|BMW N53 engine|
|Manufacturer||BMW, Bayerische Motoren Werke AG|
|Successor||BMW N20, BMW N55|
BMW never sold the N53 engine in North American, Australian and Malaysian vehicles, due to the high sulphur content of the fuel available in these markets. These regions continued to use the N52 port-injected naturally-aspirated and N54 direct-injection twin-turbo inline-6 engines for the 2007-2011 model years.
The N53 is the final naturally aspirated straight-6 engine produced by BMW, ending a history of continuous production of this engine configuration since the M30 in 1968. The N53 was replaced by the N20 turbocharged straight-4 engine in 2011.
Compared with its N52 predecessor which was port-injected, the N53 uses direct injection (consisting of piezoelectric injectors directly in the cylinder) with a stratified lean mixture operation. The N53 has variable valve timing on both camshafts (called double vanos by BMW) and a magnesium alloy block. Unlike the N52, the N53 does not contain variable valve lift (called valvetronic by BMW), due to space limitations in the cylinder head.
|N53B25-U0||2,497 cc (152 cu in)||140 kW (190 hp) @ 6100 rpm||235 N·m (173 lb·ft) @ 3500-5000 rpm||82.0||78.8||12.0||2007|
|N53B30||2,996 cc (183 cu in)||150 kW (200 hp) @ 6700 rpm||270 N·m (200 lb·ft) @ 1500-4250 rpm||85.0||88.0||12.0||2010|
|N53B30-U0||160 kW (210 hp) @ 6100 rpm||270 N·m (200 lb·ft) @ 2400-4200 rpm||85.0||88.0||12.0||2007|
|N53B30||200 kW (270 hp) @ 6100 rpm||310 N·m (230 lb·ft) @ 1600-4250 rpm||85.0||88.0||12.0||2010|
|N53B30-O0||200 kW (270 hp) @ 6700 rpm||320 N·m (240 lb·ft) @ 2750-3000 rpm||85.0||88.0||12.0||2007|
- 2006-2010 E60/E61 523i
The N53B30-O0 increased power to 200 kW (270 hp) and torque to 320 N·m (240 lb·ft).
The N53 engine shares the High Pressure Fuel Pump with the N54 series of engine and has suffered from the same problems. BMW in Europe have not had to purchase cars under Lemon Laws as they have in the US market, . The N53 engine was not sold in the USA, therefore not subject to the same class action legal threats and buy-backs as detailed below on the N54 engine. In the US BMW have extended the fuel pump warranty to 10 years , BMW Europe have not offered any extension to warranty or goodwill gestures.
In at least the US market, the N54 engine has been characterized by a very large number of High Pressure Fuel Pump (HPFP) failures, leading to BMW North America vehicle Lemon Law "buy backs" and reduced customer goodwill. BMW's failure to solve the HPFP problem has led to serious safety concerns over dangerous sudden losses of power at highway speeds. Reports of drivers being stranded are not uncommon and some have accused BMW of actively concealing the problem rather than addressing it.
In April 2009, a class action suit was filed against BMW in connection with HPFP failures. BMW settled the suit in June 2010. On 26 October 2010, following an ABC News story about HPFP failures, BMW announced a recall of vehicles with the pump in question from manufacturing years 2007-2010.
Direct Fuel Injectors
Direct injection is used within the N53 engine. With fuel avoiding the inlet manifold carbon can build up requiring this to be cleaned. Injector failure is also common, causing either rough running, engine faults or general loss in power.
Each cylinder has an individual coil to create a spark for the plug. These are known to be prone to failure
Extended BMW Warranty
Due to many quality failures by BMW for the sister N54 engine, they have been forced for the United States market to extend the warranty on the High Pressure Fuel Pump and also the Injectors to 10 years.  Owners in other regions do not receive any warranty extension.
Even though many of the failure prone parts are shared between the N53 and N54 engines, no such extension is being offered for the N53 engine by BMW as it was not sold in the United States.
- "BMW's N52 versus N53 - what are we missing?". paultan.org.
- http://metric.or.kr/Common/download/download_file.asp?dpath=thesis&fname=car-j-1906-0082.pdf[dead link]
- "BMW N53B25 Engine". mywikimotors.com.
- "BMW Straight 6 Engine - N Series". BMWInformation.com. Archived from the original on 21 April 2008.
- "Engine specifications for N53 engines". www.bmwheaven.com.
- "BMW Engine Codes". racingdynamics.com.
- "What's the deal with all these Lemon/Buyback 335i's?". www.bimmerfest.com.
- "High Pressure Fuel Pump now covered under 10 year warranty". www.e90post.com.
- "Kershaw, Cutter & Ratinoff takes on BMW in class action suit regarding defective HPFP". www.bimmerfest.com.
- Cohan, Peter. "BMW's Engine Problems: A Safety Risk to Drivers – and the Company?". DailyFinance. Retrieved 2010-09-13.
- "Jay Alan Morane vs BMW North America- April 10 2009". www.scribd.com.
- "ABC News airs big expose on BMW N54 engine problems, lawsuits". www.autoblog.com.
- Consumerist: BMW Recalls 150,000 Cars Over Fuel Pump Failures
- "N53 330i Powweerrr loss". http://www.e90post.com. External link in
- "N53 330i - still suffering". https://www.pistonheads.com. External link in
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