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Toyota AZ engine

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Template:More citations needed Template:Infobox automobile engine

The Toyota AZ engine family is a straight-4 piston engine series. The AZ series uses an aluminium engine block with cast iron cylinder liners and aluminium DOHC cylinder head. The engine series features many advanced technologies including slant-squish combustion chambers, offset cylinder and crank centers, and the VVT-i continuously variable intake valve timing system. The aluminium engine measures Template:Convert long, Template:Convert wide, and Template:Convert tall.

The cylinder block is an open-deck, midi-skirt die-cast aluminium type with cast-in iron liners and a die-cast aluminium lower crankcase and a stamped oil pan. The forged steel crankshaft is fully balanced with eight counterweights and supported by five main bearings. A helical gear pressed in No. 3 counterweight drives twin contra-rotating balance shafts in the shaft housing within the lower crankcase.

The dual overhead camshafts are driven by a single-stage roller chain of Template:Convert pitch, enabling a narrow included valve angle of 27.5°. The camshafts act on four valves per cylinder via bucket tappets. As in the recent Toyota engine practice, no clearance adjusting shim is employed. Valve diameters are Template:Convert for intake and Template:Convert for exhaust, with Template:Convert lift for both intake and exhaust. The four-vane VVT-i device is fitted on the intake camshaft, altering timing by 50°. The valve cover is made of magnesium to save weight.

Fuel is injected sequentially via an ultra-fine-atomization injector with twelve small injection holes, each Template:Convert in diameter. As in the smaller NZ engine, the new AZ adopts a plastic, built-up, and vibration-welded intake manifold integrating a large volume plenum chamber (Template:Convert volume including a Template:Convert resonator). Exhaust manifolds are of tubular construction with integrated catalytic converters.

The AZ is the replacement for the S engine. Its successor is the AR engine.

Excessive oil consumptionEdit

The 2AZ-FE engine in the 2007-2009 Camry and 2006-2009 Rav4 may burn excessive oil and is involved in this lawsuit.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Other engines are also affected.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> If this Toyota engine is burning more than Template:Convert of oil in Template:Convert, has less than Template:Convert, is less than 10 years old, and is located in the U.S., Toyota service will perform a free oil consumption test to determine if the engine is affected. There are approximately 1,715,200 vehicles covered by this Warranty Enhancement Program.

A similar campaign are also done in Japan by Toyota in 2014.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

1AZEdit

The 1AZ line of engines have Template:Convert of displacement.

1AZ-FEEdit

The 1AZ-FE is a Template:Convert version. Output is Template:Convert at 6000 rpm with Template:Convert of torque at 4000 rpm for the Camry Aurion version. Rav4 and Ipsum engines were rated at Template:Convert at 6000 rpm and Template:Convert of torque at 4000 rpm.

The 1AZ has a total displacement of Template:Convert with Template:Convert bore and stroke, and a compression ratio of 9.6:1.

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1AZ-FSEEdit

The 1AZ-FSE is a Template:Convert version. Bore and stroke is Template:Convert, and a compression ratio of 11.0:1. Output is Template:Convert at 5700 rpm with Template:Convert of torque at 4000 rpm. The 1AZ-FSE features Toyota's D-4 direct injection system.

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2AZEdit

The 2AZ line of engines have Template:Convert of displacement.

2AZ-FEEdit

The 2AZ-FE is a Template:Convert version built in Japan (Kamigo Plant and by Toyota Industries Corporation), at TMMK in the USA and also built in China for select Scion xB models, and also in Australia, obtains a total displacement of Template:Convert with Template:Convert bore and stroke, with a compression ratio of 9.6:1. Output is Template:Convert at 5600 rpm; Template:Convert of torque at 4000 rpm.

Later versions of the 2AZ-FE engine were upgraded with 9.8:1 compression ratio, a slightly more aggressive intake cam profile, 6500 rpm redline, and piston oil squirters. These later versions are rated at Template:Convert in the Scion tC, Template:Convert in the RAV4, and Template:Convert in the Camry, Corolla XRS, Scion xB, and Template:Convert for the Previa/Estima/Alphard.

Some Japan-made Toyota vehicles with the 2AZ-FE engine were equipped with the K112 transmission also referred to as 7-speed Super CVT-i automatic (Seven-speed Sequential Shiftmatic) from October 2005.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

However, these later 2AZ-FE models were the first to be rated under the new SAE J1349 standard.Template:Citation needed The new standard usually produces more conservative numbers, though no definitive comparison is available since the two versions were never tested by the same standard. The RAV4 uses a different timing chain cover from the Camry, they can however be interchanged.Template:Citation needed

A TRD supercharger was available for the Scion tC and 2nd generation xB until Spring 2009.

There have been complaints of this engine "burning oil" in North America, with the issue starting after Template:Convert, though mostly after Template:Convert. Piston ring design has been identified as a potential problem. Toyota has issued a TSB (Technical service bulletin) TSB #0094-11 in August 2011 but has not issued a recall. Alternative theories point to a head gasket problem: the 2AZ-FE aluminum block threads may wear out on the back three middle bolts (closest to firewall).Template:Citation needed Check TSB SB-0015-11.

There are several class-action lawsuits underway regarding this issue. In January 2015, Toyota North America issued extended warranty notification (ZE7) for this issue for Toyota North America vehicles only.

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2AZ-FSEEdit

The 2AZ-FSE is a Template:Convert version. Bore and stroke is Template:Convert, and a compression ratio of 11.0:1. Output is Template:Convert at 5800 rpm with Template:Convert of torque at 3800 rpm. The 2AZ-FSE features Toyota's D-4 direct injection system.

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2AZ-FXEEdit

The 2AZ-FXE is an Atkinson cycle variant of the 2AZ-FE. It has the same bore and stroke, but the intake cam and pistons are unique. It has a physical compression ratio of 12.5:1.

The longer than normal open intake valve duration leads to a reduction in cylinder charge and reduced torque and power output, but efficiency is increased. This combination makes the 2AZ-FXE suitable for use only in hybrid vehicles, where peak torque and power demands can be met by the electric motor and battery.

Maximum output when used in the Camry hybrid is Template:Convert at 6000 rpm with Template:Convert of torque at 4400 rpm.

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3AZEdit

The 3AZ line of engines have Template:Convert of displacement.

3AZ-FXEEdit

The 3AZ-FXE is an Atkinson cycle engine which is always paired to an electric motor in a hybrid system. This engine is an analogue of the 2AZ-FXE which is for the Chinese market only.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Template:Hidden begin* 2010 Toyota Camry Hybrid AHV40 (China)Template:Hidden end

See alsoEdit

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ReferencesEdit

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