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Bottom view of the 1HZ head

Bottom view of 1HZ/1HDT connecting rods and crank

Front view of 1HZ/1HDT timing gears. Engine rotated 90 deg clockwise

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. This engine generates more power and torque than previous diesel Toyota Land Cruiser engine. Although the advanced 1HD-FTE engine is being installed in current Toyota Land Cruiser production, the 1HZ is still being used under some custom configurations of Toyota Land Cruiser. A popular engine in the 80 series Land Cruiser and replacing the 70/75 series 2H in the early 90s.

Explanation of Images [link]

The 1HZ Toyota Landcruiser 4.2 Diesel 6-cylinder 12-valve ohc (over head camshaft) is of the IDI or indirect injection design, and delivers maximum power of 96 kW (129 hp) @3800 rpm and maximum torque of 285Nm (210lbft) @2200 rpm.

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