Engine Jaguar AJ34S

The 4.2-liter Jaguar AJ34S or 4.2 Supercharged engine was produced from 2006 to 2009 and was installed on the charged modification of the XK model under the XKR index, and for another year on the XFR. This motor is an updated version of the AJ33S and is distinguished by the presence of VVT phase regulators.

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


Production years 2006-2009
Displacement, cc 4196
Fuel system distributed injection
Power output, hp 420
Torque output, Nm 560
Cylinder block aluminum V8
Block head aluminum 32v
Cylinder bore, mm 86
Piston stroke, mm 90.3
Compression ratio 9.1
Features intercooler
Hydraulic lifters no
Timing drive chain
Phase regulator VVT at the intake
Turbocharging Eaton M112
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 XKR 2008)
— city
— highway
— combined
Engine lifespan, km ~300 000

The engine was installed on:

  • Jaguar XF 1 (X250) in 2008 – 2009;
  • Jaguar XK 2 (X150) in 2006 – 2009.

Disadvantages of the Jaguar AJ34S engine

  • The aluminum motor is very afraid of overheating, so keep the radiator clean;
  • VVT phase regulators have a limited resource, sometimes less than 100,000 km;
  • The crankcase ventilation valve clogs quickly, which immediately leads to high oil consumption;
  • Periodic cleaning is required here for the throttle assembly and fuel injectors;
  • At high mileage, antifreeze leaks often occur due to burst pipes.

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