The Toyota H engine was first produced in 1967 but did not reach road cars until 1972. The H engine was then replaced by the 2H engine and the 12H-T turbo engine. It was succeeded by the more advanced SOHC HZ series 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 at 3,600 rpm with of torque at 2,200 rpm.
Applications
The 2H is a 4.0 L (3,980 cc) inline 6, 12 valve OHV indirect injection diesel engine. Bore is 91 mm and stroke is 102 mm, with a compression ratio of 20.7:1. Output is at 3,500 rpm - later production years 107 hp (80 kW) with 177 lb÷ft (240 N÷m) of torque at 2,000 rpm. This engine weighs in European trim from 1985. Compared to its predecessor, the 2H proved to be much more reliable.
Applications
The 12H-T is a 4.0 L (3,980 cc) inline 6, 12 valve OHV turbocharged direct injection diesel engine. Bore is 91 mm and stroke is 102 mm, with a compression ratio of 18.6:1. Output is at 3500 rpm with of torque at 1,800 rpm, on the stock configuration of 7 PSI of boost.