Toyosha S126

Toyosha S126The Toyosha S126 is a 1.3 L (1,263 cc, 77.07 cu·in) natural aspirated two-cylinders four-stroke liquid-cooled internal combustion small diesel engine, manufactured by Japanese company Hinomoto under the Toyosha brand for general-purpose applications.

The Toyosha S126 engine has two cylinders, incorporate overhead valves, an indirect injection system, and an electric starter. The engine used a single-stage dry air cleaner, forced circulation liquid cooling system, and glow plugs for starting aid.

This engine produced 23.3 PS (17.2 kW; 23.0 HP) of maximum horsepower.

General information

Engine Specifications
Engine modelS126
Engine type4-stroke, OHV, two-cylinders
Displacement1,263 cm3, (77.07 cu·in)
Max. horsepower23.3 PS (17.2 kW; 23.0 HP)
Max. torque
Cooling systemLiquid-cooled
Air cleanerSingle stage, dry element
Lubricating systemForced splash
Fuel systemInderect injection (Kiki injection pump)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Starting systemElectric starter (Hitachi S12-61)
Charging systemAlterator (Hitachi L115-5B)

Cylinder Block and Head

Cylinder bore and piston stroke are 92.0 mm (3.62 in) and 95.0 mm (3.74 in), respectively. Compression ratio rating is 23:1. The cylinder head is a one-piece alloy cast-iron casting as is the engine block and no cylinder sleeves are used. The pistons are aluminum alloy casting. The crankshaft is supported by three main bearings. Grow plugs located in the precombustion swirl chambers of the head provide aid for cold starting.

Cylinder block
Compression ratio:23:1
Cylinder bore:92.0 mm (3.62 in)
Piston stroke:95.0 mm (3.74 in)
Number of piston rings (compression / oil):2/1
Number of main bearings:3
Crankshaft center distance:47.5 mm (1.87 in)
Cylinder head
Valve arrangement:OHV
Valves:2 per cylinder (4 valves in total)

Tightening torque

Tightening torque settings
Cylinder head bolt torque:88-108 Nm; 8.8-10.8 kg·m; 65-80 lb·ft
Connecting rod cap torque:59-67 Nm; 5.9-6.7 kg·m; 43-50 lb·ft
Main bearing cap bolt:59-78 Nm; 5.9-7.8 kg·m; 43-57 lb·ft

Service Data

The diesel oil (API Service Classification CC or CD) with a viscosity of SAE 10W-30 is recommended for the S126, refilling oil capacity is 3.7 L (3.91 US. qt, 3.26 Imp. qt.). The valve clearance is 0.30 mm (0.0118 in) for intake valves and 0.35 mm (0.0138 in) for exhaust valves.

Valve clearance
Intake valve clearance:0.30 mm (0.0118 in)
Exhaust valve clearance:0.35 mm (0.0138 in)
Oil system
Lubrication system:Forced splash
Oil type:Diesel oil (API Service Classification CC or CD)
Recommended oil:SAE 10W-30
Oil capacity:3.7 L (3.91 US. qt, 3.26 Imp. qt.)
Fuel system
Type:Inderect injection
Pump type:Kiki NP-PE
Injestion timing:20° BTDC
Fuel nozzle opening pressure:11,800-12,700 kPa (1,700-1,840 PSI)


ModelYears Produced
Allis Chalmers 50201977-1985
Simplicity 95231978-1983
Massey Ferguson 2101978-1984
Massey Ferguson 210-41978-1984
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.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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