How To Replace A Mazda Serpentine Belt

Are you a Mazda owner who needs to replace a serpentine belt? We’ll show you how to do it yourself.

A repair shop or Mazda dealer will charge you a lot of money to replace the serpentine belt. They’ll factor in:

  • Labor (which is usually about $100 per hour, and they’ll charge you for the full hour even if the job takes less than an hour)
  • A large markup on the replacement serpentine belt

How You’ll Save Money By Replacing The Belt Yourself

Belt replacement

By going the DIY route, you’ll save quite a bit of money on labor and replacement parts. You can even get an OEM replacement serpentine belt online at rock bottom prices. In fact, we’re authorized sellers of genuine OEM Mazda parts, and we offer wholesale pricing.

If you order a serpentine belt from us and take care of the job yourself, you’ll only pay the cost of the replacement part. So you’ll pay only $10-$60, depending on how much the replacement unit costs. It’s a fraction of the $100-$200 you’d pay at a shop or dealership.

Check out our inventory of genuine OEM serpentine belts at wholesale pricing!

Signs That You Need To Change Your Serpentine Belt

Serpentine belts should last about 75K miles. Your serpentine belt will go bad at some point. So you want to know the most common symptoms of a failing belt:

  • Squealing noise in the engine bay
  • Low power from the power steering system
  • Dim headlights
  • Overheating engine

If you can identify the symptoms of a bad serpentine belt, you can replace it before more issues occur. If you're not sure whether you serpentine belt has failed yet, this diagnostic guide will help you.

Replacing The Serpentine Belt In Your Mazda

Replacing the serpentine belt in most Mazdas is a pretty easy DIY job. We based this set of instructions on the following models:

  • Mazda 3
  • Mazda 5
  • Mazda 6
  • Mazda CX-7
  • Mazda Speed6

If you have another Mazda model, you might be able to apply these instructions to your car. But expect some variations.

What Tools Will You Need?

Before starting the job, you need a replacement serpentine belt and all the necessary tools on hand. Here's what you will need:

  • Socket set
  • Ratchet wrench
  • Screwdriver
  • Flashlight

The Steps To Take

So here's how you can replace a serpentine belt on your Mazda:

Removing The Old Serpentine Belt

  1. Lift your Mazda and then prop it up with jack stands.
  2. Remove the wheel on the passenger side.
  3. Slide underneath the car and then remove the seven bolts holding the splash shield in place.
  4. Find the splash guard in the fender and then remove the two 10 mm bolts holding it in place. There's also a screw. Remove that too. Take the splash guard off and then set it aside.
  5. Take a couple pictures of the belt showing how it wraps around the pulleys and tensioner(s).
  6. Using the indicators on the belt as a guide, twist the belt tensioner clockwise. Use a ratchet or wrench to get a little more leverage. Twist the tensioner far enough to allow the belt to slide off with ease.
  7. Remove the old serpentine belt.

Installing The New Serpentine Belt

Serpentine belt
  1. Inspect the tensioner for play or other issues.
    • With your finger, spin the pulley to see if it's spinning smoothly. If it feels wobbly or rough, you're going to want to replace the tensioner too.
  2. Open the hood.
  3. Find a model-specific diagram of how the serpentine belt should be routed. Follow the diagram while wrapping the serpentine belt around all the pulleys and tensioners. You may need to slide underneath the vehicle again to get the belt around some hard-to-reach parts.
  4. Release the tensioner to tighten the belt around all the pulleys.
  5. Check each pulley to make sure that the serpentine belt wraps around it the right way.
  6. Put all the splash panels back on:
    • Fender splash guard
    • Lower splash shield
  7. Reinstall the wheel and lower your car.

You're all good to go!

Please contact us if you have any questions about replacing your Mazda serpentine belt.