| BMW N47 engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | BMW |
| Production | March 2007 - September 2014 |
| Layout | |
| Configuration | Straight-4 |
| Displacement | 1.6 L (1,598 cc) 2.0 L (1,995 cc) |
| Cylinder bore | 78 mm (3.1 in) 84 mm (3.3 in) |
| Piston stroke | 83.6 mm (3.29 in) 90 mm (3.54 in) |
| Compression ratio | 16.1:1-16.5:1 |
| Combustion | |
| Turbocharger | Variable-geometry turbochargersequential twin-turbo (some versions) |
| Fuel system | Common raildirect injection |
| Fuel type | Diesel fuel (DIN EN 590) |
| Cooling system | Water-cooled |
| Output | |
| Power output | 70–160 kW (94–215 hp) |
| Torque output | 235–450 N⋅m (173–332 lb⋅ft) |
| Emissions | |
| Emissions control systems | EGRDPF |
| Chronology | |
| Predecessor | BMW M47 |
| Successor | BMW B37 (D16, 1.6L),BMW B47 (D20, 2.0L) |
BMW N47 is a four-cylinder common rail diesel engine that has many improvements over its predecessor, theM47. In 2014 it was replaced with theB47. 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 facelifted1 Series BMW E87 and E81 and was available in the1 Series BMW E82 and E88, which were introduced later in the same year.
The engine also became available in the5 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 year3 Series E90/E91/E92/E93 when the entire 3 series range gained the company'sEfficient Dynamics technology. Not long after it became available in theX3 and has since then became available in theX1.
The N47 comes as a 1.6 L; 97.5 cu in (1,598 cc) (D16) and 2.0 L; 121.7 cu in (1,995 cc) (D20) unit, the latter identical in capacity to the M47TU/TU2 series.
Toyota also used the 1.6 and 2.0 in many of their European spec vehicles and refers to it as theWW Engine.
The 70 kW (94 hp) tune was used in theF20 114d.
The 85 kW (114 hp) tune was used in theF20 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 85 kW (114 hp) tune is for the entry levelE81F20 andE87 116d, as well as the entry level3 Series E90 316d. It was also used in the3 Series F30 316d.
The 105 kW (141 hp) model was used in the following:
A new 120 kW (161 hp) 360 N⋅m (266 lb⋅ft) derivative was introduced in September 2009 for the 2010model year. This version featured exceptionally low CO2 emissions of only 109 g/km (6.2 oz/mi) andfuel consumption of 68.9 mpg[clarification needed].[1]
This version was used in theE90 BMW 320d Efficient Dynamics and520d F07/F10/F11.
The "standard" x20d model has extra power, producing 130 kW (174 hp) but 7 lb⋅ft (9 N⋅m) of torque less at 350 N⋅m (258 lb⋅ft). 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 135 kW (181 hp) at 4000 rpm and 380 N⋅m (280 lb⋅ft) at 1750-2750 rpm.
In October 2007, BMW introduced atwin sequential turbo model. With 150 kW (201 hp), it is the first production diesel on sale to achieve a specific output of over 100 hp (75 kW) per liter. It uses the same turbo technology first shown in theE60 535d.
The 150 kW (201 hp) model was used in the
Later, the engine received an update which boosted the output to 160 kW (215 hp) and was used on these models:
| Engine | Displacement | Compression Ratio | Power | Torque | Years |
|---|---|---|---|---|---|
| N47D16 | 1.6 L (1,598 cc) | 16.5:1 | 70 kW (94 hp) at 4000 rpm | 235 N⋅m (173 lb⋅ft) at 1500-2750 rpm | 2013 |
| 85 kW (114 hp) at 4000 rpm | 260 N⋅m (192 lb⋅ft) at 1500-2750 rpm | 2012 | |||
| N47D20 | 2.0 L (1,995 cc) | 16.5:1 | 85 kW (114 hp) at 4000 rpm | 260 N⋅m (192 lb⋅ft) at 1750 rpm | 09/2009 |
| 105 kW (141 hp) at 4000 rpm | 300 N⋅m (221 lb⋅ft) at 3000 rpm | 03/2007 | |||
| 120 kW (161 hp) at 4000 rpm | 340 N⋅m (251 lb⋅ft) at 2000 rpm | 09/2009 | |||
| 130 kW (174 hp) at 4000 rpm | 350 N⋅m (258 lb⋅ft) at 3000 rpm | 03/2007 | |||
| 135 kW (181 hp) at 4000 rpm | 380 N⋅m (280 lb⋅ft) at 2750 rpm | 03/2010 | |||
| 16.1:1 | 150 kW (201 hp) at 4400 rpm | 400 N⋅m (295 lb⋅ft) at 2000 rpm | 03/2010 | ||
| 16.5:1 | 160 kW (215 hp) at 4400 rpm | 450 N⋅m (332 lb⋅ft) at 2500 rpm | 2011 |
The N47 engine family is prone to excessivetiming 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 2015. 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'swastegate 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 boost, 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 theCEL, it just sets a code in theECU. If the vacuum hose supplying theEGR cooler bypass valve gets a hole rubbed in it, or breaks down from old age and oil spray, theEGR 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 theEGR 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]