The Subaru-Robin EA175V is a 174 cc (10.62 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with vertical shaft manufactured by Industrial Products division of Subaru Corporation under the Subaru Industrial Power Products brand name (other names: Robin, Subaru-Robin and Wisconsin Robin).
The Subaru-Robin EA175V engine has an OHC (overhead camshaft) system with chain drive for optimized engine size and durability; hemispherical head with angled intake/exhaust valves; cast-iron cylinder line; float type carburetor; capacitance discharge type ignition system.
The cylinder bore is 68.0 mm (2.67 in) and the piston stroke is 48.0 mm (1.89 in), compression ratio rating is 9.0:1. The engine produced 4.5 HP (3.4 kW) at 3,600 rpm of maximum horsepower and 4.O HP (3.0 KW) at 3,400 rpm of continuous power. Maximum torque is 10.0 N·m (1.02 kg·m, 7.38 ft·lb) at 2,500 rpm.
General information
| Engine Specifications | |
| Model | EA175V |
| Type | 4-stroke, OHC, single cylinder |
| Displacement | 174 cm 3 (10.6 cu-in) |
| Max. horsepower | 4.5 HP (3.4 kW) at 3,600 rpm |
| Max. torque (crank PTO) | 10.0 N·m (1.02 kg·m, 7.38 ft·lb) at 2,400 rpm |
| Carburetor | Float type |
| Cooling system | Forced-air |
| Ignition system | Сapacitance discharge type |
| Lubricating system | Mechanical splashing |
| Starting system | Recoil |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 1.2 L |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Subaru-Robin EA175V | |
| Length, mm (in) | 397 (15.6) |
| Width, mm (in) | 360 (14.2) |
| Height, mm (in) | 268 (10.6) |
| Dry weight, kg (lb) | 13.0 (28.7) |
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 9.0:1 | |
| Bore x Stroke | 68.0 mm X 48.0 mm (2.68 x 1.89 in) | |
| Sleeve internal diameter | 68.000-68.020 mm (2.6772-2.6779 in) | |
| Piston skirt outer diameter | 67.989-67.971 mm (2.6767-2.676 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top/second | 0.04-0.08 mm (0.0016-0.0031 in) |
| Ring end gap | Top | 0.13-0.28 mm (0.0051-0.011 in) |
| Second | 0.20-0.40 mm (0.0079-0.0157 in) | |
| Ring width | Top | 2.50-2.70 mm (0.0984-0.1063 in) |
| Second | 2.60-2.80 mm (0.1024-0.1102 in) | |
| Connecting rod small end ID | 16.005-16.021 mm (0.6301-0.6307 in) | |
| Connecting rod big end ID | 30.000-30.018 mm (1.1811-1.1818 in) | |
| Crankpin outer diameter | 29.969-29.981 mm (1.1799-1.1804 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHC | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 5.440-5.455 mm (0.2142-0.2148 in) |
| EXHAUST | 5.440-5.455 mm (0.2142-0.2148 in) | |
| Spring free length | 30.50 mm (1.2008 in) | |
Tightening torque specs
| Tightening torque specs | |
| Connecting rod bolt | 13 Nm; 1.3 kg·m; 9.0 ft·lb |
| Cylinder head cover bolt | 26 Nm; 2.6 kg·m; 18 ft·lb |
| Crankcase cover bolt | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Flywheel nut | 52 Nm; 5.3 kg·m; 38 ft·lb |
| Value locking nut | 6 Nm (0.61 kg·m; 4.43 ft·lb) |
Service Information
| Valve clearance | |
| Intake valve | 0.10-0.15 mm (0.0039-0.0059 in) |
| Exhaust valve | 0.15-0.20 mm (0.0059-0.0079 in) |
| Oil system | |
| Oil type | 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30, 10W-40 |
| Oil capacity | 0.6 L (0.63 US. qt) |
| Ignition system | |
| Spark plug |
NGK: BPR6HS or BPR7HS CHAMPION: RL82YC or RL87YC TORCH: E7RTC or E6RTC |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Spark plug tightening torque | 20 N·m (2.0 kg·m, 14 ft·lb) |
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