Audi AAT engine
Content
The 2.5-liter Audi AAT 2.5 TDI diesel engine was produced by the company from 1991 to 1997 and was installed only on two models of the concern: with an index of 100 or a similar A6 in the C4 body. This five-cylinder power unit is famous for its high reliability and long service life.
The EA381 series also includes: 1T, CN, AAS, AEL, BJK and AHD.
Specifications of the Audi AAT 2.5 TDI engine
| Exact volume | 2460 cm³ |
| Supply system | direct injection |
| Internal combustion engine power | 115 hp |
| Torque | 265 Nm |
| Cylinder block | cast iron R5 |
| Block head | aluminum 10v |
| Bore | 81 mm |
| Piston stroke | 95.5 mm |
| Compression ratio | 20.5 |
| Features of the internal combustion engine | SOHC, intercooler |
| Hydraulic compensators | Yes |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | Yes |
| What kind of oil to pour | 5.2 liters 5W-40 |
| fuel type | diesel |
| Environmental class | EURO 2 |
| Approximate resource | 550 000 km |
Fuel consumption Audi 2.5 AAT
Using the example of a 6 Audi A1995 with manual transmission:
| City | 8.5 liters |
| Track | 5.4 liters |
| Mixed | 6.8 liters |
Which cars were equipped with the AAT 2.5 l engine
| 100 C4 (4A) | 1991 – 1994 |
| A6 C4 (4A) | 1994 – 1997 |
Disadvantages, breakdowns and problems of AAT
One of the most reliable diesel engines of its time rarely worries its owners
Most of the problems are associated with malfunctions of the Bosch VE37 electronic injection pump
The aluminum head is afraid of overheating, it quickly leads mating surfaces
Replacing a timing belt with rollers is expensive, but it always bends when a valve breaks
At high mileage, the turbine, mass air flow sensor and hydraulic lifters may require replacement
