BMW M47

The BMW M47 and Rover Group M47R are straight-4 Diesel engines. Variants were manufactured by BMW from 1998 to 2007. BMW gradually adopted high-pressure common rail fuel injection systems over the lifetime of the M47.

M47D20
The original M47 diesel engine featured non-common-rail direct fuel injection and a 1951 cc block. First seen in 1998, the M47D20 produced 100 kW and 280 Nm in its original 320d/520d guise, and 85 kW with 265 Nm in the 318d variant. All M47 engines have one Swirl and one Tangential intake port per cylinder, which can each improve performance under different conditions. These features are not to be confused with swirl flaps, which were introduced in the M47D20TÜ.

Applications:
 * 85 kW and 265 Nm
 * 2001–2003 E46 318d
 * 100 kW and 280 Nm
 * 1999–2001 E46 320d
 * 2000–2003 E39 520d

M47R
Rover Group (UK) and Steyr (Austria), worked together to modify the M47D20 to create a transverse configuration for use in the Rover 75 front wheel drive saloon, as well as their all-wheel-drive Land Rover Freelander. The same engine was later deployed by MG Rover in the Rover 75 Tourer and MG ZT. The M47R ("M47 Rail") differs from the original design by the introduction of common-rail technology, a transverse orientation, different turbochargers and more sophisticated systems for temperature management. However, the core 1951 cc heads of the M47R and M47D20 are the same. Combining a common-rail system with a relatively small engine capacity created engine temperature problems. More hardware was added to help control temperatures which also helped to escalate weight, fuel consumption, and manufacturing costs. The BMW Steyr plant manufactured and supplied M47R engines. The original version used in the Rover 75 developed 85 kW at 4000rpm and 260 Nm at 2000rpm. A software update developed in conjunction with X Power, and released in 2002 after Rover's separation from BMW, increased this to 96 kW at 3500rpm and 300 Nm at 1900rpm, and was badged CDTi rather than CDT.

The M47R in the Rover 75 and MG ZT used a Mitsubishi turbocharger with wastegate, whereas that fitted to the Freelander used a Garrett VNT.

Applications:
 * 1999–2004 Rover 75 CDT
 * 2002–2005 Rover 75 CDTi
 * 2001–2006 Land Rover Freelander
 * 2001–2004 MG ZT CDT
 * 2002–2005 MG ZT CDTi

M47D20TÜ
The all wheel drive BMW X3 and rear-wheel drive BMW 320d models, built approximately between September 2001 and December 2004, were fitted with the M47TÜ ("M47 Technical Update"). The exact production week is not known and was probably later than Production Week 33 in 2001 (e.g. one cannot rely on a UK 51 plate registered BMW 320d to have the M47TU).

The engine capacity was expanded to 1995 cc, and it retained the common-rail injector system that had proven popular in the smaller M47R and larger M57 engines. These changes empowered BMW to increase torque and improve fuel consumption, especially at lower revs. However, these modifications added 50 kg to overall weight and emissions raised accordingly. In the UK, the new characteristics of the M47TÜ were sufficient to lift the BMW 320d into the next highest insurance bracket, and the next highest band for Vehicle Excise Duty (Road Tax).

The M47TÜ was regarded as so good that BMW made it available in the 320Cd Coupé.

The M47D20TÜ introduced new common failure points. Chief among these was a new 'swirl flap' mechanism embedded in the inlet manifold. This consisted of a number of butterfly valves within each individual inlet tract, which are secured to an actuating rod via two small screws. It has become clear that over time these screws can come loose via vibration etc. When this happens they can end up being drawn into the respective cylinder, causing significant damage to the piston, cylinder head, and valves. If unlucky further damage can be caused to the turbo if the screw then makes its way through the exhaust valve into the manifold and subsequently into the turbo. These failures have occurred in such quantity that a number of specialist BMW magazines have featured articles on the problem including information on how to remove the swirl flaps. For those who wish to perform some preventive maintenance on the M47TUD20 engine, there are companies who supply and/or fit blanking plugs to allow the removal of these swirl flaps altogether. BMW addressed the problem by introducing stronger swirl flaps and larger diameter spindles – made from plastic – in 2006.

Applications:
 * 85 kW and 280 Nm
 * 2003–2005 E46 318d
 * 110 kW and 330 Nm
 * 2001–2005 E46 320d
 * E83 X3 2.0d (up to end of 2006)

M47D20TÜ2
The engine was updated again in 2004 as the M47D20TÜ2 (for Technische Überarbeitung 2 = second revision). Still at 1995 cc, it produced more power across the range.

Applications:
 * 90 kW and 280 Nm
 * E87 118d
 * E90/E91 318d
 * 120 kW and 340 Nm
 * E60/E61 520d
 * E87 120d
 * E90/E91 320d
 * E83 X3 2.0d (end of 2006 onwards)