Already in 2003, an updated series of 2.5 TDI diesel power units was presented. First of all, the problematic timing mechanism of the engine was modernized: the camshaft cam now pressed on a roller bearing, which increased the life of the rockers.
Produced from 2002 to 2003, the engine with the index BFC in fact does not belong to the B-series, as it has an old-style timing mechanism. Besides, it is very rare.
These engines were put on numerous models of Audi, Volkswagen, Skoda up to 2005:
2.5 TDI (2496 cm³ 78.3 × 86.4 mm)
- BAU 24V direct injection 180 hp. 370 Nm
- BCZ 24V direct injection 163 hp. 310 Nm
- BDG 24V direct injection 163 hp. 350 Nm
- BDH 24V direct injection 180 hp. 370 Nm
- BFC 24V direct injection 163 hp. 310 Nm
Audi BAU 2.5 TDI
The 2.5-liter diesel engine Audi BAU 2.5 TDI was assembled by the company from 2003 to 2005 and belonged to the updated B-series, that is, timing rockers here are equipped with special rollers. This unit was most often found under the hood of such popular models as A4 B6 and A6 C5.
| Parameter | Value |
|---|---|
| Fine volume | 2496 cm³ |
| Power system | Direct injection |
| Drive power | 180 hp |
| Torque | 370 Nm |
| Cylinder block | Cast-iron V6 |
| Cylinder head | Aluminum 24v |
| Cylinder diameter | 78.3 mm |
| Piston stroke | 86.4 mm |
| Compression ratio | 18.5 |
| Drive Features | 2 x DOHC |
| Hydrocompensators | Yes |
| Transmission timing | Belt |
| Fasoregulator | No |
| Turbocharger | VGT |
| What oil to use | 6.0 liter 5W-30 |
| Fuel type | Diesel |
| Environmental class | Euro 3 |
| Example service life | 300,000 km |
Cars with BAU 2.5 TDI engine
- Audi A4 B6 (8E) – 2003-2004
- Audi A6 C5 (4B) – 2003-2005
- Audi A6 C5 Allroad (4BH) – 1999-2002
- Volkswagen Passat B5 (3B) – 2003-2005
Disadvantages, breakdowns and problems of BAU 2.5 TDI
- Failures of the VP44 electronically controlled fuel injector.
- Hollow camshafts break.
- Oil leaks, especially from under the valve cover.
- Turbine geometry wedge or viscous clutch bearing.
- Wear out hydraulic compensators and pressure reducing valves from bad oil.
Audi BDG 2.5 TDI
The 2.5-liter diesel engine Audi BDG 2.5 TDI was produced by the concern from 2003 to 2008 and was put on such popular models of the company as A4 B7, A6 C5 or Volkswagen Passat B5. Thanks to its installation on Skoda Superb, this diesel engine was assembled for the longest time in its family.
| Parameter | Value |
|---|---|
| Fine volume | 2496 cm³ |
| Power system | Direct injection |
| Drive power | 163 hp |
| Torque | 350 Nm |
| Cylinder block | Cast-iron V6 |
| Cylinder head | Aluminum 24v |
| Cylinder diameter | 78.3 mm |
| Piston stroke | 86.4 mm |
| Compression ratio | 18.5 |
| Drive Features | 2 x DOHC |
| Hydrocompensators | Yes |
| Transmission timing | Belt drive |
| Fasoregulator | No |
| Turbocharger | VGT |
| What oil to use | 6.0 liter 5W-30 |
| Fuel type | Diesel |
| Environmental class | Euro 4 |
| Example service life | 320,000 km |
Cars with BDG 2.5 TDI engine
- Audi A4 B6 (8E) – 2003-2004
- Audi A4 B7 (8E) – 2004-2005
- Audi A6 C5 (4B) – 2003-2004
- Skoda Superb 1 (3U) – 2003-2008
- Volkswagen Passat B5 (3B) – 2003-2005
Disadvantages, breakdowns and problems of BDG 2.5 TDI
- Failures of the VP44 fuel injector.
- Hollow camshafts can collapse.
- Oil leaks, especially from under the valve covers.
- Turbine geometry wedge at high mileage.
- Worn pressure reducing valves and hydrocompensators due to cheap oil.
VW BDH 2.5 TDI (2004-2006)
The 2.5-liter Volkswagen BDH 2.5 TDI diesel engine was produced from 2004 to 2006 and was installed in the Passat B5, as well as such Audi models as the A6 C5 and the A4 B6-based convertible. This power unit is in fact an updated to EURO 4 version of the well-known BAU engine.
| Parameter | Value |
|---|---|
| Fine volume | 2496 cm³ |
| Power system | Direct injection |
| Drive power | 180 hp |
| Torque | 370 Nm |
| Cylinder block | Cast-iron V6 |
| Cylinder head | Aluminum 24v |
| Cylinder diameter | 78.3 mm |
| Piston stroke | 86.4 mm |
| Compression ratio | 18.5 |
| Drive Features | 2 x DOHC |
| Hydrocompensators | Yes |
| Transmission timing | Belt |
| Fasoregulator | No |
| Turbocharger | VGT |
| What oil to use | 6.0 liter 5W-30 |
| Fuel type | Diesel |
| Environmental class | Euro 4 |
| Example service life | 320,000 km |
Cars with BDH 2.5 TDI engine
- Audi A4 B6 Cabrio – 2004-2006
- Audi A6 C5 (4B) – 2004-2005
- Volkswagen Passat B5 (3B) – 2004-2005
Disadvantages, faults and problems of BDH 2.5 TDI
- Failures in the operation of the fuel injector VP44.
- Destruction of hollow camshafts at mileage of 150 – 250 thousand kilometers.
- Oil leaks, especially from under the valve covers.
- Turbine wedge and short life of the viscoflex bearing.
- Failures of hydrocompensators and reducing valves due to low-quality oil.
0 Comments