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
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
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)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

Be the first to comment

Leave a Reply

Your email address will not be published.