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.
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 |
The engine was installed on:
- Toyota Land Cruiser 70 (J70) since 1990, Land Cruiser 100 (J100) in 1998 – 2007;
- Toyota Coaster 2 (B20) in 1990 – 1993, Coaster 3 (B40) in 1993 – 2003.
Disadvantages of the Toyota 1HZ engine
- 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.
Frequently asked questions about the Toyota 1HZ
How much power does the Toyota 1HZ make?
The Toyota 1HZ develops 129 - 131 hp and 271 - 290 Nm of torque.
How much oil does the Toyota 1HZ take and which one?
Engine oil capacity: 9.3 liters. Recommended oil: 5W-30; 10W-30; 15W-40; 20W-50.
Does the Toyota 1HZ have a timing belt or chain?
The Toyota 1HZ uses a timing belt.
Is the Toyota 1HZ turbocharged?
No, the Toyota 1HZ is naturally aspirated.
Does the Toyota 1HZ need valve clearance adjustment?
Yes, there are no hydraulic lifters, so the valve clearances have to be checked and adjusted periodically.
How long does the Toyota 1HZ last?
The typical lifespan of the Toyota 1HZ is ~600 000 km with proper maintenance.
What is the fuel consumption of the Toyota 1HZ?
Toyota Land Cruiser 100 2001: city 14.1, highway 10.8, combined 11.1 L/100 km.
What cars was the Toyota 1HZ installed on?
Toyota Land Cruiser 70 (J70) since 1990, Land Cruiser 100 (J100) in 1998 - 2007; Toyota Coaster 2 (B20) in 1990 - 1993, Coaster 3 (B40) in 1993 - 2003.
What are the common problems of the Toyota 1HZ?
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. All known problems.
I live in Nicaragua and I bought a 88 bj70 that the motor was replaced by a 1HZ and I don’t know what year the motor is. It has the black top on it and I was told that it was probably a 2010-2012 since the lack top wasn’t made earlier. Could you tell me how I can find out what year the motor is. Thanks
What is the turbocharger part number for 1hz 131hp 1990 4.2L 6 cylinder?