2016-2019 BMW 7 Series 4.4 Crankshaft S265155601
Specifications
OEM number
S265155601
Donor year
2016
Body style
Sedan
Fuel
Gas
Engine size
4.4 L
Transmission
Auto
Drivetrain
AWD
Suspension
Air
Trim
Xdrive m package
Donor mileage
87000
Paint code
A89 Imperial Blue Brilliant Effect
About this part
Also known as
Crankshaft
Crank
Engine Crankshaft
Main Shaft
Motor Crankshaft
Bottom End Shaft
What this part does
The crankshaft is a heavily machined, precision-balanced steel component located at the bottom of the engine block. It translates the linear combustion force of the pistons and connecting rods into rotational torque that ultimately drives the transmission and wheels. The shaft rides on a thin film of pressurized oil across the main bearing journals, while the offset rod journals attach directly to the piston connecting rods. At the front of the engine, it drives the primary timing chain and accessory belts; at the rear, it provides the mounting point for the transmission flexplate or flywheel. If the component suffers from oil starvation, the bearing journals can become deeply scored or spun, leading to severe bottom-end rod knock, loss of rotational balance, and complete catastrophic engine failure.
Fits these vehicles
| Make | Model | Years | Engine |
|---|---|---|---|
| BMW | 7 Series (750i, 750i xDrive) | 2016-2019 | 4.4L V8 |
| BMW | 5 Series (M550i xDrive) | 2017-2019 | 4.4L V8 |
| BMW | X5 (xDrive50i) | 2014-2018 | 4.4L V8 |
| BMW | X6 (xDrive50i) | 2015-2019 | 4.4L V8 |
OEM and interchange numbers
S265155601
S265-155-601
S 265 155 601
Before you order
Proper installation of this crankshaft requires precise measurement of all journals using a micrometer to select the correct thickness for new main and rod bearings. Never reuse old bearings or torque-to-yield main cap bolts when rebuilding the bottom end. It is highly recommended to have the internal oil passages thoroughly flushed and the bearing surfaces professionally micro-polished by a machine shop before final assembly into the engine block.
Always verify the OEM number S265155601 against your original unit. BMW utilized several different variations of the 4.4L V8 engine (such as the N63 and N63TU updates) which feature different counterweight balancing and stroke configurations. Installing an unmatched shaft will result in severe engine vibration and rapid bearing failure.
