The Toyosha S126 is a 1.3 l (1,263 cc, 77.07 cu-in) two-cylinder liquid-cooled 4-stroke internal combustion diesel engine, manufactured by Japanese company Hinomoto under the Toyosha brand.
This engine has two cylinders, overhead valves (2 per cylinder), three main bearings, flyweight governor and Kiki fuel injection pump. The S126 engine uses Hitachi S12-61 electric starter, Hitachi L115-5B (12V-15A) alternator and Hitachi TRIZ-34 voltage regulator.
A 92 mm (3.62 in) cylinder bore and 95 mm (3.74 in) piston stroke give the motor a total of 1,263 cc, (77.07 cu-in) of displacement. Compression ratio rating is 23:1. The Toyosha S126 engine produced 23.0 HP (17.1 kW) of maximum output.
General information
| Engine Specifications | |
| Model | S126 |
| Type | 4-stroke, OHV, two cylinders |
| Displacement | 1.3 L, 1,263 cm3 (77.1 cu-in) |
| Max. horsepower | 23.0 HP (17.1 kW) |
| Max. torque (crank PTO) | – |
| Cooling system | Liquid-cooled |
| Fuel injection pump | Kiki |
| Starting system | Hitachi S12-61 electric starter |
| Fuel used | Diesel fuel |
Service Information
| Engine | |
| Maximum speed | 2,600 ± 150 rpm |
| Idle speed | 750 ± 150 rpm |
| Valve clearance | |
| Intake valve | 0.30 mm (0.012) |
| Exhaust valve | 0.35 mm (0.014) |
| Oil system | |
| Oil type | Diesel oil (API Service Classification CC or CD) |
| Recommended oil | SAE 10W-30 |
| Oil capacity |
With filter change: 4.6 l (5.0 qt.) Without filter change: 4.0 l (4.2 qt.) |
| Electrical system | |
| Alterator | Hitachi L115-5B (12V-15A) |
| Voltage regulator | Hitachi TRIZ-34 |
| Starter | Hitachi S12-61 |
| Fuel system | |
| Fuel pump | Kiki NP-PE |
| Injection timing | 20° B.T.D.C. |
| Fuel nozzle pressure | 1710-1840 psi |
NOT complaining, just FYI: You have a typo under electrical; in place of “alternator” you have “Alter-ator.” The hyphen (-) indicates the missing letter “n”.
Thank you for providing all this information.
Great information!! I have a 1977 5020 with the S126 engine. It looks weathered but runs perfectly. I use it to run a 48” shredder. A great little tractor.
Does anyone know how to get a parts and repair manual for the Hinomoto E230 series tractor or manual for the S126 diesel engine?