TOYOTA-1HZ-4.2 ENGINE

Engine Specifications
Engine code	1HZ
Layout	Straight-6, vertical
Fuel type	Diesel
Production	–
Displacement	4.2L, 4,164 cc (254.1 cu in)
Injection pump	Mechanical
Power adder	None
Horsepower net	131 PS (96 KW; 129 HP) at 3,800 rpm 135 PS (99 KW; 133 HP) at 4,000 rpm
Torque output	279 Nm (28.5 kg·m; 205.9 ft·lb) at 2,200 rpm 284 Nm (29.0 kg·m; 209.6 ft·lb) at 2,200 rpm
Firing order	1-4-2-6-3-5
Dimensions (L x H x W):	–
Weight

The Toyota 1HZ is a 4.20 l (4,164 cc, 254.1 cu-in) six cylinders, four-stroke cycle water-cooled naturally aspirated internal combustion diesel engine, manufactured by the Toyota Motor Corporation.

The 1HZ engine has a cast-iron cylinder block with 94.0 mm (3.7 in) cylinder bores and a 100.0 mm (3.94 in) piston stroke. Compression ratio rating was 22.7:1. In 1998, the 1HZ engine received a reinforced cylinder block and crankshaft, new pistons and glow plugs, the compression was reduced to 22.4:1. Since 2002 the engine is equipped with an EGR system.