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 direct injection diesel engine. 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.

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, 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. However, marinized version of 1HD have an output of on Yanmar 6LP and, or on Yamaha ME.

1HD-FTE

The 1HD-FTE is a 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, with a compression ratio of 18.8:1. For non-intercooled versions, output was advertised as at 3,400 rpm with of torque at 1,400 rpm, and intercooled versions were advertised as having at 3400 rpm with of torque at 1200-3200 rpm. The fuel system is direct injection and adopts electronic fuel injection, 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 moniker in marketing material.