09-12 BMW 550i 750i X5 X6 4.4L Twin Turbo N63B44 Crankshaft Assembly N63 5421
09-12 BMW 550i 750i X5 X6 4.4L Twin Turbo N63B44 Crankshaft Assembly N63 5421
Item Details
VIN must be 17 characters and cannot contain I, O, or Q.
Item Description
09-12 BMW 550i 750i X5 X6 4.4L Twin Turbo N63B44 Crankshaft Assembly N63 5421
Crankshaft from a 2010 BMW 750i with the N63B44A 4.4L twin turbocharged engine. This has been cleaned and inspected and appears to be in good used condition. The rod journals measure out to 54mm and the main journals measure out to 65mm, which is within the OEM specifications for this crankshaft. The journals have minor wear from use, but look very nice overall with no gouges, pitting or deep scratches. All threaded holes are in good condition with no damage. With all our used engine parts it is recommended to have this checked by a professional machinist prior to use, as it may need polishing or other attention. This crankshaft comes exactly as pictured. The images are of the actual item you will receive.
Original equipment from the following vehicles with N63B44 4.4L twin turbocharged engine built before 03/11:
• 2011-2013 BMW 550i
• 2010-2012 BMW 550i GT
• 2012 BMW 650i
• 2009-2012 BMW 750i and 750Li
• 2011-2013 BMW X5
• 2008-2014 BMW X6
No shipping outside the lower 48 states. No P.O. Boxes.
Importapart is an auto recycler based in Hazelwood, Missouri. Every part we sell is a real, inspected OEM piece pulled from our own inventory — no aftermarket guesswork.
Questions on fitment or availability? Email Importapartsales@gmail.com or reach us through our contact page and we’ll get back to you within one to two business days. Hours are Mon–Fri, 9am–5pm CST.
We accept all major credit and debit cards and the other payment methods shown at checkout, processed securely through Shopify. Payment is due in full at the time of purchase, and sales tax is applied where required.
For programmed ECU/ECM/PCM orders, be sure to submit your VIN, odometer reading, and current part number at checkout so we can program the unit before it ships.
We ship to all 50 states. Most orders leave our Hazelwood, MO shop within 1–2 business days by FedEx, UPS, or USPS, and you’ll get tracking by email as soon as it’s on the way.
Heavy items like engines, transmissions, and body panels may ship freight — we note that on the listing when it applies. Alaska and Hawaii have a flat-rate surcharge calculated at checkout. We don’t ship to PO Boxes or outside the U.S.
Local pickup is available at our Hazelwood facility by appointment — call ahead to set a time.
Returns are accepted within 60 days. A 20% restocking fee applies to standard returns, but it’s waived if we sent the wrong part, it arrived damaged, or it’s verified defective. Inspect your order on arrival and contact us within 7 days in those cases — we cover return shipping.
Programmed ECU/ECM/PCM modules are returnable only if defective, damaged, or incorrect. Because each one is programmed to the VIN you provide, we can’t take them back for compatibility issues from an incorrect VIN, odometer, or part number — double-check before you order.
Approved refunds are issued to your original payment method within 10 business days.
Every part carries a 60-day limited warranty against defects from the date it’s delivered. It covers manufacturing defects, parts that fail to function as described, and internal mechanical or electrical failure under normal use.
Not covered: damage from improper installation, accident, misuse, or modification; normal wear and tear; labor, towing, or rental costs; racing, off-road, or commercial use unless stated; and items with broken warranty seals.
To file a claim, email Importapartsales@gmail.com with your order number, a description of the problem, and photos or video if possible. We’ll respond within one business day.
Compatible Vehicles
| Notes | Make | Model | Year | Trim | Engine |
|---|---|---|---|---|---|
| Bmw | x6 | 2014 | m sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2014 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2014 | xdrive50i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2014 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 550i | 2013 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 550i | 2013 | m sport sedan 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | 550i | 2013 | top sedan 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2013 | m sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2013 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x5 | 2013 | xdrive30i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2013 | xdrive35i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2013 | xdrive50i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2013 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2013 | m sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2013 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2013 | xdrive50i m performance sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2013 | xdrive50i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2013 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 550i | 2012 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 650i | 2012 | base convertible 2-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | 650i | 2012 | base convertible 2-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 650i | 2012 | base coupe 2-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | 650i | 2012 | base coupe 2-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 650i | 2012 | m sport convertible 2-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | 650i | 2012 | m sport coupe 2-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | 650i xdrive | 2012 | base convertible 2-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 650i xdrive | 2012 | base coupe 2-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x5 | 2012 | m sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2012 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x5 | 2012 | xdrive30i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2012 | xdrive35i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2012 | xdrive50i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2012 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2012 | m sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2012 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2012 | xdrive50i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2012 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 550i | 2011 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x5 | 2011 | m sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2011 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x5 | 2011 | xdrive30i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2011 | xdrive35i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x5 | 2011 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2011 | activehybrid sport utility 4-door | 4.4l 4395cc v8 full hybrid ev-gas (fhev) dohc turbocharged | |
| Bmw | x6 | 2011 | m sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2011 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2011 | xdrive50i sport utility 4-door | 4.4l 4395cc 268cu. in. v8 gas dohc turbocharged | |
| Bmw | x6 | 2011 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 550i gt | 2010 | base hatchback 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 550i gt xdrive | 2010 | base hatchback 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 750i | 2010 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 750i xdrive | 2010 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 750li | 2010 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 750li xdrive | 2010 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2010 | m sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2010 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2010 | xdrive50ia sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 750i | 2009 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | 750li | 2009 | base sedan 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2009 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2009 | xdrive50ia sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged | |
| Bmw | x6 | 2008 | xdrive50i sport utility 4-door | 4.4l 4395cc v8 gas dohc turbocharged |