Toyota HD engine

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

Toyota HD engine
1989 Toyota 1HD-T engine
Overview
Manufacturer	Toyota
Layout
Configuration	Straight-6
Displacement	4.2 L (4,164 cc)
Cylinder bore	94 mm (3.70 in)
Piston stroke	100 mm (3.94 in)
Valvetrain	SOHC, 12 & 24 valves
Compression ratio	18.6:1, 18.8:1
RPM range
Max. engine speed	4200 rpm
Combustion
Turbocharger	Yes, with intercooler (some versions)[which?]
Fuel system	Direct injection
Fuel type	Diesel
Cooling system	Water-cooled
Output
Power output	122–313 kW (164–420 hp; 166–426 PS)
Torque output	361–430 N⋅m (266–317 lb⋅ft)

1HD-T

The 1HD-T is a 12-valve 4.2 L (4,164 cc) straight-6 SOHC turbocharged direct injection diesel engine.^[1] Bore and stroke is 94 mm × 100 mm (3.70 in × 3.94 in), with a compression ratio of 18.6:1. Output is 122 kW (164 hp; 166 PS) at 3,600 rpm with 361 N⋅m (266 lb⋅ft) of torque at 1,400 rpm.

• Coaster, HDB20, January 1990 – January 1993^{[clarification needed]}
• 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 4.2 L (4,164 cc) straight-6 24-valve SOHC turbocharged direct injection diesel engine. Bore and stroke is 94 mm × 100 mm (3.70 in × 3.94 in), 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 125 kW (168 hp; 170 PS) ECE at 3,600 rpm with 380 N⋅m (280 lb⋅ft) of torque ECE at 2,500 rpm. However, marinized version of 1HD (sold as Yamaha ME and Yanmar 6LP) have an output of 235 kW (315 hp; 319 PS) on Yanmar 6LP and 235 kW (315 hp; 319 PS), 276 kW (370 hp; 375 PS) or 313 kW (420 hp; 426 PS) on Yamaha ME.^[2][3][4][5]

• Coaster, HDB50, July 1995 – July 1999
• Land Cruiser, HDJ80, July 1995 – July 1999
• Yanmar 6LP and Yamaha ME diesel engine (marinized version of 1HD-FT).

1HD-FTE

The 1HD-FTE is a 4.2 L (4,164 cc) 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 94 mm × 100 mm (3.70 in × 3.94 in), with a compression ratio of 18.8:1. For non-intercooled versions, output was advertised as 125 kW (167 hp; 169 PS) at 3,400 rpm with 380 N⋅m (280 lb⋅ft) of torque at 1,400 rpm, and intercooled versions were advertised as having 151 kW (202 hp; 205 PS) at 3400 rpm with 430 N⋅m (317 lb⋅ft) of torque at 1200-3200 rpm. The fuel system is direct injection and adopts 120 MPa (17,405 psi) electronic fuel injection (EFI),^[6] 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 (LASRE) moniker in marketing material.