The Toyota HD is a series of

diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...

s produced by

Toyota is a Japanese Multinational corporation, multinational Automotive industry, automotive manufacturer headquartered in Toyota City, Aichi, Japan. It was founded by Kiichiro Toyoda and incorporated on August 28, 1937. Toyota is the List of manuf ...

1HD-T

The 1HD-T is a 12 valve

straight-6 A straight-six engine (also referred to as an inline-six engine; abbreviated I6 or L6) is a piston engine with six cylinders arranged in a straight line along the crankshaft. A straight-six engine has perfect primary and secondary engine balanc ...

SOHC An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combus ...

turbocharged In an internal combustion engine, a turbocharger (also known as a turbo or a turbosupercharger) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the ...

direct injection

. Bore and stroke is , with a

compression ratio The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine. A fundamental specification for such engines, it can be measured in two different ways. Th ...

of 18.6:1. Output is at 3,600 rpm with of torque at 1,400 rpm. * Coaster, HDB20, January 1990 January 1993 * Coaster, HDB30, January 1990 January 1993 * Coaster, HDB50, January 1993 January 1995 * Land Cruiser, HDJ80, January 1990 January 1995

1HD-FT

The 1HD-FT is a straight-6 24 valve SOHC turbocharged direct injection diesel engine. Bore and stroke is , 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 ECE at 3,600 rpm with of torque ECE at 2,500 rpm. However, marinized version of 1HD (sold as Yamaha ME and Yanmar 6LP) have an output of on Yanmar 6LP and , or on Yamaha ME. * Land Cruiser, HDJ80, 1995 * Coaster, HDB50, July 1995 July 1999 * Land Cruiser, HDJ80, July 1995 July 1999 *

Yanmar is a Japanese diesel engine, heavy machinery and agricultural machinery manufacturer founded in Osaka, Japan, in 1912. Yanmar manufactures and sells engines used in a wide range of applications, including seagoing vessels, pleasure boats, cons ...

6LP and Yamaha ME diesel engine (marinized version of 1HD-FT).

1HD-FTE

The 1HD-FTE is a straight-6 24 valve turbocharged diesel engine. Bore and stroke is , with a compression ratio of 18.8:1. Output is at 3,400 rpm with of torque at 1,400 rpm. The fuel system is direct injection, and adopts the

electronic fuel injection Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of a fuel injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All co ...

(EFI) system.

Redline The redline is the maximum engine speed at which an internal combustion engine or traction motor and its components are designed to operate without causing damage to the components themselves or other parts of the engine. The redline of an eng ...

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 An intercooler is a heat exchanger used to cool a gas after compression. Often found in turbocharged engines, intercoolers are also used in air compressors, air conditioners, refrigeration and gas turbines. Internal combustion engines Mo ...

as fitted to HDJ100 station wagons has at 3400 rpm with of torque at 1200-3200 rpm with a redline reaching 4200 rpm. A lower output 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.

References

External links

HD Diesel engines by model Straight-six engines {{Automotive-part-stub