Engine Jaguar AJ34

The Jaguar AJ34 4.2-liter gasoline engine was produced by the company from 2003 to 2009 and was installed on such popular models as the XK and XJ, as well as the S-Type and its successor XF. On the basis of this unit, a motor was created for Land Rover SUVs under the AJ41 index.

AJ-V8 series: AJ126, AJ27, AJ27S, AJ28, AJ33, AJ33S, AJ34, AJ34S, AJ133, AJ133S.


Production years 2003-2009
Displacement, cc 4196
Fuel system distributed injection
Power output, hp 305
Torque output, Nm 420
Cylinder block aluminum V8
Block head aluminum 32v
Cylinder bore, mm 86
Piston stroke, mm 90.3
Compression ratio 11.0
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator VVT at the intake
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 7.0
Fuel type petrol
Euro standards EURO 4
Fuel consumption, L/100 km (for Jaguar XK 2007)
— city
— highway
— combined
Engine lifespan, km ~350 000

The engine was installed on:

  • Jaguar S-Type 1 (X200) in 2004 – 2007;
  • Jaguar XF 1 (X250) in 2008 – 2009;
  • Jaguar XJ 7 (X350) in 2003 – 2009;
  • Jaguar XK 2 (X150) in 2006 – 2009.

Disadvantages of the Jaguar AJ34 engine

  • The weak point of this engine is the unreliable phase regulators of the VVT type;
  • The motor is aluminum and is afraid of overheating, so keep an eye on the cooling system;
  • The crankcase ventilation valve clogs rather quickly, which leads to high oil consumption;
  • The search for the culprit of floating engine speeds should start with cleaning the throttle assembly;
  • On long runs, antifreeze leaks often occur due to burst pipes.

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