Toyota 2NZ-FE

The Toyota 2NZ-FE is a 1.3 l (1,298 cc, 79.21 cu-in) straight-four 4-stroke natural aspirated gasoline engine from Toyota NZ-family. The 2NZ-FE engine was manufactured on Kamigo Plant (Aichi Prefecture, Japan) from 1999.

The 2NZ-FE engine features a lightweight aluminum block and aluminum cylinder head with dual overhead camshafts (DOHC) and four valves per cylinder (16 in total). Compression ratio rating is 10.5:1. It has a 75.0 mm (2.95 in) cylinder bore and 73.5 mm (2.89 in) piston stroke. The Toyota 2NZ-FE engine has electronic fuel injection system, VVT-i (Variable Valve Timing with intelligence) system on the intake side, ETCS-i (Electronic Throttle Control System-intelligent) and DIS-4 ignition system with individual ignition coil for each spark plug.

The 2NZ-FE engine was redesigned in 2003 due to the introduction of Euro IV emissions regulations. The following changes were made to the engine:

• Piston shape was changed;
• The shape of the exhaust manifold was modified;
• Construction of the three-way catalytic converter was changed;
• Three-way catalytic converter was fitted;
• The 16 tit ECU was changed to 32 bit.

The engine produced 85.7 PS (63 kW; 84.5 HP) at 6,000 rpm of maximum horsepower and 121 Nm (12.34 kg·m; 89.3 ft·lb) at 4,400 rpm of peak torque.

The breakdown of the engine code is as follows:

• 2 – 2-nd generation engine
• NZ – Engine family
• F – Economy narrow-angle DOHC
• E – Multi Point Fuel Injection

General information

Cylinder block

The Toyota 2NZ-FE has an aluminum cylinder block with five bearing support system and thin-walled cast iron liners. It has a 75.0 mm (2.95 in) cylinder bore and 73.5 mm (2.89 in) piston stroke. The engine has a crankshaft with four balance weights and an integrated crankshaft position sensor.

The steel connecting rods for the 2NZ-FE engine has caps that are held by plastic region tightening bolts. The engine is equipped with aluminum alloy pistons, semi-floating type piston pins and low-tension rings (two compression and single oil control ring).

Main bearing cap bolts tightening procedure and torque specs:

• Step 1: 22 Nm; 2.2 kg·m; 16.2 ft·lb
• Step 2: Turn all bolts 90°

After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.

Connecting rod bearing bolts

• Step 1: 15 Nm; 1.5 kg·m; 11 ft·lb
• Step 2: Turn bolts 90°

Crankshaft pulley bolt

• 128 Nm; 13.0 kg·m; 94.5 ft·lb

Drive plate (A/T) fixing bolts

• 88 Nm; 8.8 kg·m; 65 ft·lb

Cylinder head

The cylinder head is made of aluminum alloy which gives it good cooling efficiency. The engine has dual overhead camshafts, that are driven by a roller timing chain which has an 8.0 mm pitch and four valves per cylinder (16 valves in total). The timing chain is lubricated by engine oil from an oil jet. The engine has a pentroof type combustion chamber and cross-flow manifolds.

The 2NZ-FE used Variable Valve Timing with intelligence system (VVT-i) on the intake camshaft. Intake valves are 30.5 mm (1.20 in) in diameter, and the exhaust valves are 25.5 mm (1.00 in). The engine has an intake duration of 225 degrees and exhaust duration of 216 degrees. The 2NZ engine used special valve shims to adjust the valve clearance.

Head tightening procedure and torque specs:

• Step 1: 29 Nm; 3.0 kg·m; 22 ft·lb
• Step 2: Turn all bolts 90°
• Step 3: Turn all bolts another 90°

Camshaft timing sprocket

• 64 Nm; 6.5 kg·m; 47 ft-lb

Maintenance data

Valve clearance adjustment data

Calculate the thickness of new adjusting valve lifter so valve clearance comes within specified values.

R = Thickness of removed valve lifter
N = Thickness of new valve lifter
M = Measured valve clearance

Intake:
N = R + [M – 0.20 mm (0.008 in)]
Exhaust:
N = R + [M – 0.30 mm (0.012 in)]

Valve lifters are available in 35 sizes to range from 5.06 mm (0.1992 in) to 5.74 mm (0.2259 in), in steps of 0.02 mm (0.0008 in).

Example (intake valve):
R = 5.10 mm
M = 0.52 mm
N = 5.10 + (0.52 – 0.20) = 5.42 mm.

Vehicle applications

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.