The Toyota HD is a series of Diesel engines produced by Toyota.
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The 1HD-T is a 4.2 L (4164 cc) straight-6 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. Output is 162 hp (121 kW) at 3600 rpm with 267 ft·lbf (361 N·m) of torque at 1400 rpm.
The 1HD-FTE is a 4.2 L (4164 cc) straight-6 24 valve SOHC (single overhead camshaft) 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 ft·lbf (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 196 hp (144 kW) at 3400 rpm with 317.1 ft·lbf (430 N·m) of torque at 1200-3200 rpm with a redline reaching 4000 rpm. A lower output 122kW non-intercooled version powers HDJ78 Troop Carrier and HDJ79 Utility versions.