Characteristics of the 1KZ-TE/1KZ-T engine
| Characteristic | Value |
|---|---|
| Manufacturing | Toyota Motor Corporation |
| Engine make | 1KZ |
| Years of manufacture | 1993-2006 |
| Cylinder block material | Cast iron |
| Engine type | Diesel |
| Configuration | Ready |
| Number of cylinders | 4 |
| Valves per cylinder | 2 |
| Piston stroke, mm | 103 |
| Cylinder diameter, mm | 96 |
| Compression ratio | 21.2 |
| Engine displacement, cc | 2982 |
| Engine power, hp/rpm | 125/3600, 130/3600, 145/3600 |
| Torque, Nm/rpm | 287/2000, 332/2000, 343/2000 |
| Environmental regulations | – |
| Turbocharger | Toyota CT12B |
| Engine weight, kg | – |
| Fuel consumption, l/100 km (city / highway / mixed for Prado 90) | 13.2/9.6/11.0 |
| Oil consumption, g/1000 km | To 1000 |
| Engine oil | 5W-30, 5W-40, 10W-30, 10W-40, 15W-40 |
| How much oil in the engine, liters | 7.0 (1KZ-TE), 7.7 (1KZ-T) |
| Oil change is carried out, km | 10000 (better 5000) |
| The operating temperature of the engine, deg. | – |
| Engine life, thousand kilometers | Factory data: -, In practice: 500+ |
| Tuning, h.p. | Potential: 200+, Without loss of resource: – |
| Motor installed | Toyota 4Runner/Hilux Surf, Toyota HiAce, Toyota Hilux, Toyota Land Cruiser Prado 70/90 |
Reliability, problems and repair of the 1KZ-TE/1KZ-T engine
In 1993, a turbocharged inline 4-cylinder 1KZ diesel engine was released. The cylinder block of this motor is cast iron and equipped with two balancer shafts. Inside put a crankshaft with a stroke of 103 mm, pistons with a diameter of 96 mm and received a working volume of 3 liters.
On top of this block is an aluminum head with a single camshaft and two valves per cylinder. The diameter of the inlet valves is 42.5 mm, the exhaust valves 37 mm, and the thickness of the valve stem is 8 mm.
On the 1KZ you need to adjust the valves every 40k miles. Clearances on cold engine: intake 0.2-0.3 mm, exhaust 0.25-0.35 mm.
The timing belt is used in the timing drive, replacement of the timing belt is required every 100 thousand kilometers, otherwise the valves will bend.
The 1KZ-T engine has a mechanical fuel injector, and the 1KZ-TE engine has an electronic control. Power of the first one is 125 hp at 4000 rpm, and torque is 287 Nm at 2000 rpm. Output of the second is 130 hp at 3600 rpm and torque is 332 Nm at 2000 rpm.
The 1KZ version with intercooler has 140 hp, while the same version with electronic gas pedal showed 145 hp at 3600 rpm and 343 Nm of torque at 2000 rpm.
All these figures are not achieved without the help of the Toyota CT12B turbocharger, which inflates up to 0.8 bar.
As a bonus, the 1KZ was equipped with EGR system.
In 2006, the motor was no longer produced, and its place was taken by another 1KD diesel.
Problems and disadvantages of Toyota 1KZ engines
- Overheating. Usually occurs due to a dirty radiator, non-functioning visco clutch, thermostat, pump or cracks in the head.
- Crack in the cylinder head. You probably overheated the motor and the head is cracked, bubbles in the expansion tank will confirm this diagnosis. This is a common case for 1KZ, there is only one cure – you need to buy a working head.
If 1KZ do not overheat, the resource of the engine and turbine is high and, with normal maintenance with appropriate care, your motor can pass 500 thousand kilometers and even more.
Tuning engine 1KZ
Chip tuning
This motor should not be tuned at all: the motor is old, worn out and with tuning its resource is noticeably reduced. If for some reason you need to raise the power of this particular engine, then the firmware will give up to 200 hp. After that, the car will not become an airplane, but the motor will fall apart noticeably earlier.
MOTOR RATING: 4+