Subaru-Robin EX27D

Subaru-Robin EX27DThe Subaru-Robin EX27D is a 265 cc (16.17 cu-in) single-cylinder air-cooled 4-stroke internal combustion small gasoline engine manufactured by Industrial Products division of Subaru Corporation for general-purpose applications.

The Subaru-Robin EX27D engine has an OHС (overhead camshaft) design; high compression ratio for better fuel efficiency; horizontal draft, float type carburetor; recoil starter or electric starter as option and transistorized magneto ignition system.

A 75.0 mm (2.95 in) cylinder bore and 60.0 mm (2.36 in) piston stroke give the motor a total 265 cc (16.17 cu-in) of displacement. Compression ratio rating is 8.3:1. The engine produced 9.0 PS (6.6 kW; 8.9 HP) at 4,000 rpm of maximum horsepower and 6.0 PS (4.4 kW; 5.9 HP) at 3,000 rpm or 6.9 PS (5.1 kW; 6.8 HP) at 3,600 rpm of continuous output power. Maximum torque is 18.6 N·m (1.9 kg·m, 13.7 ft·lb) at 2,500 rpm.

General information

Engine Specifications
ModelEX27D
Type4-stroke, OHC, single cylinder
Displacement265 cm 3 (16.17 cu-in)
Max. horsepower9.0 PS (6.6 kW; 8.9 HP) at 4,000 rpm
Max. torque (crank PTO)18.6 N·m (1.9 kg·m, 13.7 ft·lb) at 2,500 rpm
CarburetorHorizontal draft, float type carburetor
Cooling systemForced-air
Ignition systemTransistorized magneto ignition
Lubricating systemSplash
Starting systemRecoil or electric starter
Stoping systemIgnition primary circuit ground
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity6.1 L (1.61 US. gal. 1.34 Imp. gal.)
Fuel consumption367 g/kWH
PTO shaft rotationCounterclockwise (from PTO shaft side)

Cylinder Block and Head

The EX27D has cast iron cylinder sleeve, ball bearing supported forged steel crankshaft, improved piston design. The piston has two compression rings and one oil ring.

Cylinder block
Compression ratio:8.3:1
Bore x Stroke75.0 x 60.0 mm (2.95 x 2.36 in)
Sleeve internal diameter75.000-75.019 mm (2.9528-2.9535 in)
Piston skirt outer diameter74.980-75.000 mm (2.952-2.9528 in)
Number of piston rings (compression / oil):2 / 1
Ring side clearanceTop0.035-0.080 mm (0.0014-0.0031 in))
Second0.035-0.080 mm (0.0014-0.0031 in)
Oil0.010-0.065 mm (0.0004-0.0026 in)
Ring end gapTop0.10-0.30 mm (0.0039-0.0118 in)
Second0.20-0.40 mm (0.0079-0.0157 in)
Oil0.10-0.30 mm (0.0039-0.0118 in)
Connecting rod small end ID18.010-18.020 mm (0.7091-0.7094 in)
Connecting rod big end ID34.500-34.516 mm (1.3583-1.3589 in)
Piston pin outer diameter17.992-18.000 mm (0.7083-0.7087 in)
Crankshaft crankpin outer diameter34.467-34.480 mm (1.357-1.3575 in)
Crankshaft main journal diameter29.998-29.997 mm (1.181-1.181 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)
EXHAUST5.425-5.445 mm (0.2136-0.2144 in)
Valve spring free length:27.4 mm (1.0787 in)
Camshaft lobe height:INTAKE29.028-29.128 mm (1.1428-1.1468 in)
EXHAUST29.028-29.128 mm (1.1428-1.1468 in)

Tightening torque specs

Tightening torque specs
Cylinder head M8 × 68 flange bolt (Re-use)25-27 Nm; 2.5-2.7 kg·m; 18.1-19.5 ft·lb
Cylinder head M8 × 68 flange bolt (New)28-30 Nm; 2.8-3.0 kg·m; 20.3-21.7 ft·lb
Cylinder head M8 × 35 flange bolt17-19 Nm; 1.7-1.9 kg·m; 12.3-13.7 ft·lb
Connecting rod bolt17-20 Nm; 1.7-2.0 kg·m; 12.3-14.5 ft·lb
Main bearing cover bolts22-24 Nm; 2.2-2.4 kg·m; 16.2-17.7 ft·lb
Flywheel nut59-64 Nm; 5.9-6.4 kg·m; 42.7-46.3 ft·lb

Service Information

Engine
Cylinder compression3.5 kg/cm2
Valve clearance
Intake valve clearance0.12-0.15 mm (0.0047-0.0059 in)
Exhaust valve clearance0.12-0.15 mm (0.0047-0.0059 in)
Oil system
Oil type4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30
Oil capacity1.0 L (1.06 US. qt, 0.88 Imp. qt.)
Ignition system
Spark plug NGK: BR-6HS;
CHAMPION: RL86C
Spark plug gap0.6-0.7 mm (0.0236-0.0276 in)
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