The V6 series of Audi EA330 2.5 TDI diesel engines was assembled by the company from 1997 to 2005 and installed on many of the concern’s models with a longitudinal arrangement of the power unit. These diesel engines are conditionally divided into two lines, popularly called the A-series and B-series.
For the first time, V-shaped 6-cylinder 2.5 TDI diesel engines appeared in 1997 on the Audi A8 model. These were engines with a cast-iron cylinder block, two aluminum cylinder heads and a timing belt. The popular Bosch VP44 injection pump was responsible for the direct injection of diesel fuel.
Each cylinder head had two camshafts, which controlled 24 valves in total, and the presence of hydraulic lifters made it possible to avoid the frequent procedure for adjusting their clearance.
The first line of power units included four diesel engines of different power:
Already in 2003, an updated series of 2.5 TDI diesel power units was introduced. First of all, the problematic gas distribution mechanism of the motor underwent modernization: the camshaft cam now pressed on the roller bearing, which increased the life of the rockers.
The engine with the BFC index, which was produced from 2002 to 2003, does not, in fact, belong to the B-series, since it has an old-style gas distribution mechanism. Plus, it’s very rare.
These engines were installed on numerous models of Audi, Volkswagen, Skoda until 2005:
The 2.5-liter Audi AFB 2.5 TDI diesel engine was assembled by the company from 1997 to 1999 and installed on such popular models as the A4 B5, A6 C5, A8 D2 and Volkswagen Passat B5. After upgrading to more modern environmental standards EURO 3, the diesel engine changed its index to AKN.
The 2.5-liter Audi AKE 2.5 TDI engine was produced by the German concern from 1999 to 2005 and was installed on the company’s most popular models, such as the A4 B6, A6 C5 or A8 D2. This power unit is the only one from the A-series, which was assembled in parallel with the B-series.
The 2.5-liter Volkswagen AKN 2.5 TDI diesel engine was produced from 1999 to 2003 and was installed on the popular Passat B5, as well as Audi A4 B5, A6 C5 and A8 D2 models. This power unit is essentially a version of the well-known AFB engine updated to EURO 3.
The 2.5-liter Audi AYM 2.5 TDI engine was produced by a German company from 2001 to 2003 and was installed on such popular concern models as the A4 B6, A6 C5, and also the Skoda Superb. This unit, in its design, was transitional between the motors of the A-series and B-series.
The 2.5-liter Audi BAU 2.5 TDI diesel engine was assembled by the company from 2003 to 2005 and belonged to the updated B-series, that is, the timing rockers are equipped with special rollers. This unit was most often found under the hood of such popular models as the A4 B6 and A6 C5.
The 2.5-liter Audi BDG 2.5 TDI diesel engine was produced by the concern from 2003 to 2008 and was installed on such popular company models as the A4 B7, A6 C5 or Volkswagen Passat B5. Thanks to the installation on the Skoda Superb, this diesel engine was assembled the longest in its family.
The 2.5-liter diesel engine Volkswagen BDH 2.5 TDI was produced from 2004 to 2006 and was installed on the Passat B5, as well as such Audi models as the A6 C5 and the convertible based on the A4 B6. This power unit is essentially an updated version of the famous BAU engine to EURO 4.
