Toyota H engine

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.

Toyota H engine
Overview
Manufacturer	Toyota Motor Company
Production	1967-1990
Layout
Configuration	Straight-6
Displacement	3.6 L (3,576 cc) 4.0 L (3,980 cc)
Cylinder bore	88 mm (3.46 in) 91 mm (3.58 in)
Piston stroke	98 mm (3.86 in) 102 mm (4.02 in)
Cylinder block material	Cast iron
Cylinder head material	Cast iron
Valvetrain	OHV with 2 valves per cylinder
Valvetrain drive system	Timing gears
Compression ratio	18.6:1-22.0:1
RPM range
Idle speed	650-750 rpm
Combustion
Turbocharger	Toyota CT26 on 12H-T
Fuel system	Mechanical fuel injection Direct injection
Fuel type	Diesel
Oil system	Wet sump
Cooling system	Water-cooled
Output
Power output	91–138 PS (90–136 hp; 67–101 kW)
Torque output	205–313 N⋅m (21–32 kg⋅m; 151–231 lb⋅ft)
Chronology
Predecessor	Toyota D engine
Successor	Toyota HZ engine

H

The H is a 3.6 L (3,576 cc) inline 6, 12-valve OHV diesel engine.^[1] 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.^[1]

Applications

• Toyota Land Cruiser HJ45
• Toyota Dyna HU15 HU30
• Toyota Weapon carrier HQ15

2H

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 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. This engine weighs 330 kg (728 lb) in European trim from 1985.^[2] Compared to its predecessor, the 2H proved to be much more reliable.

Applications

• Toyota Land Cruiser HJ47, HJ60, HJ75
• Toyota Dyna HU20, 30, 40, 50
• Toyota Coaster HB20, 30

12H-T

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 134 hp (100 kW) at 3500 rpm with 232 lb·ft (315 N·m) of torque at 1,800 rpm, on the stock configuration of 7PSI of boost.^[3]

• Toyota Land Cruiser HJ61
• Toyota Coaster HB20, 30