# BMW M47
The **BMW M47** is a family of 2.0-liter four-cylinder turbocharged diesel engines produced by BMW from 1998 to 2007 and used in the 3 Series (E46, E90), 5 Series (E39, E60), 1 Series (E87), X3 (E83), and, in adapted form, the [Rover 75](https://www.edgepedia.org/rover-75), MG ZT, and first-generation [Land Rover Freelander](https://www.edgepedia.org/land-rover-freelander).[1](https://cargeek.org/engines/bmw-m47) • [2](https://otoba.ru/dvigatel/bmw/m47.html) It was BMW's return to a four-cylinder diesel after the 1.7-liter 318tds of 1994, and it carried the company's diesel line until the N47 replaced it in 2007.[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376) • [4](https://web.uni-miskolc.hu/dms/docs/dms_vol12_nr2_2022.pdf)
| Key fact | Detail |
|---|---|
| Configuration | 2.0-liter inline-4 turbo diesel, cast iron block, alloy cylinder head, chain-driven double overhead camshafts, four valves per cylinder, exhaust gas recirculation[5](https://australiancar.reviews/bmw-m47-engine-1999-07/) |
| Production | 1998–2007, built at the Steyr plant in Austria, in three generations: M47, M47TU (M47N), and M47TU2 (M47N2)[2](https://otoba.ru/dvigatel/bmw/m47.html) |
| Original output | M47D20, 1951 cc, 100 kW/136 hp at 4,000 rpm, 280 Nm, direct injection with a high-pressure distributor pump[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376) • [6](https://www.bmwgroup-classic.com/en/models/bmw-classics/product-description-page.ad-90-1.bmw-320d-e46.html) |
| 2001 update | M47D20TÜ: 1995 cc, 110 kW/150 hp, 330 Nm, second-generation common rail at 1,600 bar with up to five injection stages per power stroke[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376) |
| Top output | M47TU2 from 2004: 90 kW standard and 120 kW (163 hp) high-output versions, the latter with variable twin turbo-style multi-stage charging in the 120d[5](https://australiancar.reviews/bmw-m47-engine-1999-07/) • [3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376) |
| Signature fault | Inlet manifold swirl flap fasteners loosening and a flap being ingested, causing immediate total failure of the engine and/or turbocharger[7](https://media.carooline.com/media/0089_DOC/DT565_2%28en%29.PDF) |
| Successor | N47, debuted March 2007 in the facelifted 1 Series E87/E81[4](https://web.uni-miskolc.hu/dms/docs/dms_vol12_nr2_2022.pdf) |
## Design of the original M47D20
The first M47D20 entered production in March 1998 in the E46 320d, a car BMW's own archive calls a milestone for its diesel program. [The 1](https://www.edgepedia.org/the-1).95-liter engine with direct injection and an exhaust turbocharger produced 70 hp per liter of displacement, a high specific output for a diesel of its time.[6](https://www.bmwgroup-classic.com/en/models/bmw-classics/product-description-page.ad-90-1.bmw-320d-e46.html) The 1998 press material describes a crankcase stiffened by hollow sections cast into its outer walls, four-valve technology, roller cam followers, and a turbocharger with electrically controlled variable inlet geometry.[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376)
**Fuel injection differed from BMW's six-cylinder diesels.** While the new 1998 inline-six used common-rail direct injection, the four-cylinder M47 was fed by a high-pressure distributor pump, a rotary-pump system rather than a shared rail.[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376) The engine also had a cast iron block, an alloy cylinder head, a forged steel crankshaft, chain-driven double overhead camshafts, and one swirl and one tangential intake port per cylinder.[5](https://australiancar.reviews/bmw-m47-engine-1999-07/)
## The 2001 technical update
In summer 2001 BMW renewed the four-cylinder diesel range. An 85 kW/115 hp version became the entry-level engine in the 318d, while the 320d received a comprehensively revised engine with 110 kW/150 hp and 330 Nm. Displacement grew from 1,951 to 1,995 cc, the crankcase was strengthened yet lighter, two balance shafts were added, and management moved to the fifth-generation DDE (Digital Diesel Electronics) control with an Instant Start System.[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376)
This updated engine, the M47D20TÜ, was described by BMW as the world's first production-car engine with second-generation common-rail direct injection. Injection pressure rose to 1,600 bar, new flow-rate control made fuel cooling unnecessary, and fuel could be injected in up to five stages per power stroke. The revised 320d accelerated from 0 to 100 km/h in 8.9 seconds with EU-cycle consumption of 5.5 liters per 100 km.[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376) The update also introduced swirl flaps to the M47 family.[5](https://australiancar.reviews/bmw-m47-engine-1999-07/)
## M47TU2 and final outputs
From 2004 the M47TU2 raised outputs to 90 kW in the standard version and 120 kW in the high-output version.[5](https://australiancar.reviews/bmw-m47-engine-1999-07/) The 1 Series launched in early 2004 with a 90 kW/122 hp 118d and a 120 kW/163 hp 120d.[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376) In the fifth-generation 3 Series from 2005, the 320d's four-cylinder diesel used second-generation common-rail injection and a variable-geometry turbocharger to deliver 163 hp and 340 Nm.[8](https://www.press.bmwgroup.com/united-kingdom/article/detail/T0232443EN_GB/the-new-bmw-3-series-2015)
## Applications
The M47 powered the E46 318d and 320d, E39 and E60 520d, E87 118d and 120d, E90 318d and 320d, and E83 X3 2.0d.[1](https://cargeek.org/engines/bmw-m47) • [9](https://bimmer.ai/bmw-engines/m47/) BMW's parts catalog lists no US-market vehicle type with an M47 engine code, so the engine served European and other export markets only.[10](https://ia-euro.com/pages/bmw-m47)
**Rover and Land Rover derivatives.** Rover 75 and MG ZT diesel models used the M47R (code 204D2), based on the 1998–2001 M47D20 but mildly de-tuned relative to BMW's outputs; the Freelander used a related version coded 204D3.[11](https://www.75ztcommunity.co.uk/xpdfdocuments/colinNI/buyerguide.pdf) • [2](https://otoba.ru/dvigatel/bmw/m47.html)
The E46 320d established the engine's commercial standing. It delivered 136 bhp, a 128 mph top speed, and 49.6 mpg on the combined cycle, and in 2003 it overtook the 318i as the largest-selling BMW model in the UK. Up to 2005, more than 415,000 examples of the 320d Sedan were produced.[8](https://www.press.bmwgroup.com/united-kingdom/article/detail/T0232443EN_GB/the-new-bmw-3-series-2015) • [6](https://www.bmwgroup-classic.com/en/models/bmw-classics/product-description-page.ad-90-1.bmw-320d-e46.html)
## Swirl flaps and known weaknesses
Swirl flaps are small pivoting plates in the inlet manifold that shape airflow at low engine speeds and loads for emissions control; activating one restricts air to the cylinder much as a throttle does, so they are used only at low speed and light load.[12](https://ora.ox.ac.uk/objects/uuid%3Ae9bd6949-de30-4cca-8dde-b750813a0bda/files/m04ddb5b2201aed0c4fcf309d204366f0) On M47TU and TU2 engines (2001 to 2007), the fasteners securing the flaps can work loose. A detached flap can drop into the engine and turbocharger, and Delphi's technical bulletin states that this will result in immediate and total failure of the engine and/or turbocharger; it advises inspecting every flap and its two screws whenever a turbo has failed from foreign-object impact.[7](https://media.carooline.com/media/0089_DOC/DT565_2%28en%29.PDF) Consequences described by specialists include a ruined piston, valves, and cylinder head, with debris also destroying the turbo and catalyst.[13](https://www.pmwltd.co.uk/swirl_flaps.pdf)
BMW responded in 2006 with stronger swirl flaps and larger-diameter spindles made from plastic.[13](https://www.pmwltd.co.uk/swirl_flaps.pdf) In practice, many owners have had the flaps removed and the manifold ports blanked, a modification worth confirming on any used car because a half-done deletion can leave debris behind.[1](https://cargeek.org/engines/bmw-m47)
**Timing chain placement.** The M47's timing chain sits at the front of the engine, on the accessory side, unlike the rear-mounted layout that later made the N47 notorious.[14](https://becquet-voiture.com/en/blogs/accessoire-performance-voiture/bmw-serie-3-e46-occasion-guide-fiabilite) The M47 suffers chain trouble less often than the N47 and has a different, front-mounted chain layout; replacement accesses the chains through the timing case without requiring gearbox removal, though a start-up rattle can still indicate an expensive repair.[1](https://cargeek.org/engines/bmw-m47) Other routine items are the diesel duty cycle itself: EGR valve clogging, glow plugs, and, on later cars, a particulate filter that struggles to regenerate on short journeys.[1](https://cargeek.org/engines/bmw-m47) With swirl flaps addressed and the turbo and crank pulley rubber monitored, one UK specialist guide judges the engine capable of 250,000 miles.[9](https://bimmer.ai/bmw-engines/m47/)
## Replacement
The M47 was replaced by the N47, which debuted in March 2007 in the facelifted BMW 1 Series E87 and E81 and was justified by the aim of reducing fuel consumption and increasing performance.[4](https://web.uni-miskolc.hu/dms/docs/dms_vol12_nr2_2022.pdf) The 2007 generation change also brought third-generation common-rail direct injection and an aluminum crankcase to BMW's four-cylinder diesels.[3](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376)
## References
1. [BMW M47 engine — specifications, cars fitted and common faults, CarGeek](https://cargeek.org/engines/bmw-m47)
2. [Двигатель BMW M47, Otoba.ru](https://otoba.ru/dvigatel/bmw/m47.html)
3. [BMW Group PressClub, diesel engine history document T0144010IT](https://www.press.bmwgroup.com/italy/article/attachment/T0144010IT/220376)
4. [Design of Machines and Structures, Vol. 12, No. 2 (2022), University of Miskolc](https://web.uni-miskolc.hu/dms/docs/dms_vol12_nr2_2022.pdf)
5. [BMW M47 Engine (1999-07), Australian Car.Reviews](https://australiancar.reviews/bmw-m47-engine-1999-07/)
6. [BMW 320d (E46), BMW Group Classic](https://www.bmwgroup-classic.com/en/models/bmw-classics/product-description-page.ad-90-1.bmw-320d-e46.html)
7. [Swirl Flap Fault, Delphi Technical Information DT565/2(EN)](https://media.carooline.com/media/0089_DOC/DT565_2%28en%29.PDF)
8. [The new BMW 3 Series 2015, BMW Group PressClub UK](https://www.press.bmwgroup.com/united-kingdom/article/detail/T0232443EN_GB/the-new-bmw-3-series-2015)
9. [BMW M47 Engine Reliability Guide, Bimmer.AI](https://bimmer.ai/bmw-engines/m47/)
10. [BMW M47 Engine Guide, IA Euro](https://ia-euro.com/pages/bmw-m47)
11. [A history of the M47R, Rover 75/MG ZT Owners Club buyer guide](https://www.75ztcommunity.co.uk/xpdfdocuments/colinNI/buyerguide.pdf)
12. [Swirl flaps and in-cylinder air motion, Oxford Research Archive](https://ora.ox.ac.uk/objects/uuid%3Ae9bd6949-de30-4cca-8dde-b750813a0bda/files/m04ddb5b2201aed0c4fcf309d204366f0)
13. [Swirl Flaps, PMW Ltd technical paper](https://www.pmwltd.co.uk/swirl_flaps.pdf)
14. [Bmw Serie 3 E46 Occasion Guide Fiabilite, becquet-voiture.com](https://becquet-voiture.com/en/blogs/accessoire-performance-voiture/bmw-serie-3-e46-occasion-guide-fiabilite)
---
*Topic: Encyclopedia › Technology and the built world › Engineering and manufacturing › Mechanical engineering › Piston engines and engine families*
*Initially written Sep 17, 2026 · Reviewed: Sep 30, 2026; Oct 15, 2026 · Edited: Oct 15, 2026 · Last review: Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license