The Tecumseh HH100 is a 389 cc, (23.7 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a horizontal shaft, manufactured by TecumsehPower Company, for general-purpose applications.
An 84.1 mm (3.31 in) cylinder bore and 69.8 mm (2.75 in) piston stroke give the HH100 engine a total of 389 cc of displacement. This engine produced 10.2 PS (7.5 kW; 10.0 HP) of horsepower.
The Tecumseh HH100 features:
- Cast-iron cylinder block and cast-iron cylinder head
- L-head (side-valve) design
- Solid state ignition system (CDI)
- Carburetor (Tecumseh or Walbro)
- Centrifugal governor
- Splash type lubrication system
- Forced air cooling system
- Electric starter
General information
| Engine Specifications | |
| Engine model | HH100 |
| Engine 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 | – |
| Cooling system | Forced air |
| Lubricating system | Splash |
| Ignition system | Solid state ignition system (CDI) |
| Fuel system | Carburetor (Tecumseh or Walbro) |
| Starting system | Electric starter |
| Governor | Centrifugal governor |
| Dimensions (L x W X H) | – |
| Dry weight | – |
Cylinder Block and Head
| Cylinder block | |
| Cylinder bore: | 84.1 mm (3.31 in) |
| Piston stroke: | 69.8 mm (2.75 in) |
| Cylinder internal diameter (standard): | 84.125-84.150 mm (3.312-3.313 in) |
| Piston skirt outer diameter (standard): | 84.023-84.074 mm (3.308-3.31 in) |
| Number of piston rings (compression / oil): | 2/1 |
| Piston pin diameter: | 17.457-17.463 mm (0.6873-0.6875 in) |
| Side clearance (Top): | 0.051-0.889 mm (0.002-0.035 in) |
| Side clearance (Second): | 0.051-0.889 mm (0.002-0.035 in) |
| Ring end gap (Top): | 0.178-0.508 mm (0.007-0.02 in) |
| Ring end gap (Second): | 0.178-0.508 mm (0.007-0.02 in) |
| Crankpin journal diameter: | 34.925-34.938 mm (1.375-1.3755 in) |
| Crankshaft center distance: | 34.9 mm (1.375 in) |
| Cylinder head | |
| Valve arrangement: | L-head (side valve) |
| Valves: | 2 |
| Valve spring free length (INTAKE): | 47.879 mm (1.885 in) |
| Valve spring free length (EXHAUST): | 47.879 mm (1.885 in) |
| Camshaft lobe height (INTAKE): | 33.134-33.236 mm (1.3045-1.3085 in) |
| Camshaft lobe height (EXHAUST): | 33.134-33.236 mm (1.3045-1.3085 in) |
Service Data
| Valve clearance | |
| Intake valve clearance: | 0.254 mm (0.01 in) |
| Exhaust valve clearance: | 0.508 mm (0.02 in) |
| Oil system | |
| Lubrication system: | Splash |
| Oil type: | API service SF or SJ |
| Recommended oil: | SAE 10-W30 |
| Oil capacity: | 1.56 L (1.65 US. qt, 1.37 Imp. qt.) |
| 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 |
| Ignition system | |
| Type: | Solid state ignition system (CDI) |
| Spark plug: | Champion J-8 |
| Spark plug gap: | 0.763 mm (0.03 in) |
| Spark plug torque: | 30 N·m (3.1 kg·m, 22.1 ft·lb) |
| Magneto air gap | 0.152-0.254 mm (0.006-0.010 in) |
Tightening torque
| Tightening torque specs | |
| Cylinder head bolts | 20.3-27.1 Nm (15.0-20.1 ft-lbs) |
| Connecting rod lock nuts | 9.7-12.4 Nm (7.2-9.2 ft-lbs) |
| Mounting flange or cylinder cover | 11.3-14.7 Nm (8.4-10.9 ft-lbs) |
| Flywheel nut | 67.8-74.6 Nm (50.2-55.3 ft-lbs) |
| Spark plug | 24.9-31.6 Nm (18.4-23.4 ft-lbs) |
| Carburetor to cylinder | (8.1-10.9 Nm (6.0-8.1 ft-lbs) |
| Air cleaner to elbow | 1.7-2.8 Nm (1.3-2.1 ft-lbs) |
| Air cleaner bracket to carburetor | 1.7-2.8 Nm (1.3-2.1 ft-lbs) |
| Tank bracket to housing | 4-5.7.0 Nm (3.0-4.2 ft-lbs) |
| Tank bracket to cylinder (5/16’’lower) | 17.0-22.6 Nm (12.6-16.7 ft-lbs) |
| Tank bracket to head bolt | 17.0-22.6 Nm (12.6-16.7 ft-lbs) |
| Starter-Top mount recoil | 4.5-6.8 Nm (3.3-5.0 ft-lbs) |
| Belt guard to blower housing | 2.8-4.0 Nm (2.1-3.0 ft-lbs) |
| Flywheel screen and pulley | 8.1-10.9 Nm (6.0-8.1 ft-lbs) |
| Stationary point screw | 1.7-2.3 Nm (1.3-1.7 ft-lbs) |
| Blower housing baffle to cylinder | 8.1-10.9 Nm (6.0-8.1 ft-lbs) |
| Blower housing to baffle or cylinder | 5.4-8.1 Nm (4.0-6.0 ft-lbs) |
| Breaker point cover | 1.7-2.8 Nm (1.3-2.1 ft-lbs) |
| Magneto stator mounting | 8.1-10.9 Nm (6.0-8.1 ft-lbs) |
| Breather to cylinder | 2.3-2.8 Nm (1.7-2.1 ft-lbs) |
| Oil drain plug 3/8-18 | 9.0-11.3 Nm (6.7-8.3 ft-lbs) |
| Blower housing extension to cylinder | 8.1-10.9 Nm (6.0-8.1 ft-lbs) |
| Stub shaft bolts to flywheel | 11.3-14.1 Nm (8.4-10.4 ft-lbs) |
| Motor generator all mounting bolts | 7.4-11.3 Nm (5.5-8.4 ft-lbs) |
Applications
| Manufacturer or Brand | Models |
| Lawn tractors | |
| John Deere | 112 |
| Wheel Horse | Raider 10 |
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