Toyota HD engine

Last updated
Toyota HD engine
1989 Toyota 1HD-T Type engine front.jpg
1989 Toyota 1HD-T engine
Overview
Manufacturer Toyota
Layout
Configuration Straight-6
Displacement 4.2 L (4,164 cc)
Cylinder bore 94 mm (3.70 in)
Piston stroke 100 mm (3.94 in)
Valvetrain SOHC, 12 & 24 valves
Compression ratio 18.6:1, 18.8:1
RPM range
Max. engine speed 4200 rpm
Combustion
Turbocharger Yes, with intercooler (some versions)[ which? ]
Fuel system Direct injection
Fuel type Diesel
Cooling system Water-cooled
Output
Power output 122–313 kW (164–420 hp; 166–426 PS)
Torque output 361–430 N⋅m (266–317 lb⋅ft)
Chronology
Predecessor 12H-T
Successor 1VD-FTV (V8)

The Toyota HD is a series of diesel engines produced by Toyota.

Contents

1HD-T

The 1HD-T is a 12-valve 4.2 L (4,164 cc) straight-6 SOHC turbocharged direct injection diesel engine. [1] Bore and stroke is 94 mm × 100 mm (3.70 in × 3.94 in), with a compression ratio of 18.6:1. Output is 122 kW (164 hp; 166 PS) at 3,600 rpm with 361 N⋅m (266 lb⋅ft) of torque at 1,400 rpm.

1HD-FT

The 1HD-FT is a 4.2 L (4,164 cc) straight-6 24-valve SOHC turbocharged direct injection diesel engine. Bore and stroke is 94 mm × 100 mm (3.70 in × 3.94 in), 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 125 kW (168 hp; 170 PS) ECE at 3,600 rpm with 380 N⋅m (280 lb⋅ft) of torque ECE at 2,500 rpm. However, marinized version of 1HD (sold as Yamaha ME and Yanmar 6LP) have an output of 235 kW (315 hp; 319 PS) on Yanmar 6LP and 235 kW (315 hp; 319 PS), 276 kW (370 hp; 375 PS) or 313 kW (420 hp; 426 PS) on Yamaha ME. [2] [3] [4] [5]

1HD-FTE

The 1HD-FTE is a 4.2 L (4,164 cc) straight-6 24-valve SOHC turbocharged diesel engine. The four valves per cylinder are actuated by the SOHC by using bridges where each rocker actuates a pair of valves. Bore and stroke is 94 mm × 100 mm (3.70 in × 3.94 in), with a compression ratio of 18.8:1. For non-intercooled versions, output was advertised as 125 kW (167 hp; 169 PS) at 3,400 rpm with 380 N⋅m (280 lb⋅ft) of torque at 1,400 rpm, and intercooled versions were advertised as having 151 kW (202 hp; 205 PS) at 3400 rpm with 430 N⋅m (317 lb⋅ft) of torque at 1200-3200 rpm. The fuel system is direct injection and adopts 120 MPa (17,405 psi) electronic fuel injection (EFI), [6] in contrast to previous versions. The redline of this engine is 4200 rpm.

Intercooled versions were fitted in Toyota Land Cruiser 100 series, while non-intercooled versions were fitted in Toyota Land Cruiser 70 series. Some Toyota Coasters were fitted with this engine as well.

The engine was marketed under the Light-weight Advanced Super Response Engines (LASRE) moniker in marketing material.

References

  1. ↑ 1HZ, 1HD-T Engine repair manual (NCF064E ed.). Toyota Motor Company. Feb 1990. p. 14.
  2. ↑ "Help me cross reference my 1HD-T/Yanmar 6LPA-DTP". IH8MUD Forum. 20 December 2012. Retrieved 28 April 2022.
  3. ↑ "Yamaha Inboard Diesel-6Cyl 315hp". rib.net. Retrieved 10 July 2025.
  4. ↑ "Yanmar 6LP STZE". rib.net. Retrieved 28 April 2022.
  5. ↑ "Yamaha ME420 engines". YBW Forum. 3 September 2008. Retrieved 28 April 2022.
  6. ↑ "TOYOTA MOTOR CORPORATION GLOBAL WEBSITE | 75 Years of TOYOTA | Technical Development | Engines". www.toyota-global.com. Retrieved 2025-11-04.
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