Toyota HD engine

A 1989 Toyota 1HD-T engine.

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

1HD-T

The 1HD-T is a 4.2 L (4164 cc) straight-6 SOHC turbocharged diesel engine of direct injection design.[1] Bore is 94 mm and stroke is 100 mm, with a compression ratio of 18.6:1. Output is 164 hp (121 kW) at 3600 rpm with 267 lb·ft (361 N·m) of torque at 1400 rpm.

1HD-FT

The 1HD-FT is a 4.2 L (4164 cc) straight-6 24 valve SOHC turbocharged diesel engine of direct injection design. Bore is 94 mm and stroke is 100 mm, 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 168 hp (125 kW) ECE at 3600 rpm with 380 N·m of torque ECE at 2500 rpm.

1HD-FTE

The 1HD-FTE is a 4.2 L (4164 cc) straight-6 24 valve turbocharged diesel engine. Bore is 94 mm and stroke is 100 mm, with a compression ratio of 18.8:1. Output is 164 hp (122 kW) at 3400 rpm with 280 lb·ft (380 N·m) of torque at 1400 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 202 hp (151 kW) at 3400 rpm with 317.1 lb·ft (430 N·m) of torque at 1200-3200 rpm with a redline reaching 4000 rpm. A lower output 122 kW non-intercooled version powers HDJ78 Troop Carrier and HDJ79 Utility versions.

Also some of the HDB50 and HDB51 Toyota Coaster are fitted with this 1HD-FTE engine.

Applications

References

  1. ↑ 1HZ, 1HD-T Engine repair manual (NCF064E ed.). Toyota Motor Company. Feb 1990. p. 14.
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