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FE Toyota engine

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Engine toyota

2AZ-FE Toyota engine

Introduction

Toyota's 2AZ-FE was a 2.4-litre four-cylinder petrol engine that was first introduced in Australia in the . The 2AZ-FE engine featured mass reduction measures such as an aluminium alloy cylinder block, plastic intake manifold and magnesium-alloy die-cast cylinder head cover. With a service weight of 110 kg, the 2AZ-FE engine was 50 kg lighter than the 5S-FE engine it replaced.

In 2006, an upgraded version of the 2AZ-FE engine was introduced for the , and . Changes for this updated engine included:
  • A higher compression ratio of 9.8:1 (compared to 9.6:1);
  • A more aggressive intake camshaft profile;
  • Piston oil jets for better lubrication and lower operating temperatures;

  • It is this updated 2AZ-FE engine which was susceptible to excessive oil consumption (detailed below).

    2A-FZE Toyota engine

      Engine Trans. Years Peak power Peak torque

    Toyota XR30 Tarago 2.4-litre petrol I4 4sp auto 2000-06 115kW at 5600rpm 221Nm at 4000rpm

    Toyota XR50 Tarago 2.4-litre petrol I4 4sp auto 2006-12 125kW at 6000rpm 224Nm at 4000rpm

    7sp DCT 2012-on

    Toyota XV30 Camry 2.4-litre petrol I4 5sp man.,
    4sp auto 2002-06 112kW at 5600rpm 218Nm at 4000rpm

    Toyota XV40 Camry 2.4-litre petrol I4 5sp man.,
    5sp auto 2006-12 117kW at 5700rpm 218Nm at 4000rpm

    Toyota T250 Avensis Verso 2.4-litre petrol I4 4sp auto 2003-10 118kW at 5700rpm 221Nm at 4000rpm

    Toyota XA20 RAV4 2.4-litre petrol I4 5sp man.,
    4sp auto 2003-05 120kW at 6000rpm 224Nm at 4000rpm

    Toyota XA30 RAV4 2.4-litre petrol I4 5sp man.,
    4sp auto 2006-12 125kW at 6000rpm 224Nm at 4000rpm

    Toyota Rukus 2.4-litre petrol I4 4sp auto 2010-on 117kW at 5700rpm 218Nm at 4000rpm

    2AZ-FE cylinder block

    The aluminium alloy cylinder block of the 2AZ-FE engine had 88.5 mm bores and a 96.0 mm stroke for a capacity of 2362 cc. The 2AZ-FE engine had cast iron liners which were manufactured so that their casting exteriors formed large, irregular surfaces (‘spiny type’) for better adhesion between the liners and the cylinder block.

    Other features of the 2AZ-FE cylinder block included:
  • Air passage holes in the crankshaft bearing area of the cylinder block for better air flow and reduced back pressure at the bottom of the pistons;
  • Water jacket spacers which suppressed water flow in the centre of the jackets and guided the coolant around the cylinder bores;
  • Oil filter and air conditioning compressor brackets that were integrated into the crankcase; and,
  • The water pump swirl chamber and thermostat housing were also integrated into the cylinder block.
  • Balance shafts

    The 2AZ-FE engine had twin counter rotating balance shafts that rotated twice for each rotation of the crankshaft to cancel secondary inertia forces. To cancel the inertial forces generated by the balance shaft itself, a second balance shaft rotated in the opposite direction. The drive for the no.1 balance shaft was driven via a gear on the number three crankshaft counter weight. To suppress noise and vibrations, the balance shafts were driven by resin gears.

    Crankshaft, connecting rods and pistons

    The 2AZ-FE engine had a forged steel crankshaft with five journals, eight balance weights and roll-finished pin and journal fillets. The 2AZ-FE’s crankshaft was offset by 10 mm to the thrust side of the cylinder bore centre line to reduce friction. According to Toyota, this design reduced fuel consumption by between one and three percent.

    The connecting rods and caps were made of high-strength steel. To reduce mass, nut-less type plastic region tightening bolts and narrow connecting rod bearings were used.

    The 2AZ-FE engine had aluminium alloy pistons. While the piston head had a taper squish shape, the piston skirt was coated with resin to reduce frictional losses. For the updated, post-2006 2AZ-FE engine, the cylinder block contained oil jets for lubricating and cooling the pistons; these jets contained a check valve to prevent oil from being fed when oil pressure was low and to prevent overall oil pressure in the engine from dropping.

    Cylinder head

    The 2AZ-FE engine had an aluminium alloy cylinder head which was mounted upon a steel-laminate type head gasket; to increase the sealing surface, a shim was used around the cylinder bore. To reduce mass, the 2AZ-FE engine had a magnesium alloy die-cast cylinder head cover.

    Camshafts

    The 2AZ-FE engine had double overhead camshafts (DOHC) that were driven by a roller chain which had an 8 mm pitch and was lubricated by an oil jet. The chain tensioner used a spring and oil pressure to maintain chain tension; it also used a ratchet type non-return mechanism.

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