BMW N63B44/S63 Crankshaft – OE 11217620981

Overview

Replacement N63B44/S63 crankshaft for BMW applications, referenced against OE 11217620981, 11217616597, 11212212307. Built as a service part for engine overhaul, it replaces a worn or damaged original crankshaft rather than modifying the existing one.

Engine application

• Engine code: N63B44/S63
• Listed for: BMW
• OE references: 11217620981, 11217616597, 11212212307, 11212212319

How this part fails

A crankshaft carries the connecting rods and converts their motion into rotation, so it runs on precision-ground journals inside replaceable bearing shells. It fails when oil pressure drops, clearances go out of spec or debris passes through the bearings. Typical symptoms are a deep knock under load, low oil pressure at idle, metallic debris in the oil and visibly scored or blued journals once the sump is off.

Specifications

Fitment checks before ordering

Verify fitment by engine code and OE number, not by model year or capacity. If your engine is a N63B44/S63 variant but your OE number is absent from this list, treat the part as unconfirmed and ask before ordering.

Rebuild notes

A replacement crank should be checked against the block before assembly: main and big-end journal diameters, taper and ovality, thrust clearance and runout. New bearing shells matched to the measured journal size are required, and the oil ways should be cleaned and the rear seal replaced while access is open. Assembly lubricant, correct bolt torque and a plastigauge check on each journal are standard practice.

What is included

Supplied as one crankshaft. Bearings, seals, bolts and gaskets are not included unless stated, and a rebuild normally requires new main and big-end bearings matched to the journal size.

Availability and warranty

The listing does not publish a stock quantity, so availability is confirmed by the supplier at order rather than shown here. The manufacturer states a 1 year or 10,000 KM, whichever comes first warranty on this listing.