Tecumseh HH100 (10 HP, 389 cc) Engine Specs & Review
Tecumseh HH100 Engine Specs
The Tecumseh HH100 engine is a 23.7 cu·in (389 cc) single-cylinder air-cooled four-stroke internal combustion gasoline engine made by Tecumseh.
This Tecumseh HH100 engine produced 10.2 PS (7.5 kW; 10.0 HP) horsepower. The Tecumseh HH100 engine cylinder bore is 84.1 mm (3.31 in), and the piston stroke is 69.8 mm (2.75 in).
This Tecumseh HH100 engine can be fitted with Tecumseh or Walbro carburetor and solid-state ignition system (CDI).
The Tecumseh HH100 engine has a horizontal PTO shaft, cast-iron cylinder block, an L-head (side valve) design, and cast-iron cylinder head.
The breakdown of the Tecumseh HH100 engine code is as follows:
- HH – Horizontal-Heavy Duty
- 100 – 10.0 HP
Tecumseh HH100 (10 HP, 389 cc) Engine Specs
Engine Specifications
| Model | HH100 |
| Type | 4-stroke, L-head, single cylinder |
| Displacement | 389 cm3 (23.7 cu-in) |
| Max. horsepower | 10.2 PS (7.5 kW; 10.0 HP) |
| Max. torque (crank PTO) | – |
| Fuel system | Carburetor (Tecumseh or Walbro) |
| Cooling system | Forced-air |
| Ignition system | Solid-state ignition system (CDI) |
| Lubricating system | Splash type |
| Starting system | Recoil or electric starter |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
Tightening torque specs
| Cylinder head bolt | 20.3-27.1 Nm; 2.07-2.76 kg·m; 15-20 ft·lb |
| Flywheel nut | 67.8-74.6 Nm; 6.9-7.6 kg·m; 50-55 ft·lb |
| Spark plug | 25-30 Nm; 2.55-3.06 kg·m; 18-22 ft·lb |
Cylinder Head
| Valve Arrangement: | L-head (sidevalve) | |
| Valves: | 2 | |
| Valve spring free length: | 47.879 mm (1.885 in) | |
| Camshaft lobe diameter: | 33.134-33.236 mm (1.3045-1.3085 in) | |
Cylinder block
| Bore x Stroke | 84.1 X 69.8 mm (3.31 x 2.75 in) | |
| Sleeve internal diameter | 84.125-84.150 mm (3.312-3.313 in) | |
| Piston skirt outer diameter | 84.023-84.074 mm (3.308-3.31 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring end gap | Top | 0.178-0.508 mm (0.007-0.02 in) |
| Second | 0.178-0.508 mm (0.007-0.02 in) | |
| Piston pin outer diameter | 17.457-17.463 mm (0.6873-0.6875 in) | |
Service Information
| Valve clearance | |
| Intake valve clearance | 0.254 mm (0.010 in) |
| Exhaust valve clearance | 0.508 mm (0.020 in) |
| Oil system | |
| Oil type | API SF, SJ |
| Recommended oil | SAE 30, 10-W30 |
| Oil capacity | 1.4 liters (1.5 US.qts, 1.23 Imp. qts) |
| Ignition system | |
| Spark plug | Champion J-8 |
| Spark plug gap | 0.763 mm (0.03 in) |
| Fuel system | |
| Type | Carburetor (Tecumseh or Walbro) |
| Main adjustment screw | Tecumseh: 1-3/4 turns Walbro: 1-1/2 turns off seat |
| Idle adjustment screw | Tecumseh: 1-1/4 turns Walbro: 1-1/4 turns off seat |
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Final Words
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