| BMW N47 engine | |
| Manufacturer: | BMW |
| Production: | March 2007 - September 2014 |
| Predecessor: | BMW M47 |
| Successor: | BMW B37 (D16, 1.6L), BMW B47 (D20, 2.0L) |
| Configuration: | Straight-4 |
| Displacement: | 1598cc 1995cc |
| Bore: | 78mm 84mm |
| Stroke: | 83.6mm 902NaN2 |
| Fueltype: | Diesel fuel (DIN EN 590) |
| Fuelsystem: | Common rail direct injection |
| Coolingsystem: | Water-cooled |
| Turbocharger: | Variable-geometry turbocharger sequential twin-turbo (some versions) |
| Power: | NaNkW |
| Torque: | NaN0NaN0 |
| Compression: | 16.1:1-16.5:1 |
| Emissions Control: | EGRDPF |
BMW N47 is a four-cylinder common rail diesel engine that has many improvements over its predecessor, the M47. In 2014 it was replaced with the B47. The USA market never received B47 engine. The only B diesel engine in the US received was the B57 (6 cyl) in the 2018 model 540d. The newest 4 cylinder diesel in the US was N47TU.
The N47 engine debuted in March 2007 in the facelifted 1 Series BMW E87 and E81 and was available in the 1 Series BMW E82 and E88, which were introduced later in the same year.
The engine also became available in the 5 Series BMW E60 and E61 from September 2007, several months after the 5 series was face lifted, during which time the older M47 remained available.
In the 2008 model year 3 Series E90/E91/E92/E93 when the entire 3 series range gained the company's Efficient Dynamics technology. Not long after it became available in the X3 and has since then became available in the X1.
The N47 comes as a 1598cc (D16) and 1995cc (D20) unit, the latter identical in capacity to the M47TU/TU2 series.
The 70kW tune was used in the F20 114d.
The 85kW tune was used in the F20 116d EfficientDynamics version.
It features the exact same performance figures on paper as the regular 116d (which utilises the D20 in an 85 kW variant) despite the smaller engine size.
The 85kW tune is for the entry level E81 F20 and E87 116d, as well as the entry level 3 Series E90 316d. It was also used in the 3 Series F30 316d.
The 105kW model was used in the following:
A new 120kW 3600NaN0 derivative was introduced in September 2009 for the 2010 model year. This version featured exceptionally low emissions of only 109g/km and fuel consumption of 68.9 mpg.[1]
This version was used in the E90 BMW 320d Efficient Dynamics and 520d F07/F10/F11.
The "standard" x20d model has extra power, producing 130kW but 70NaN0 of torque less at 3500NaN0. This is found in the
In Europe, this particular version is one of the most popular engines in the entire range; the best selling 3 series is the 320d, while the 520d is the UK's best selling 5 series.[2]
The updated version of this engine introduced in March 2010 produces 135kW at 4000 rpm and 3800NaN0 at 1750-2750 rpm.
In October 2007, BMW introduced a twin sequential turbo model. With 1500NaN0, it is the first production diesel on sale to achieve a specific output of over 100hp per liter. It uses the same turbo technology first shown in the E60 535d.
The 150kW model was used in the
Later, the engine received an update which boosted the output to 160kW and was used on these models:
| Engine | Displacement | Compression Ratio | Power | Torque | Years |
|---|---|---|---|---|---|
| N47D16 | 1598cc | 16.5:1 | 70kW at 4000 rpm | 2350NaN0 at 1500-2750 rpm | 2013 |
| 85kW at 4000 rpm | 2600NaN0 at 1500-2750 rpm | 2012 | |||
| N47D20 | 1995cc | 16.5:1 | 85kW at 4000 rpm | 2600NaN0 at 1750 rpm | 09/2009 |
| 105kW at 4000 rpm | 3000NaN0 at 3000 rpm | 03/2007 | |||
| 120kW at 4000 rpm | 3400NaN0 at 2000 rpm | 09/2009 | |||
| 130kW at 4000 rpm | 3500NaN0 at 3000 rpm | 03/2007 | |||
| 135kW at 4000 rpm | 3800NaN0 at 2750 rpm | 03/2010 | |||
| 16.1:1 | 150kW at 4400 rpm | 4000NaN0 at 2000 rpm | 03/2010 | ||
| 16.5:1 | 160kW at 4400 rpm | 4500NaN0 at 2500 rpm | 2011 | ||
The N47 engine family is prone to excessive timing chain wear and premature failure.[3] Rattling noise from the rear of the engine is indicative of the condition. Timing chain failure may call for engine replacement or a costly repair. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009.[4] However, there have been reports of timing chain failure in BMW diesel engines manufactured until 2011. At times the failure has resulted in a dangerous cut out of the engine while the vehicle was being driven - sometimes at relatively high speed. A "Quality Enhancement" was issued by BMW for some, but not all vehicles, but has since been discontinued.
The return spring on the turbo's wastegate was not originally lubricated or covered, this frequently resulted in early failure causing the waste-gate to remain partially or fully open. With the subsequent loss in compression, fuel consumption increased by 30–50%. The problem was described by BMW engineers as a "known fault" and was immediately repaired (BMW mobile engineers even carried boxes of an improved spring), however BMW refused to compensate customers for the excessive fuel consumption and denied this fault was their liability.
As the cars equipped with this engine are coming of age, some hoses in the engine bay can start to break down. This is not to be ignored, even though this does not illuminate the CEL, it just sets a code in the ECU. If the vacuum hose supplying the EGR cooler bypass valve gets a hole rubbed in it, or breaks down from old age and oil spray, the EGR cooler won't get bypassed during the engine warmup period. This causes excessive buildup in the cooler matrix, and when the engine warms up these solid chunks of buildup can detach from the EGR cooler and get sucked into the plastic intake tube, melting holes in the intake tube, causing a massive boost leak and in very rare cases an engine fire. BMW has issued a recall to over 1.6 million vehicles in 2018 for the EGR issues.[5]