Toyota HD engine


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

1HD-T

The 1HD-T is a 12 valve straight-6 SOHC turbocharged diesel engine of direct injection design. Bore and stroke is, with a compression ratio of 18.6:1. Output is at 3,600 rpm with of torque at 1,400 rpm.
The 1HD-FT is a straight-6 24 valve SOHC turbocharged diesel engine of direct injection design. Bore and stroke is, with a compression ratio of 18.6:1. Known as the "multivalve" it has 4 valves per cylinder, central vertically mounted injector, and no glow plugs but rather an intake glow screen heater. 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.
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 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 at 3400 rpm with of torque at 1200-3200 rpm with a redline reaching 4000 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.