Toyota HZ engine

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The Toyota 1HZ is a straight-six diesel engine developed and produced by Toyota Motor Corporation beginning in 1990. It continues to be offered in vehicles sold in countries with lax emissions regulations, and those sold by Toyota Gibraltar Stockholdings for organisations such as the United Nations.

Contents

Toyota HZ engine
TOYOTA 1HZ engine 01.jpg
A Toyota 1HZ engine installed in the Land Cruiser.
Overview
Manufacturer Toyota Motor Company
Production1990–present
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)
Cylinder block material Cast iron
Cylinder head material Cast iron
Valvetrain SOHC with 2 valves per cylinder
Valvetrain drive system Timing belt
Compression ratio 22.4:1
RPM range
Max. engine speed 4000
Combustion
Fuel system Mechanical fuel injection
Fuel type Diesel
Oil system Wet sump
Cooling system Water-cooled
Output
Power output 131  PS (129  hp; 96  kW)
Torque output 285  N⋅m (29  kg⋅m; 210  lb⋅ft)
Chronology
Predecessor Toyota H engine
Bottom view of the 1HZ head 1HZ-head.jpg
Bottom view of the 1HZ head
Bottom view of 1HZ/1HDT connecting rods and crank 1HZ-main-bearing-cap.jpg
Bottom view of 1HZ/1HDT connecting rods and crank
Front view of 1HZ/1HDT timing gears (1HZ uses a timing belt to drive the camshaft). 1HZ-timing-gears.jpg
Front view of 1HZ/1HDT timing gears (1HZ uses a timing belt to drive the camshaft).

The 1HZ generates more power and torque than the previous 2H diesel engine. Despite being 30 years old, the 1HZ still sees use in Landcruiser 70 Series production worldwide with the exception of petrol-only markets and Euro 4 and Australian markets, where the 1GR-FE and 1VD-FTV Turbo-Diesel is supplied respectively. A popular engine in the 80 series Land Cruiser, it replaced the 2H engine in the 80/85 series by 1990.

The 1HZ Toyota Landcruiser 4.2 litre (4164 cc) diesel inline 6-cylinder 12-valve SOHC (single overhead camshaft) is of the IDI or indirect injection design, and delivers maximum power of 96 kW (129 hp) at 3800 rpm and maximum torque of 285 N⋅m (210 lbf⋅ft) at 2200 rpm.

The 5-cylinder variant of this engine is known as 1PZ.

See also

Toyota KZ engine

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References

    Toyota 1HZ Head Toyota 1HZ Head.png
    Toyota 1HZ Head