How To Replace A Mazda Belt Tensioner

Do you have a bad belt tensioner in your Mazda engine? If so, you want to replace it as soon as possible. Neglecting to replace it will cause or prolong a bunch of problems, such as:

  • Low battery power from a weak alternator
  • Difficulty steering the vehicle from a weak power steering system
  • Dim headlights from a weak electrical system
  • Overheated engine from a weak water pump
  • Serpentine belt damage from not being tight enough

If you’re worried about paying a shop an arm and a leg to replace the belt tensioner in your Mazda engine, don’t be. You don’t even need to bring your car to a shop to get the job done. Replacing the belt tensioner is much easier than it sounds. It’s also much cheaper to DIY. Instead of paying hundreds of dollars for labor, you’ll only need to pay for a replacement belt tensioner.

Find A Replacement Genuine OEM Belt Tensioner For Your Mazda

Mazda tensioners

The first thing you need to do is to find a replacement belt tensioner. You’ll save quite a bit of money by shopping with us. is an authorized seller of genuine OEM Mazda parts. Since our overhead costs are so low, we’re able to offer wholesale pricing. Check out our catalog of genuine OEM Mazda belt tensioners to see how much money you can save on a replacement unit.

Once you have your replacement belt tensioner, roll up your sleeves and replace your tensioner with this tutorial!

How To Replace A Mazda Belt Tensioner

Belt tensioner

Image Credit: Five Foot

The steps for replacing the belt tensioner are similar to the steps for replacing the serpentine belt. Of course, you would be replacing the tensioner instead of the belt. To replace the belt tensioner in your Mazda engine, take the following steps:

  1. Make sure the engine is cool.
  2. Find the serpentine belt on your engine. On some Mazda models, you can access the serpentine belt from underneath the car. On other models, it's accessible from the top, when you have the hood open. If the belt is accessible from underneath, take the following steps:
    1. Lift the front end of your Mazda and then prop it up.
    2. Remove the front right tire, the lower splash shield, and the fender splash guard.
    3. Open the hood and then prop it open to provide more lighting.
  3. If you are replacing the belt at the same time, photograph the belt's path. This may help you when you put the serpentine belt back on.
  4. Loosen the belt tensioner to relieve tension, and slide the belt off of the tensioner. On some engines, you may be able to leave the belt mostly in place. On others, you may have to remove it to get it out of the way.
  5. With a 12 mm wrench, remove the upper and lower mounting bolts on the belt tensioner. It's going to be a tight fit, so gloves may come in handy.
  6. Remove the belt tensioner.
  7. Bolt the new belt tensioner in place.
  8. Put the serpentine belt back on, and then tighten it.
    1. If you have trouble routing the serpentine belt, find a model-specific diagram of the path.
  9. Push on the serpentine belt in the middle between two pulleys. It should deflect about 1/2". Anything more or less means the belt is too loose or too tight, respectively.
  10. Put everything else back together in the reverse order of removal.

Got any questions about finding the right belt tensioner for your Mazda model? We'll be happy to help! Just contact us here.