The Jaguar AJ25 2.5-liter gasoline engine was produced by the concern from 2001 to 2009 and was installed on the most popular models of the British company, such as the S-Type and X-Type. This motor was essentially one of the varieties of power units of the Duratec V6 family.
AJ-V6 family: AJ20, AJ25, AJ30.
Specifications
| Production years | 2001-2009 |
| Displacement, cc | 2495 |
| Fuel system | distributed injection |
| Power output, hp | 195 – 200 |
| Torque output, Nm | 240 – 250 |
| Cylinder block | aluminum V6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 81.65 |
| Piston stroke, mm | 79.50 |
| Compression ratio | 10.5 |
| Features | DOHC |
| Hydraulic lifters | no |
| Timing drive | chain |
| Phase regulator | on the intake shaft |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 5.9 |
| Fuel type | petrol |
| Euro standards | EURO 3 |
| Fuel consumption, L/100 km (for Jaguar X-Type 2009) — city — highway — combined |
15.0 7.6 10.3 |
| Engine lifespan, km | ~350 000 |
| Weight, kg | 170 |
The engine was installed on:
- Jaguar S-Type 1 (X200) in 2002 – 2007;
- Jaguar X-Type 1 (X400) in 2001 – 2009.
Disadvantages of the Jaguar AJ25 engine
- The unit is quite reliable, but has many rare and expensive parts;
- The main problems are associated with air leaks due to drying gaskets;
- Also, the electrically driven geometry change system often fails in the intake;
- The crankcase ventilation valve here requires regular cleaning or the lubricant will press from all the cracks;
- At high mileage, oil consumption occurs due to the fault of stuck piston rings.
Frequently asked questions about the Jaguar AJ25
How much power does the Jaguar AJ25 make?
The Jaguar AJ25 develops 195 - 200 hp and 240 - 250 Nm of torque.
How much oil does the Jaguar AJ25 take and which one?
Engine oil capacity: 5.9 liters. Recommended oil: 5W-30.
Does the Jaguar AJ25 have a timing belt or chain?
The Jaguar AJ25 uses a timing chain.
Is the Jaguar AJ25 turbocharged?
No, the Jaguar AJ25 is naturally aspirated.
Does the Jaguar AJ25 need valve clearance adjustment?
Yes, there are no hydraulic lifters, so the valve clearances have to be checked and adjusted periodically.
How long does the Jaguar AJ25 last?
The typical lifespan of the Jaguar AJ25 is ~350 000 km with proper maintenance.
What is the fuel consumption of the Jaguar AJ25?
Jaguar X-Type 2009: city 15.0, highway 7.6, combined 10.3 L/100 km.
What cars was the Jaguar AJ25 installed on?
Jaguar S-Type 1 (X200) in 2002 - 2007; Jaguar X-Type 1 (X400) in 2001 - 2009.
What are the common problems of the Jaguar AJ25?
The unit is quite reliable, but has many rare and expensive parts. The main problems are associated with air leaks due to drying gaskets. All known problems.
