7859-0.7864 in) |
Tightening torque specs
Tightening torque specs | |
Intake manifold (torque in 2 increments) | Step 1: 7.4 Nm (0.8 kgf·m; 5.5 lb·ft) Step 2: 9.9 Nm (1.0 kgf·m; 7.3 lb·ft) |
Carburetor mounting | 9.9 Nm (1.0 kgf·m; 7.3 lb·ft) |
Connecting rod cap | 11.3 Nm (1.15 kg·m; 8.3 ft·lb) |
Oil drain plugs | 13.6 Nm (1.4 kg·m; 10.0 ft·lb) |
Cylinder head (torque in 2 increments) | Step 1: 16.9 Nm (1.7 kg·m; 12.5 ft·lb) Step 2: 33.9 Nm (3.5 kg·m; 25.0 ft·lb) |
Rocker pivot | 11.3 Nm (1.1 kg·m; 8.34 ft·lb) |
Rear fan shaft to mounting bracket nut | 15.8 Nm (1.6 kgf·m; 11.7 lb·ft) |
Front fan assembly to fan shaft nut | 15.8 Nm (1.6 kgf·m; 11.7 lb·ft) |
Flywheel | 66.4 Nm (6.77 kg·m; 49 ft·lb) |
Spark plug | 27 Nm (2.75 kg·m; 19.93 ft·lb) |
Muffler retaining nuts | 24.4 Nm (2.5 kg·m; 18.0 ft·lb) |
Valve cover | 6.2 Nm (0.63 kg·m; 4.6 ft·lb) |
Governor lever nut | 6.8 Nm (0.7 kgf·m; 5.0 lb·ft) |
Service Data
Engine | |
Idle speed: | 1200±75 rpm |
Compression pressure | |
Compression differential limit between cylinders: | 15% and less |
Oil system | |
Lubrication system: | Full pressure with gerotor oil pump |
Oil type: | SAE 10W-30 |
Recommended oil: | API SG, SH, SJ, or higher |
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) |
Ignition system | |
Type: | Electronic ignition system |
Spark plug: | Champion RC14YC or Kohler 6613201-S |
Spark plug gap: | 0.76 mm (0.030 in) |
Spark plug torque: | 27 N·m (2.8 kg·m, 19.9 ft·lb) |
Ignition module air gap: | 0.20-0.30 mm (0.008-0.012 in) |
Cooling system | |
Cooling system: | Liquid-cooled cooling system with parallel-flow radiator and integrated belt-driven water pump |
Coolant capacity: | 2.0 liters (2.1 US.qts, 1.8 Imp. qts) |
References
1. Kohler Aegis LH630, LH640, LH685, LH690, LH750, LH755 service manual. Kohler Co. 2021.
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.
Be the first to comment