Engine Toyota 1HZ

The 4.2-liter Toyota 1HZ engine has been produced in Japan since 1990 and is still installed on the Land Cruiser 70 SUV, which is popular in a number of countries. The atmospheric diesel engine with a single 12-valve camshaft is an example of reliable and unpretentious technology.

Although these motors were installed on large SUVs, their strong point is by no means outstanding power figures. With such a large volume of 4.2 liters, the engine produces only 129-131 hp. However, 1HZ engines have a lot of mileage potential, many people think they can go 1 million kilometers. They are able to use almost any diesel fuel, endure extreme temperatures, while they practically do not suffer from minor breakdowns and have a reliable cylinder-piston group that is subject to major repairs and boring.

The engine was installed on:

• Toyota Land Cruiser 70 (J70) since 1990;
• Toyota Land Cruiser 100 (J100) in 1998 – 2007;
• Toyota Coaster 2 (B20) in 1990 – 1993; Coaster 3 (B40) in 1993 – 2003.

Specifications

Production years	since 1990
Displacement, cc	4164
Fuel system	vortex chamber IDI
Power output, hp	129 – 131
Torque output, Nm	271 – 290
Cylinder block	cast iron R6
Block head	cast iron 12v
Cylinder bore, mm	94
Piston stroke, mm	100
Compression ratio	22.4 22.7
Features	no
Hydraulic lifters	no
Timing drive	belt
Phase regulator	no
Turbocharging	no
Recommended engine oil	5W-30 10W-30 15W-40 20W-50
Engine oil capacity, liter	9.3
Fuel type	diesel
Euro standards	EURO 1
Fuel consumption, L/100 km (for Toyota Land Cruiser 100 2001) — city — highway — combined	14.1 10.8 11.1
Engine lifespan, km	~600 000
Weight, kg	300

Frequent problems

• it is necessary to adjust the thermal clearances of the valves every 50,000 km;
• the timing belt has to be changed about once every 100 thousand kilometers;
• the injection pump system suffers on almost all engines by 500 thousand mileage;
• special installation of ignition tags is required;
• Poor fuel quality slowly destroys the piston group and valves.

Otherwise, the reliability of this diesel engine is exemplary.