ALPINA For BMW 2018.09- N55 Precision Forged Steel Engine Crankshaft High Performance Oe 11217589855 11217602973 For Bmw 335i 535i X5 X6 N55 – OEM 11217580483

Product Overview: This crankshaft is a precision-manufactured replacement part for BMW N55 engines, supplied ready for installation. The part is manufactured to original equipment dimensions, making it a practical solution when an original crankshaft has failed through bearing wear, scoring or fatigue cracking. The crankshaft suits 3.0 litre applications and is supplied in STD with a forged steel finish.

Key Features: CNC machining holds the main and rod journals, fillet radii, stroke and end-float to original equipment tolerances for accurate assembly. Journals are ground and micro-polished to a fine surface finish to encourage reliable oil-film formation and reduce bearing wear during cold starts and sustained high load.

Vehicle Compatibility: This part is listed for BMW, covering model families such as For BMW 135i 335i 435i 535i 640i 740i X3 X5 X6. Always check the engine code and the reference number on the original part against the listing to ensure the correct variant is supplied. If the vehicle is not listed, compare the engine code and original part number to identify whether the same component is used.

Specifications: Key specifications: engine code N55; displacement 3.0L; cylinder configuration L6 (Straight-Six); material Forged Steel / Nitrided Steel; size STD; condition New; warranty 12 Months. Measured characteristics include valve train 24V DOHC. Manufacturing is carried out under ISO9001 / TS16949 quality systems.

OEM / Reference Numbers: Reference numbers for this part include 11217580483. Compare these references with the identification marks on the original component to confirm compatibility.

Applications: Applications include complete engine rebuilds, preventative bottom-end renewal and repair of units damaged by lubrication failure. It also suits preventative maintenance programmes where a failed unit is replaced before secondary damage occurs. Holding a standard-size unit in stock helps workshops complete rebuilds without waiting for machining or exchange parts.

Benefits / Replacement Information: Replacing a worn or damaged crankshaft restores smooth rotation, corrects vibration and bearing noise, and helps recover lost oil pressure. Using a new standard-size shaft eliminates the turnaround time and uncertainty of reconditioning the original component. It offers a practical alternative to a main-dealer part at a lower cost without departing from original dimensions.

Installation or Fitment Notes: Before fitting, confirm the part number, measure the main and rod journals, and check the block line bore and bearing tunnel condition. Fit new bearing shells, verify clearances against factory limits, and torque the caps in the specified order. Keep the journals protected until the moment of assembly, and handle the shaft only with clean gloves to avoid surface damage.