Subaru-Robin EA175V

Subaru-Robin EA175VThe 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
ModelEA175V
Type4-stroke, OHC, single cylinder
Displacement174 cm 3 (10.6 cu-in)
Max. horsepower4.5 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
CarburetorFloat type
Cooling systemForced-air
Ignition systemСapacitance discharge type
Lubricating systemMechanical splashing
Starting systemRecoil
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity1.2 L
PTO shaft rotationCounterclockwise (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 Stroke68.0 mm X 48.0 mm (2.68 x 1.89 in)
Sleeve internal diameter68.000-68.020 mm (2.6772-2.6779 in)
Piston skirt outer diameter67.989-67.971 mm (2.6767-2.676 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop/second0.04-0.08 mm (0.0016-0.0031 in)
Ring end gapTop0.13-0.28 mm (0.0051-0.011 in)
Second0.20-0.40 mm (0.0079-0.0157 in)
Ring widthTop2.50-2.70 mm (0.0984-0.1063 in)
Second2.60-2.80 mm (0.1024-0.1102 in)
Connecting rod small end ID16.005-16.021 mm (0.6301-0.6307 in)
Connecting rod big end ID30.000-30.018 mm (1.1811-1.1818 in)
Crankpin outer diameter29.969-29.981 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):INTAKE5.440-5.455 mm (0.2142-0.2148 in)
EXHAUST5.440-5.455 mm (0.2142-0.2148 in)
Spring free length30.50 mm (1.2008 in)

Tightening torque specs

Tightening torque specs
Connecting rod bolt13 Nm; 1.3 kg·m; 9.0 ft·lb
Cylinder head cover bolt26 Nm; 2.6 kg·m; 18 ft·lb
Crankcase cover bolt10 Nm; 1.0 kg·m; 7 ft·lb
Flywheel nut52 Nm; 5.3 kg·m; 38 ft·lb
Value locking nut6 Nm (0.61 kg·m; 4.43 ft·lb)

Service Information

Valve clearance
Intake valve0.10-0.15 mm (0.0039-0.0059 in)
Exhaust valve0.15-0.20 mm (0.0059-0.0079 in)
Oil system
Oil type4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30, 10W-40
Oil capacity0.6 L (0.63 US. qt)
Ignition system
Spark plug NGK: BPR6HS or BPR7HS
CHAMPION: RL82YC or RL87YC
TORCH: E7RTC or E6RTC
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Spark plug tightening torque20 N·m (2.0 kg·m, 14 ft·lb)
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