Toyota 1NZ-FE

Toyota 1NZ-FE engine specsThe Toyota 1NZ-FE is a 1.5 L (1,497 cc, 91.35 cu-in) straight-four 4-stroke natural aspirated gasoline engine from Toyota NZ-family. The 1NZ-FE engine was manufactured on Kamigo Plant since 1999.

The 1NZ-FE engine features a lightweight aluminum block and aluminum cylinder head with two overhead camshafts (DOHC) and four valves per cylinder (16 in total). Compression ratio rating is 10.5:1. Cylinder bore and piston stroke are 75.0 mm (2.95 in) and 84.7 mm (3.34 in), respectively.

The Toyota 1NZ-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 1NZ-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 110 PS (81 kW; 109 HP) at 6,000 rpm of maximum horsepower and 143 Nm (14.6 kg·m; 105.6 ft·lb) at 4,000 rpm of peak torque.

The breakdown of the engine code is as follows:

  • 1 – 1-st generation engine
  • NZ – Engine family
  • F – Economy narrow-angle DOHC
  • E – Multi Point Fuel Injection

General information

Engine Specifications
Engine code1NZ-FE
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production1999-
Displacement1.5 L, 1,497 cm3 (91.35 cu in)
Fuel systemElectronic Fuel Injection (EFI)
Power adderNone
Power output110 PS (81 KW; 109 HP) at 6,000 rpm
Torque output143 Nm (14.6 kg·m; 105.6 ft·lb) at 4,000 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight87 kg (191.2 lbs)

Cylinder block

The Toyota 1NZ-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 84.7 mm (3.33 in) piston stroke. The engine has two compression and single oil control ring.

The steel connecting rods for the 1NZ-FE engine has caps that were 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).

Cylinder block
Cylinder block alloyAluminium
Compression ratio:10.5:1
Cylinder bore:75.0 mm (2.95 in)
Piston stroke:84.7 mm (3.34 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):75.000-75.013 mm (2.9527-2.9528 in)
Piston skirt diameter (standard):74.945-74.955 mm (2.9506-2.9510 in)
Piston pin outer diameter:18.001-18.004 mm (0.7087-0.7088 in)
Piston ring side clearance:Top0.030-0.070 mm (0.0012-0.0027 in)
Second0.020-0.060 mm (0.008-0.0024 in)
Oil0.070-0.150 mm (0.0027-0.0059 in)
Piston ring end gap:Top0.25-0.35 mm (0.0098-0.0138 in)
Second0.35-0.50 mm (0.0138-0.0197 in)
Oil0.10-0.35 mm (0.0039-0.0138 in)
Crankshaft journal diameter:45.988-46.000 mm (1.8105-1.8110 in)
Crankpin diameter:39.992-40.000 mm (1.5745-1.5748 in)

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 camshaft design with four valves per cylinder. The engine has a pentroof type combustion chamber and cross-flow manifolds.

The 1NZ-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). Until 2004, the engine did not have hydraulic lifters, so special valve shims were used to adjust the valve clearance.

Cylinder head
Valve Arrangement:DOHC, chain drive
Valves:16 (4 valves per cylinder)
Valve head diameter:INTAKE30.5 mm (1.20 in)
EXHAUST25.5 mm (1.00 in)
Valve length:INTAKE89.25 mm (3.5138 in)
EXHAUST87.90 mm (3.4606 in)
Valve stem diameter:INTAKE4.970-4.985 mm (0.1957-0.1963 in.)
EXHAUST4.965-4.980 mm (0.1955-0.1961 in.)
Valve spring free length:45.05-45.15 mm (1.774-1.778 in.)
Camshaft cam height:INTAKE44.617-44.717 mm (1.7566-1.7605 in.)
EXHAUST44.666-44.766 mm (1.7585-1.7624 in.)
Outer camshaft journal diameter:№134.449-34.465 mm (1.3563-1.3569 in.)
Other journals diameter22.949-22.965 mm (0.9035-0.9041 in.)

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
Intake valve0.15-0.25 mm (0.006-0.010 in)
Exhaust valve0.25-0.35 mm (0.010-0.014 in)
Compression pressure
Standard15.0 kg/m2 (213 psi) / 200 rpm
Minimun11.0 kg/m2 (156 psi) / 200 rpm
Compression differential limit between cylinders1.0 kg/m2 / 200 rpm
Oil system
Oil consumption , L/1000 km (qt. per miles)up to 0.5 (1 qt. per 1200 miles)
Recommended engine oil5W-30, 10W-30
Oil type APISJ or higher
Engine oil capacity (Refill capacity) With filter change 3.4 l
Without filter change 3,7 l
Oil change interval, km (miles)5,000-10,000 (3,000-6,000)
Ignition system
Spark plugDENSO: K16R-11, NGK: KBR5EYA-11
Spark plug gap1.1 mm (0.043 in)

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

ModelYears Produced
Toyota Vios
Toyota Belta
Toyota Echo
Toyota Yaris
Scion xA
Scion Ist
Scion xB
Toyota bB
Toyota Raum
Toyota Porte
Toyota Platz
Toyota Ist
Toyota Auris
Toyota Fun Cargo
Toyota Premio
Toyota Allion
Toyota Sienta
Toyota WiLL VS
Toyota Probox
Toyota Ractis
Toyota Corolla (Axi, Fielder, RunX, Allex)
Geely CK
Geely MK
Great Wall C10
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18 Comments

    • No … specified engine oil is 5w30 or 10w30 ……20w50 is to thick a viscosity and can cause engine damage during cold/warm engine operation.

      Oil is a film which resides between your mechanical bits, where clearance exists. 30 thickness oil has an operational thickness of 9.3 to 12.5 cSt ……. 50 thickness oil has an operational thickness of 16.3 to 21.9 cSt…. both at 100 C….the pressures placed upon the oil pump vastly increase as it attempts to deliver oil of a much greater viscosity 20w50 through a system designed for oil of a much thinner viscosity 5w or 10w 30….

      Eventually your oil pump will fail under the extreme stresses caused by the thicker oil. Usually the failure occurs at the oil pump driven gear shaft…. a failed oil pump will result in a non lubricated engine….

  1. I have two questions.

    1. what are the recomended spark plugs for Toyota Corolla Runx 1NZ-FE

    How often can I change ATF?

  2. hi
    speed meter installed in 1nzef engine does no show millage rate .their any speed meter which adjust in 1nz-ef engine x corolla 2003

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