Toyota 1AZ-FE

Toyota 1AZ-FEThe Toyota 1AZ-FE is a 2,0 l (1,998 cc, 121.93 cu-in) straight-four 4-stroke natural aspirated gasoline engine from Toyota AZ-family. This engine was manufactured by Toyota Motor Company from 2000 on Kamigo Plant and Shimoyama Plant.

The Toyota 1AZ-FE features a lightweight aluminum block with thin cast-iron cylinder liners and aluminum head with two camshafts (DOHC) and four valves per cylinder (two intakes and two exhaust). The 1AZ-FE engine has VVT-i (Variable Valve Timing with intelligence) for intake side, Sequential MPFI fuel injection system, Toyota DIS “Direct Ignition System” with ignition coil for each spark plug. The 1AZ-FE engine is also equipped with “Electronic Spark Advance” (ESA) system, which selected optimal ignition timing in accordance with inputs from sensors.

An 86.0 mm (3.39 in) cylinder bore and 86.0 mm (3.39 in) piston stroke give the 1AZ-FE motor a total of 1,998 cc (121.93 cu-in) of displacement. Compression ratio rating is 9.8:1.

The engine produces from 147 PS (108 kW; 145 HP) at 6,000 rpm to 152 PS (112 kW; 150 HP) at 6,000 rpm of maximum horsepower and from 190 Nm (19.4 kg·m; 140.2 ft·lb) at 4,000 rpm to 193 Nm (19.7 kg·m; 142.4 ft·lb) at 4,000 rpm of peak torque.

The breakdown of the engine code is as follows:

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

General information

Engine Specifications
Engine code1AZ-FE
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline (petrol)
Production2000-
Displacement2.0 L, 1,998 cc (121.93 cu in)
Fuel systemSequential MPFI
Power adderNone
Power output From 147 PS (108 kW; 145 HP) at 6,000 rpm
to 152 PS (112 kW; 150 HP) at 6,000 rpm
Torque output From 190 Nm (19.4 kg·m; 140.2 ft·lb) at 4,000 rpm
to 193 Nm (19.7 kg·m; 142.4 ft·lb) at 4,000 rpm
Firing order1-3-4-2
Dimensions (L x W x H):
Weight With A/T: 117 kg (258 lb.)
With M/T: 123 kg (271 lb.)

Cylinder block

The 1AZ-FE has an open-deck die-cast aluminum cylinder block with cast-iron liners and a die-cast aluminum lower crankcase and a stamped oil pan. The forged steel crankshaft is fully balanced with eight counterweights and supported by five main bearings.

The connecting rods and caps are made of high-strength steel. To reduce engine weight, nut-less type plastic region tightening bolts are used. The engine used aluminum pistons with two compression and single oil ring. The cylinder bore is 86.0 mm (3.39 in) and the piston stroke is 86.0 mm (3.39 in). Compression ratio rating is 9.8:1.

Cylinder block
Cylinder block alloyAluminium
Compression ratio:9.8:1
Cylinder bore:86.0 mm (3.39 in)
Piston stroke:86.0 mm (3.39 in)
Number of piston rings (compression / oil):2 / 1
Number of main bearings:5
Cylinder inner diameter (standard):86.000-86.013 mm (3.3858-3.3863 in)
Piston skirt diameter (standard):85.927-85.937 mm (3.3829-3.3833 in)
Piston pin outer diameter:22.000 mm (0.8661 in)
Piston ring side clearance:Top0.020-0.070 mm (0.0008-0.0028 in)
Second0.020-0.060 mm (0.0008-0.0024 in)
Piston ring end gap:Top0.30-0.40 mm (0.0118-0.0157 in)
Second0.47-0.62 mm (0.0185-0.0244 in)
Oil0.10-0.35 mm (0.0039-0.0138 in)
Crankshaft main journal diameter:54.998-55.000 mm (2.1652-2.1653 in)
Crankpin diameter:47.990-48.000 mm (1.8894-1.8898 in)

Main bearing cap bolts tightening procedure and torque specs:

  • Step 1: 20 Nm; 2.0 kg·m; 15 ft·lb
  • Step 2: 40 Nm; 4.0 kg·m; 29 ft·lb

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

Connecting rod bearing bolts

  • Step 1: 25 Nm; 2.5 kg·m; 18 ft·lb
  • Step 2: Turn bolts 90°

Cylinder head

The cylinder head is made of strong, light aluminum alloy which gives it good cooling efficiency. Each camshaft is supported by five bearings. The dual overhead camshafts are driven by a single-stage roller chain. The camshafts act on four valves per cylinder via bucket tappets. Valve diameters are 34.0 mm (1.3 in) for intake and 29.5 mm (1.2 in) for exhaust.

For the pre-2003 1AZ-FE engine, intake duration was 236 degrees and exhaust duration was 228 degrees. For the upgraded version of the 1AZ-FE engine that was introduced in late 2003, intake duration was 243 degrees and exhaust duration 220 degrees.

The 1AZ-FE engine used electronically controlled sequential fuel injection system with 12-hole injector nozzles that are mounted in the inlet ports.

Cylinder head
Valve Arrangement:DOHC, chain drive
Valves:16 (4 valves per cylinder)
Valve head diameter:INTAKE34.0 mm (1.3385 in)
EXHAUST29.5 mm (1.1614 in)
Valve length:INTAKE101.71 mm (4.004 in)
EXHAUST101.15 mm (3.982 in)
Valve stem diameter:INTAKE5.470-5.485 mm (0.2153-0.2159 in)
EXHAUST5.465-5.480 mm (0.151 – 0.2157 in)
Valve spring free length:45.7 mm (1.7990 in)
Outer camshaft journal diameter:№135.971-35.985 mm (1.4162-1.4167 in)
№2, 3, 4, 522.959-22.975 mm (0.9039-0.9045 in)

Head tightening procedure and torque specs:

  • Step 1: 79 Nm; 8.0 kg·m; 58 ft·lb
  • Step 2: Turn all bolts 90°

Camshaft bearing cap bolts

  • № 1:30 Nm; 3.0 kg·m; 22 ft·lb
  • Other:9 Nm; 0.9 kg·m; 6.4 ft·lb

Maintenance data

Valve clearance (HOT)
Intake valve0.19-0.29 mm (0.007-0.011 in)
Exhaust valve0.30-0.40 mm (0.012-0.016 in)
Compression pressure
Standard13.0 kg/m2 / 200 rpm
Minimun11.0 kg/m2 / 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 oil 5W-20, 5W-30, 10W-30
Oil type APISJ
Engine oil capacity (Refill capacity) With filter change 4.4 l
Without filter change 4.2 l
Oil change interval, km (miles)10,000 (6,000)
Oil Pressure, kPa (bar, kg/cm 2, psi) Idle speed: More than 60 (0.6, 0.61, 9)
2,000 rpm: More than 270 (2.7, 2.8, 39)
Ignition system
Spark plugDENSO: SK20R11 NGK: IFR6A11
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 – 0.24 mm (0.009 in)]
Exhaust:
N = R + [M – 0.35 mm (0.014 in)]

Valve lifters are available in 35 sizes to range from 5.06 mm (0.1992 in) to 5.74 mm (0.2260 in), in steps of 0.02 mm (0.0008 in).

Example (intake valve):
R = 5.12 mm
M = 0.45 mm
N = 5.12 + (0.45 – 0.35) = 5.22 mm, so we need a valve lifter 5.22 mm (0.2055 in).

Vehicle applications

ModelYears Produced
Toyota Camry (Aurion)2006–2009
Toyota RAV42000–2003
Toyota RAV4 Euro2003-2006
Toyota Ipsum2001–2009
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