Subaru-Robin EA190V

Subaru-Robin EA190V engineThe Subaru-Robin EA190V is a 0.2 L (189 cc, 11.53 cu·in) natural aspirated single-cylinder four-stroke air-cooled internal combustion small gasoline engine with a vertical shaft, manufactured by the Industrial Products division of Subaru Corporation to 2017 for general-purpose applications.

The EA190V engine was produced until 2017 under the brand Subaru Industrial Power Products, which was previously referred to as Robin, Subaru-Robin and Wisconsin Robin. This engine used for lawn mowers and garden applications including pressure washers, walk behind string trimmers, aerators and lawn vacs.

The Subaru-Robin EA190V engine has a single cylinder, overhead camshaft (OHC) design, vertical shaft, and recoil starter. This engine used float type carburetor, capacitance discharge type ignition system, centrifugal flyweight type governor, mechanical splash type lubricating system and forced-air cooling system. The engine is fitted with a foam air cleaner (paper air cleaner was available as an option). The Subaru-Robin EA190V is equipped with 0.6 L (0.16 US. gal. 0.13 Imp. gal.) fuel tank.

The EA190V engine produced 5.6 PS (4.1 kW; 5.5 HP) at 3,600 rpm of maximum horsepower and 11.2 N·m (1.1 kg·m, 8.3 ft·lb) at 2,500 rpm of maximum torque.

General information

Engine Specifications
Engine model EA190V
Engine type 4-stroke, OHV, single-cylinder
Displacement 189 cm3, (11.53 cu·in)
Max. horsepower 5.6 PS (4.1 kW; 5.5 HP) at 3,600 rpm
Max. torque 11.2 N·m (1.1 kg·m, 8.3 ft·lb) at 2,500 rpm
Cooling system Forced air
Air cleaner Foam (Optional Paper)
Lubricating system Splash type
Ignition system Capacitance discharge type
Fuel system Float type carburetor
Fuel consumption 395 g/kWh
Fuel tank capacity 1.0 L (0.26 US. gal. 0.22 Imp. gal.)
Fuel used Unleaded gasoline (octane number 86 or higher)
Starting system Recoil starter
Stoping system Ignition primary circuit ground
Governor Centrifugal flyweight type
PTO shaft rotation Counterclockwise view from P.T.O. side
Dimensions (L x W X H) 425 x 360 x 290 mm (16.7 x 14.2 x 11.4 in)
Dry weight 14.0 kg (30.9 lbs)

Cylinder Block and Head

A 68.0 mm (2.68 in) cylinder bore and 52.0 mm (2.05 in) piston stroke give the EA190V engine a total of 189 cc of displacement. Compression ratio rating is 9.0:1. The Subaru-Robin EA190V used a cast-iron cylinder liner with heavy-duty piston rings, forged high-carbon steel crankshaft with ball bearing supporting system and hardened steel rocker arms with precision tappet adjusters. The piston is fitted with two compression rings and a single oil ring.

Cylinder block
Compression ratio: 9.0:1
Cylinder bore: 68.0 mm (2.68 in)
Piston stroke: 52.0 mm (2.05 in)
Cylinder internal diameter (standard): 68.000-68.020 mm (2.6772-2.6779 in)
Piston skirt outer diameter (standard): 67.971-67.989 mm (2.676-2.6767 in)
Number of piston rings (compression / oil): 2/1
Connecting rod big end diameter (standard): 30.000-30.018 mm (1.1811-1.1818 in)
Connecting rod small end diameter (standard): 16.005-16.021 mm (0.6301-0.6307 in)
Piston pin diameter: 13.994-14.000 mm (0.5509-0.5512 in)
Top ring side clearance: 0.04-0.08 mm (0.0016-0.0031 in)
Second ring side clearance: 0.04-0.08 mm (0.0016-0.0031 in)
Top ring end gap: 0.13-0.28 mm (0.0051-0.011 in)
Second ring end gap: 0.20-0.40 mm (0.0079-0.0157 in)
Top ring width: 2.50-2.70 mm (0.0984-0.1063 in)
Second ring width: 2.70-2.90 mm (0.1063-0.1142 in)
Crankpin journal diameter: 29.969-29.981 mm (1.1799-1.1804 in)
Crankshaft center distance: 26 mm (1.025 in)
Cylinder head
Valve arrangement: OHV, chain driven
Valves:: 2
Intake valve steam diameter: 5.440-5.455 mm (0.2142-0.2148 in)
Exhaust valve steam diameter: 5.430-5.445 mm (0.2138-0.2144 in)
Intake valve spring free length: 30.50 mm (1.2008 in)
Exhaust valve spring free length: 30.50 mm (1.2008 in)
Intake camshaft lobe height: 23.98 mm (0.9441 in)
Exhaust camshaft lobe height: 27.88 mm (1.0976 in)
Camshaft journal diameter : 9.000-9.040 mm (0.3543-0.3559 in)

Service Data

The API service classification SE engine oil with a viscosity of 5W-30, 10W-30 is recommended for the EA190V, refilling oil capacity is 0.6 L (0.63 US. qt, 0.53 Imp. qt.). Recommended spark plug is NGK: BPR7HS, CHAMPION: RL87YC, TORCH: E7RTC with 0.6-0.7 mm (0.0236-0.0236 in) spark plug gap.

The valve clearance is 0.10-0.15 mm (0.0039-0.0059 in) for intake valves and 0.15-0.20 mm (0.0059-0.0079 in) for exhaust valves. Standard cylinder compression is 1.15 MPa at 1200 rpm.

Engine
Maximum speed: 3,800±100 rpm
Cylinder compression: 1.15 MPa at 1200 rpm
Valve clearance
Intake valve clearance: 0.10-0.15 mm (0.0039-0.0059 in)
Exhaust valve clearance: 0.15-0.20 mm (0.0059-0.0079 in)
Oil system
Lubrication system: Splash type
Oil type: 5W-30, 10W-30
Recommended oil: 4-stroke engine oil, API service classification SE
Oil capacity: 0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Fuel system
Type: Float type carburetor
Ignition system
Type: Capacitance discharge type
Spark plug: NGK: BPR7HS
CHAMPION: RL87YC
TORCH: E7RTC
Spark plug gap: 0.6-0.7 mm (0.0236-0.0236 in)
Spark plug torque: 22 N·m (2.2 kg·m, 16.2 ft·lb)

Tightening torque

Engine
Connecting rod bolt 13 Nm; 1.33 kg·m; 9.59 ft·lb
Cylinder head bolt 28 Nm; 2.86 kg·m; 20.66 ft·lb
Flywheel nut 64 Nm; 6.53 kg·m; 47.23 ft·lb
Crankcase cover bolt 10 Nm; 1.02 kg·m; 7.38 ft·lb
Value locking nut 8 Nm; 0.82 kg·m; 5.9 ft·lb
Oil drain bolt 22 Nm; 2.24 kg·m; 16.24 ft·lb

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