The Kohler HD775 is a 173 cc (10.6 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine from the HD-series with a vertical shaft, manufactured by Kohler Co for general-purpose applications, such as log splitter, pressure washer, tiller, walk-behind mower, yard vacuum.
The cylinder bore and the piston stroke are 70.0 mm (2.75 in) and 45.0 mm (1.80 in), respectively. Compression ratio rating is 8.5:1.
The Kohler HD775 engine produces 10.5 Nm (1.07 kg·m; 7.75 lb·ft) at 2,600 rpm of maximum torque.
The Kohler HD775 features:
- OHV design
- Aluminum cylinder block
- Cast iron cylinder liners
- Dependable electronic magneto ignition system
- Carburetor with fixed main jet
- Mechanical centrifugal governor
- Spalsh type lubrication
- Forced air cooling system
- Recoil starter
General information
| Engine Specifications | |
| Engine model | HD775 |
| Engine type | 4-stroke, OHV, single-cylinder |
| Displacement | 173 cm 3 (10.6 cu-in) |
| Max. horsepower | – |
| Max. torque | 10.5 Nm (1.07 kg·m; 7.75 lb·ft) at 2,600 rpm |
| Cooling system | Forced air |
| Air cleaner | Replaceable, paper element |
| Lubricating system | Splash type |
| Ignition system | Dependable electronic magneto |
| Fuel system | Carburetor with fixed main jet |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 1.4 liters (1.48 US.qts, 1.23 Imp. qts) |
| Starting system | Recoil starter |
| Governor | Mechanical centrifugal governor |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
| Dimensions (L x W X H) | 434 x 353 x 279 mm (17.1 x 13.9 x 11.0 in) |
| Dry weight | 12.2 kg (26.9 lbs) |
Cylinder Block and Head
| Cylinder block | |
| Compression ratio: | 8.5:1 |
| Cylinder bore: | 70.0 mm (2.75 in) |
| Piston stroke: | 45.0 mm (1.80 in) |
| Cylinder internal diameter (standard): | 70.000-70.020 mm (2.7550-2.7560 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 17.990-17.996 mm (0.7082-0.7085 in) |
| Thrust face outer diameter (standard): | 69.960-69.980 mm (2.7543-2.7551 in) |
| Ring-to-groove side clearance (Top): | 0.010-0.020 mm (0.0004-0.0008 in) |
| Ring-to-groove side clearance (Second): | 0.010-0.020 mm (0.0004-0.0008 in) |
| Ring end gap (Top): | 0.100-0.250 mm (0.0039-0.0098 in) |
| Ring end gap (Second): | 0.300-0.500 mm (0.0118-0.0197 in) |
| Number of main bearings: | 2 |
| Crankshaft main journal diameter: | Flywheel: 24.975-24.989 mm (0.9832-0.9838 in) PTO: 26.950-26.970 mm (1.0610-1.0620 in) |
| Crankpin journal diameter: | 29.985-29.995 mm (1.1805-1.1809 in) |
| Cylinder head | |
| Valve arrangement: | OHV, gear driven |
| Valves: | 2 (4 valves in total) |
| Valve head diameter (INTAKE): | 25.875-26.125 mm (1.0187-1.0285 in) |
| Valve head diameter (EXHAUST): | 23.875-24.125 mm (0.9399-0.9498 in) |
| Valve seat angle (INTAKE): | 44.5° |
| Valve seat angle (EXHAUST): | 44.5° |
| Valve seat angle (INTAKE): | 45° |
| Valve seat angle (EXHAUST): | 45° |
| Valve steam diameter (INTAKE): | 5.465-5.480 mm (0.2152-0.2157 in) |
| Valve steam diameter (EXHAUST): | 5.465-5.480 mm (0.2152-0.2157 in) |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod | 12.5 Nm (1.3 kgf·m; 9.2 ft·lb) |
| Cylinder head (torque in 2 increments) | Step 1: 14.0 Nm (1.4 kgf·m; 10.3 ft·lb) Step 2: 27.8 Nm (2.8 kgf·m; 20.5 ft·lb) |
| Rocker arm stud | 13.6 Nm (1.4 kgf·m; 10.0 ft·lb) |
| Rocker arm pivot jam nut | 9.5 Nm (1.0 kgf·m; 7.0 ft·lb) |
| Flywheel | 51.5 Nm (5.3 kgf·m; 38 ft·lb) |
| Muffler | Exhaust stud: 5.0 Nm (0.5 kgf·m; 3.7 ft·lb) Exhaust nut: 9.5 Nm (1.0 kgf·m; 7.0 ft·lb) |
| Spark plug | 27.0 Nm (2.75 kg·m; 20.0 ft·lb) |
| Oil drain plug | 13.6 Nm (1.4 kgf·m; 10.0 ft·lb) |
Service Data
| Valve clearance | |
| Intake/Exhaust: | 0.0762-0.1270 mm (0.0030-0.0050 in) |
| Oil system | |
| Lubrication system: | Splash type |
| Oil type: | API SJ or higher |
| Recommended oil: | SAE 10W-30 |
| Oil capacity: | 0.6 liters (0.63 US.qts, 0.53 Imp. qts) |
| Fuel system | |
| Type: | Carburetor with fixed main jet |
| Fuel filter: | In-line fuel filter |
| Ignition system | |
| Type: | Dependable electronic magneto |
| Spark plug: | Kohler 1413214-S |
| Spark plug gap: | 0.76 mm (0.030 in) |
| Ignition coil air gap | 0.254 mm (0.010 in) |
References
1. Kohler HD Series HD675, HD775 service manual. Kohler Co. 2020.
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