| Toyota HD engine | |
| Manufacturer: | Toyota Motor Company |
| Configuration: | Straight-6 |
| Valvetrain: | SOHC 12 & 24 valves |
| Turbocharger: | Yes, with intercooler (some versions) |
| Fueltype: | Diesel |
| Fuelsystem: | Direct injection |
| Coolingsystem: | Water-cooled |
| Displacement: | 4164cc |
| Bore: | 94mm |
| Stroke: | 100mm |
| Compression: | 18.6:1, 18.8:1 |
| Redline: | 4200 |
| Power: | NaN0NaN0 |
| Torque: | NaN0NaN0 |
The Toyota HD is a series of Diesel engines produced by Toyota.
The 1HD-T is a 12 valve 4164cc straight-6 SOHC turbocharged direct injection diesel engine .[1] Bore and stroke is NaNmm, with a compression ratio of 18.6:1. Output is 1640NaN0 at 3,600 rpm with 3610NaN0 of torque at 1,400 rpm.
The 1HD-FT is a 4164cc straight-6 24 valve SOHC turbocharged direct injection diesel engine . Bore and stroke is NaNmm, with a compression ratio of 18.6:1. Known as the "multivalve" it has 4 valves per cylinder (2 inlet, 2 exhaust), central vertically mounted injector, and no glow plugs but rather an intake glow screen heater (like the later electronic 1HD-FTE below). The 4 valves per cylinder are actuated by the SOHC, by using bridges so each rocker actuates a pair of valves. Output is 1680NaN0 ECE at 3,600 rpm with 3800NaN0 of torque ECE at 2,500 rpm. However, marinized version of 1HD (sold as Yamaha ME and Yanmar 6LP) have an output of 3150NaN0 on Yanmar 6LP and 3150NaN0, 3700NaN0 or 4200NaN0 on Yamaha ME.[2] [3] [4] [5]
The 1HD-FTE is a 4164cc straight-6 24 valve turbocharged diesel engine. Bore and stroke is NaNmm, with a compression ratio of 18.8:1. Output is 1670NaN0 at 3,400 rpm with 3800NaN0 of torque at 1,400 rpm. The fuel system is direct injection, and adopts the electronic fuel injection (EFI) system. Redline of this engine is at 4200 rpm.
The 4 valves per cylinder are actuated by the SOHC, by using bridges so each rocker actuates a pair of valves.
The version with intercooler as fitted to HDJ100 station wagons has 2020NaN0 at 3400 rpm with 4300NaN0 of torque at 1200-3200 rpm with a redline reaching 4200 rpm. A lower output 1220NaN0 non-intercooled version powers HDJ78 Troop Carrier and HDJ79 Utility versions.
Also some of the HDB50 and HDB51 Coasters are fitted with this 1HD-FTE engine.