Produced between 1998 and 2003, the 2.5-liter Volkswagen AJT 2.5 TDI diesel engine was mounted in the rear of the T4 in the highly popular Transporter family of minibuses. This five-cylinder diesel engine lacked an intercooler and was the weakest in its lineup.
AAB, AJT, ACV, AXG, BAC, BPE, AXD, AXE, AJS, and AYH are also included in the EA153 series.
Specifications
| Production years | 1998-2003 |
| Displacement, cc | 2460 |
| Fuel system | direct injection |
| Power output, hp | 88 |
| Torque output, Nm | 195 |
| Cylinder block | cast iron R5 |
| Block head | aluminum 10v |
| Cylinder bore, mm | 81 |
| Piston stroke, mm | 95.5 |
| Compression ratio | 19.5 |
| Features | SOHC |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | yes |
| Recommended engine oil | 5W-40 |
| Engine oil capacity, liter | 5.5 |
| Fuel type | diesel |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for VW Transporter 1995) — city — highway — combined |
9.9 6.5 7.7 |
| Engine lifespan, km | ~450 000 |
The engine was installed on:
- Volkswagen Transporter T4 (7D) in 1998 – 2003.
Disadvantages of the VW AJT engine
This diesel engine’s primary issues are related to high-pressure fuel pumps or injectors;
The aluminum cylinder head fears overheating and keeps an eye on the cooling system’s integrity;
The timing belt and injection pump belt, along with their rollers, need to be replaced every 100,000 kilometers; during long runs, the vacuum pump frequently knocks and the turbine begins to drive oil; even in older engines, there are numerous electrical issues, particularly with the mass air flow sensor.