ALPINA For BMW 2018.09- N55 Forged Steel Engine Crankshaft High Performance 11217589855 11217602973 For Bmw 335i 535i X5 X6 N55 3.0l L6 Parts – OEM 11217580483

Product Overview: This forged steel engine crankshaft is a direct-fit replacement component engineered for BMW N55 engines. 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. It covers 3.0 litre applications and is supplied in STD as a forged steel component.

Key Features: The crankshaft is CNC-machined on precision centres to hold main and rod journal diameters, fillet radii, stroke and end-float within original equipment limits. The journals are ground, hardened and micro-polished so the bearing shells receive a consistent oil film and run quietly from the first start. The shaft is inspected for straightness and journal finish before packing, and is supplied coated in protective anti-rust oil. Fillet rolling at the journal-to-web transitions improves fatigue resistance in the areas most prone to cracking.

Vehicle Compatibility: It fits BMW models including 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.

Specifications: Key specifications: engine code N55; displacement 3.0L; cylinder configuration L6; material Forged Steel; size STD; condition New; warranty 12 Months. Measured characteristics include valve train 24V. It is supplied in standard size, so no undersize bearings or additional machining are required at assembly.

OEM / Reference Numbers: OEM and cross-reference numbers covered by this listing are 11217580483.

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

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. A new component avoids the lead time and uncertainty of sourcing and reconditioning a used original part.

Installation or Fitment Notes: Prior to installation, verify the reference number, measure all journals and inspect the block and bearing bores for wear or distortion. Install with new bearings, confirm oil clearance using plastigauge, and tighten the main and rod caps to factory torque and sequence. Installation should be carried out by a qualified technician using the vehicle manufacturer's procedures and torque specifications. Record the fitted part number and mileage in the service history so future maintenance references the correct replacement.