BMW 840i xDrive Gran Coupe Serpentine/Drive Belt Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(248)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(248)

Serpentine/Drive Belt Replacement Service

How much does a Serpentine/Drive Belt Replacement cost?

On average, the cost for a BMW 840i xDrive Gran Coupe Serpentine/Drive Belt Replacement is $290 with $38 for parts and $252 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2020 BMW 840i xDrive Gran CoupeL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$354.72Shop/Dealer Price$380.13 - $441.78
2021 BMW 840i xDrive Gran CoupeL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$338.50Shop/Dealer Price$360.73 - $420.00
2022 BMW 840i xDrive Gran CoupeL6-3.0L TurboService typeSerpentine/Drive Belt ReplacementEstimate$338.50Shop/Dealer Price$360.78 - $420.08
Show example BMW 840i xDrive Gran Coupe Serpentine/Drive Belt Replacement prices

What is a serpentine belt and how does it work?

A serpentine belt is a relatively long, flat, multi-ribbed belt that is driven by the engine’s crankshaft pulley. The belt drives many, and often all, of the engine accessories such as the alternator, air conditioning compressor, power steering pump, water pump, and air pump. The serpentine belt is tensioned by a hydraulic or spring-loaded automatic tensioner. Some older cars use a serpentine belt to drive most accessories but will also have a shorter v-style belt to drive, for example, the power steering pump.

Belts

When to consider replacing the serpentine belt:

  • Regularly scheduled maintenance. Typically, belt manufacturers recommend belt replacement at 90,000 miles. However, the belt must be inspected for wear or damage at regular intervals prior to this high mileage.
  • Squealing noise, belt slippage, visible belt damage. Should the belt fail or wear out prematurely, you may hear noise or you may see visible signs of deterioration such as missing chunks of rubber, excessive cracking, or a shredded appearance on the edge of the belt.
  • Battery Light. A loose belt, perhaps caused by a defective tensioner, may not drive the alternator at adequate speed and thus the battery may discharge, causing the warning light to illuminate.
  • Engine overheating. Often, the serpentine belt drives the water pump. In those applications, if the belt breaks the engine will overheat in seconds to minutes. If the belt is inadequately tensioned, you may notice higher-than-normal engine operating temperature.

How do mechanics replace the serpentine belt?

  • Prior to removing the belt, the mechanic must run the engine to determine if the idler pulley and the belt tensioner are noise-free. Those rotating components have grease filled bearings and are subject to wear. In addition, the mechanic will ensure that all pulleys and accessories are turning in the same plane. These steps help make sure your new belt will operate trouble-free for its full-service life.
  • The belt’s routing path through the various components is noted. The belt tensioner is released, usually with a wrench or lever, to release the tension from the belt. With the tension off, the belt slides off the pulleys.
  • All rotating components — that is the alternator, air conditioner compressor, etc. — are checked for smooth operation and no noise.
  • If everything checks out, the new belt is slipped over all of the pulleys while holding the tensioner away from the belt. Once the belt is centered on all pulleys, the tensioner is released and the installation is complete. The engine is run to ensure normal operation.

Is it safe to drive with a serpentine belt problem?

No. Should the belt have visible damage, you risk unexpected and sudden breakage that could potentially leave you stranded. Serpentine belt problems that result in the alternator not charging may cause the battery to discharge, which will result in loss of electrical power to the vehicle. Additionally, if a deteriorated belt breaks and that belt drives the water pump, the engine will overheat in a matter of seconds.

When replacing the serpentine belt keep in mind:

  • On many cars, the expected service life of a serpentine belt is around 90,000 miles. Should the belt fail well prior to that, a very careful inspection should be performed to check for out-of-alignment pulleys, a possibly out-of-position crankshaft harmonic balancer on which the drive pulley is mounted, binding pulleys, or a defective belt tensioner.
  • Attention should always be given to serpentine belt routing, since proper routing is critical to proper belt tension, and function of the driven components.
  • Sometimes it is difficult to distinguish serpentine belt related noise from other engine noises. In these cases, a mechanic will determine the origin of the noise by momentarily running the engine without the serpentine belt attached.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(248)

Rating Summary
237
2
4
1
4
237
2
4
1
4

Ben

30 years of experience
59 reviews
Ben
30 years of experience
BMW 335is L6-3.0L Turbo - Serpentine/Drive Belt - Acworth, Georgia
Ben did a great job!! I would use him again.

Patrick

12 years of experience
159 reviews
Patrick
12 years of experience
BMW 328xi L6-3.0L - Serpentine/Drive Belt - Scottsdale, Arizona
Good communication, told me what problems I wa shaving and took care of the job

AL

13 years of experience
245 reviews
AL
13 years of experience
BMW 335i L6-3.0L Turbo - Serpentine/Drive Belt - Melbourne, Florida
Awsome work, Al arrived sharp on time. Worked non stop to get it done. This is the best garage service we found for our BMW.

Nazareth

28 years of experience
345 reviews
Nazareth
28 years of experience
BMW 328i L6-3.0L - Serpentine/Drive Belt Replacement - Altadena, California
Nazareth was friendly, professional and punctual. Would use him again and recommend to others.

Excellent Rating

(248)

Rating Summary
237
2
4
1
4
237
2
4
1
4
Number of BMW Serpentine/Drive Belt Replacement services completed
2728+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1200+
experts on our platform

Recent articles & questions

P0366 OBD-II Trouble Code: Camshaft Position Sensor "B" Circuit Range/Performance (Bank 1)
P0366 P0366 code definition The P0366 code is defined as an incorrect voltage reading from the camshaft position sensor circuit, specifically for the engine bank 1 camshaft sensor B. What the P0366 code means In order to control fuel injection...
How to Install a Capacitor
It It can be upsetting to know you just put a bunch of your hard-earned money into a new car stereo (https://www.yourmechanic.com/article/4-essential-things-to-know-about-your-car-s-stereo-and-speakers), only to realize it sounds terrible. You changed the head unit, added more speakers (https://www.yourmechanic.com/article/how-to-replace-your-car-speakers), and better yet,...
Can Dirt and Mud Ruin Windshield Wiper Blades?
Your Your wiper blades are responsible for clearing a viewable path on your windshield so you can see where you’re going. They wipe away rain, snow, ice, dust, dirt, bird droppings, and any other debris that ends up on the...

How do I adjust the brightness of the dash lights?

Adjusting the brightness of your dash helps you preserve your night vision and drive more comfortably. It’s also easy to do on the Civic. Here’s how: Locate the brightness control knob on the dash of your car Turn it to...

Exhaust gases in coolant

When I turn on the ac its puts the vehicle in limp mode. All the fuses are good. With a multimeter I had someone hit the ac button and the battery reading was around 14.7 it should have gone down not up? 2005 Chevy Tahoe 4.8 V8

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com