Engine Jaguar AJ27

The Jaguar AJ27 4.0-liter V8 petrol engine was produced by the company from 1998 to 2003 and was installed on the main modifications of the XJ8 sedan in the X308 body and the XK coupe in the X100 body. In addition to the 4.0-liter engine, there was a simplified 3.2-liter version without a phase regulator.

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


Production years 1998-2003
Displacement, cc 3996
Fuel system distributed injection
Power output, hp 290 (4.0 liters)
240 (3.2 liters)
Torque output, Nm 393 (4.0 liters)
316 (3.2 liters)
Cylinder block aluminum V8
Block head aluminum 32v
Cylinder bore, mm 86
Piston stroke, mm 86 (4.0 liters)
70 (3.2 liters)
Compression ratio 10.75 (4.0 liters)
10.5 (3.2 liters)
Features DOHC
Hydraulic lifters no
Timing drive chain
Phase regulator VVT at the intake (4.0 liters)
no (3.2 liters)
Turbocharging no
Recommended engine oil 5W-30
Engine oil capacity, liter 7.3
Fuel type petrol
Euro standards EURO 2/3
Fuel consumption, L/100 km (for Jaguar XJ8 2000)
— city
— highway
— combined
Engine lifespan, km ~400 000

The engine was installed on:

  • Jaguar XJ 6 (X308) in 1998 – 2003;
  • Jaguar XK 1 (X100) in 1998 – 2002.

Disadvantages of the Jaguar AJ27 engine

  • At first, the engines were coated with nikasil and were very afraid of bad fuel.
  • In 1999, the coating was replaced by cast iron sleeves and the problem with its shedding was gone.
  • The timing chain is not very large resource, sometimes even less than 100,000 km.
  • The aluminum unit is afraid of overheating, so keep an eye on the condition of the radiators.
  • Other problems here are related to sensor glitches and leaks of lubricant or antifreeze.

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