Toyota HZ engine

The Toyota 1HZ is an engine developed by Toyota Motor Corporation for the Toyota Land Cruiser and the Toyota Coaster Bus of 1990. It replaced the previous (2H) heavy duty engine which was being used in older Toyota Land Cruiser models.

Toyota HZ engine
A Toyota 1-HZ engine installed in the Land Cruiser.
Overview
ManufacturerToyota Motor Company
Production1990-present
Layout
ConfigurationStraight-6
Displacement4.2 L (4,164 cc)
Cylinder bore94 mm (3.70 in)
Piston stroke100 mm (3.94 in)
Cylinder block materialCast iron
Cylinder head materialCast iron
ValvetrainSOHC with 2 valves per cylinder
Valvetrain drive systemTiming belt
Compression ratio22.4:1
RPM range
Max. engine speed4000
Combustion
Fuel systemMechanical fuel injection
Fuel typeDiesel
Oil systemWet sump
Cooling systemWater-cooled
Output
Power output131 PS (129 hp; 96 kW)
Torque output285 N⋅m (29 kg⋅m; 210 lb⋅ft)
Chronology
PredecessorToyota H engine
Bottom view of the 1HZ head
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). Engine rotated 90 degrees clockwise

This engine generates more power and torque than previous diesel Toyota Land Cruiser 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

References

    Toyota 1HZ Head
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