Toyota H engine
The H is a 3.6 L (3,576 cc) inline 6, 12-valve OHV diesel engine. Bore is 88 mm and stroke is 98 mm, with a compression ratio of 21:1. Output is 95 PS (70 kW) at 3,600 rpm with 22.0 kg·m (216 N·m; 159 lb·ft) of torque at 2,200 rpm.
The 2H is a 4.0 L (3,980 cc) inline 6, 12 valve OHV diesel engine. Bore is 91 mm and stroke is 102 mm, with a compression ratio of 20.7:1. Output is 105 PS (77 kW) at 3,500 rpm - later production years 107 hp (80 kW) with 177 lb·ft (240 N·m) of torque at 2,000 rpm.
The 12H-T is a 4.0 L (3,980 cc) inline 6, 12 valve OHV turbocharged diesel engine. Bore is 91 mm and stroke is 102 mm, with a compression ratio of 18.6:1. Output is 134 hp (100 kW) at 3500 rpm with 232 lb·ft (315 N·m) of torque at 1,800 rpm.
Toyota HZ engine
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 for some markets.
A popular engine in the 80 series Land Cruiser and replacing the 70/75 series 2H in the early 90s.