Loading...

Bmw 740E Xdrive Serpentine Belts

Bmw 740E Xdrive Serpentine belts

Starting at $30.95, AutoBuffy stocks 1 serpentine belts for the Bmw 740E Xdrive from brands including Gates. The serpentine belt is a single continuous loop that drives the alternator, power steering pump, air conditioning compressor, and water pump. When it fails, those systems stop working simultaneously — leaving you stranded with a dead battery, no steering assist, and an overheating engine.

Signs your Bmw 740E Xdrive needs a new serpentine belt

  • High-pitched squealing or chirping noise from the front of the engine, especially on cold starts or when turning the wheel sharply
  • Visible cracks, fraying, glazing, or missing chunks on the belt's ribbed surface
  • Battery warning light illuminates because the alternator is no longer charging properly
  • Power steering feels heavy or unresponsive, requiring noticeably more effort to turn
  • Air conditioning stops blowing cold air while the engine is running
  • Engine temperature rises unexpectedly because the water pump is belt-driven and losing speed

Which serpentine belt should you buy for your Bmw 740E Xdrive?

The most important buying decision is matching the exact belt length, width, and rib count to your Bmw 740E Xdrive's engine configuration — an off-by-one-rib belt will slip or not seat correctly. Beyond fit, the main tradeoff is between OE-equivalent EPDM rubber belts and longer-life high-mileage or stretch-fit designs.

OE-Equivalent EPDM Belt
Best for
Standard replacement on a well-maintained engine
What you get
Factory-matched length, rib count, and flex profile; resists heat and cracking; direct swap with no routing changes
High-Mileage / Extended-Life Belt
Best for
Vehicles with higher odometer readings or those in extreme climates
What you get
Reinforced EPDM compound rated for longer service life; better resistance to heat cycling and accessory load fluctuation
Stretch-Fit Belt (no tensioner needed)
Best for
Engines where the automatic tensioner is worn or hard to access
What you get
Elastic construction installs without a tensioner tool; maintains consistent tension but requires exact sizing — not interchangeable with standard belts
OEM-Brand / Dealer-Sourced Belt
Best for
Owners who want the exact part the factory installed
What you get
Manufactured to original spec, often by the same supplier; higher upfront cost but eliminates any fitment guesswork

Serpentine belts brands we stock for your Bmw 740E Xdrive

Gates
1 option · from $30.95

Replacing the serpentine belt on a Bmw 740E Xdrive

Easy⏱ 30–60 minutesSerpentine belt tensioner tool or breaker barSocket and ratchet setFlashlight or work lightPermanent marker or phone camera (to record belt routing before removal)

Before removing the old belt, photograph or sketch the exact routing path around every pulley — most engine bays also have a routing diagram printed on a sticker near the radiator support. Use the tensioner tool to rotate the tensioner arm and release belt tension, slide the old belt off, then thread the new belt following the same routing and release the tensioner onto it. Run the engine briefly and visually confirm the belt is seated squarely in every pulley groove before closing the hood.

Frequently asked questions

How much does it cost to replace serpentine belts on a Bmw 740E Xdrive?
The belt itself starts at $30.95 for the Bmw 740E Xdrive. DIY total cost is typically just the belt plus any tensioner or idler pulley you choose to replace at the same time. Shop labor adds roughly one to two hours of labor time on top of parts, making DIY replacement one of the better cost-saving opportunities in routine maintenance.
How long does a serpentine belt last on a Bmw 740E Xdrive?
On most modern vehicles the serpentine belt is rated for a wide service interval, commonly somewhere in the range of 60,000 to 100,000 miles, though heat, oil contamination, and accessory load can shorten that significantly. Inspect the belt visually every time you change your oil and replace it at the first sign of cracking or glazing regardless of mileage.
Can I drive my Bmw 740E Xdrive with a worn or slipping serpentine belt?
No — driving on a worn serpentine belt is a short-term risk with serious consequences. A slipping belt reduces alternator output and can drain your battery within miles. If the belt drives your water pump, the engine can overheat quickly. If it breaks while driving, you lose power steering instantly. Replace it before driving further.
Should I replace the tensioner and idler pulleys when replacing the serpentine belt on my Bmw 740E Xdrive?
Yes, it is strongly recommended. The tensioner and idler pulleys wear at a similar rate as the belt, and bearing failure in either one is a leading cause of belt squeal and premature belt wear. Replacing them together as a kit costs more upfront but avoids a repeat job shortly after and ensures consistent belt tension from day one.
How do I know if the serpentine belt or a pulley is causing the squealing noise on my Bmw 740E Xdrive?
Spray a small amount of water on the ribbed side of the belt while the engine is running. If the squeal briefly stops or changes pitch, the belt itself is glazed or slipping and needs replacement. If the noise persists unchanged, the source is likely a seized or misaligned idler pulley, tensioner bearing, or a seized accessory such as the alternator or A/C compressor.
Do I need a special tool to replace the serpentine belt on my Bmw 740E Xdrive?
Most serpentine belt replacements require a breaker bar or a dedicated belt tensioner tool to rotate the spring-loaded tensioner arm and release belt tension. The tensioner tool fits the square drive hole or specific hex fitting on the tensioner pulley bracket. Without it, releasing tension is awkward and risks injury. Many auto parts stores loan the tool for free.

Shop serpentine belts by year for the Bmw 740E Xdrive

201920182017

More parts for your Bmw 740E Xdrive

Brake Pedal Travel SensorFuel Feed LineHVAC Blower Motor ResistorHVAC Blower Motor Resistor ConnectorTire Pressure Monitoring System (TPMS) Programmable Sensor Valve KitRack & Pinion Bellows KitPower Brake Booster Vacuum SensorTie Rod End

Serpentine belts for other Bmw models

Bmw 435i xDrive Gran CoupeBmw Alpina B7 xDriveBmw 328i GT xDriveBmw 645CiBmw M340i xDriveBmw 550i