Description
The Toyota 14B is a 3.7-liter, 4-cylinder, naturally aspirated direct-injection diesel engine from Toyota’s B-series of commercial-duty diesel engines. It was developed primarily for Toyota Dyna/Toyoace trucks, Coaster buses and other heavy-duty applications.
Toyota’s service documentation identifies the 14B as a 4-cylinder inline, 8-valve OHV engine with gear-driven valve timing, direct injection and a distributor-type injection pump.
The 14B is a heavy-duty Toyota diesel designed for commercial vehicles rather than passenger cars.
Its design emphasizes:
- Durability
- Low-speed torque
- Mechanical simplicity
- Easy servicing
- Long operating life
- Reliability under heavy loads
It is a naturally aspirated engine, meaning it does not use a turbocharger.
The related 14B-T is the turbocharged version; the standard 14B is non-turbo.
| Specification | 14B | 14B-T |
|---|---|---|
| Displacement | 3,661 cc | 3,661 cc |
| Cylinders | Inline 4 | Inline 4 |
| Valves | 8 | 8 |
| Fuel system | Direct injection | Direct injection |
| Aspiration | Naturally aspirated | Turbocharged |
| Intercooler | No | Application dependent |
| Compression | 18.0:1 | Lower than NA version |
| Timing | Gear drive | Gear drive |
| Typical power | ~88–98 hp | ~140 PS |
| Typical torque | ~231–240 Nm | ~333 Nm |
TOYOTA 14B 3.7L DIESEL ENGINE
Engine code: 14B
Engine family: Toyota B-series
Type: Naturally aspirated diesel
Configuration: Inline 4-cylinder
Displacement: 3,661 cc / 3.7L
Bore: 102.0 mm
Stroke: 112.0 mm
Valves: 8
Valves/cylinder: 2
Valvetrain: OHV
Valve drive: Gear driven
Combustion: Direct injection
Injection pump: Distribution/rotary type
Compression ratio: 18.0:1
Block: Cast iron
Cylinder head: Cast iron
Aspiration: Naturally aspirated
Turbocharger: No
Intercooler: No
Cooling: Liquid cooled
Firing order: 1-3-4-2
Typical Toyota Dyna output: 65 kW / 88.4 PS @ 3,400 rpm
Typical Toyota Dyna torque: 231 Nm @ 2,000 rpm
Other published output: approximately 98 hp / 72 kW, depending on specification
Idle speed: 650–750 rpm
Maximum speed: 4,050–4,250 rpm
Timing: Gear drive
Fuel: Diesel.
The 14B is not the same engine as the 14B-T. If you’re sourcing a replacement, match the engine to the Dyna/Coaster chassis code and year, because accessories, mounting arrangements, injection equipment and gearbox combinations can differ.
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