Mazda Serpentine Drive Belt Replacement
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Learn to change the serpentine (engine drive belt) on a Mazda four-cylinder engine. The 2.5L is one of Mazda’s most popular engines, and it is found in several models, including the Mazda 3, 5, 6, and even Tribute.
At a Glance
- Fits: Mazda 2.5L four cylinder in the Mazda3, Mazda5, Mazda6 and Tribute.
- Access is from the passenger side wheel well; support the car on a jack stand.
- Tools: 10 mm for the access panel, 14 mm and a long bar for the tensioner.
- Photograph the belt routing before removing the old belt.
- Replace the belt when it is cracked, glazed, frayed or noisy.
What you will need
- Mazda Serpentine Belt
- Metric Tools set
- 10mm socket to remove the access panel
- 14mm socket to loosen the tensioner
- Ratchet
- Screwdriver
Procedure
To remove the serpentine belt on a Mazda, you must remove the passenger-side wheel. In the front passenger wheel well, you will see an access panel held in place that needs to be removed.
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- Park your Mazda on level ground. Engage the parking brake.
- Allow your engine to cool down for at least twenty minutes.
- Open the hood of your Mazda.
- Locate the serpentine belt tensioner on your Mazda engine. Move the tensioner away to release pressure from the belt.
- Next, jack up your Mazda front tire on the passenger side. Support the car on a jack stand, then remove the front passenger wheel. Remove the access panel held in place with three 10 mm bolts.
- Use a 14mm socket to push the tensioner away from the belt by turning it clockwise. You will need to use a cheater bar to move the tensioner back.
- Remove the belt from the accessory pulleys by hand. The belt must come off several pulleys, including the A/C and alternator pulleys and, on models with a belt driven power steering pump, that pulley too. Photograph the routing before you remove the old belt.
- Install the new belt on your Mazda by ensuring it is routed according to the belt routing diagram or by referencing your pictures. The last step is to slide the belt under the tensioner. Before you do that, check that the belt is seated correctly on all the pulleys, or you will have difficulty installing it.
- Reinstall the access panel cover.
- Reinstall the wheel and lower the vehicle.
Recommended Interval
Mazda’s maintenance schedule calls for inspecting the drive belt at set intervals rather than replacing it at a fixed mileage; check the schedule for your model. Replace it when it is cracked, glazed, frayed, or squeals. The serpentine belt may also be called the drive, accessory, or alternator/air conditioner belt.
Symptoms
As the Mazda drive belt wears, you may notice symptoms such as:
- Cracks on the belt
- Squealing noise at startup
- Noise when turning the steering wheel
- Power steering is getting hard at times.
- Glazed belt
Spraying the Belt Conditioner is one way to verify that the serpentine belt needs replacement. The belt is bad if the squeaky noise goes away when spraying the conditioner.
What happens if your Mazda serpentine belt breaks?
If the serpentine belt comes off or breaks while driving, you will lose power steering, accessories, and the alternator. The steering wheel will alsobe tough to turn.
Your Mazda engine will shut off within a few minutesas it runs out of battery. Don’t ignore replacing the serpentine belt; it only costs less than $30. Do not drive a Mazda with a broken serpentine belt.
Frequently Asked Questions
How do I get to the serpentine belt on a Mazda 2.5L?
Access is through the passenger side wheel well. Raise the car, support it on a jack stand, and remove the access panel with a 10mm socket.
What tools do I need to replace a Mazda serpentine belt?
A 10mm socket for the access panel, a 14mm socket and a long bar to release the tensioner, plus a jack and jack stand.
How often should I replace the serpentine belt on a Mazda?
Mazda calls for inspecting the belt at set intervals. Replace it when it is cracked, glazed, frayed or noisy.
What happens if the serpentine belt breaks?
You lose the accessories it drives, such as the alternator and power steering, and on engines where it drives the water pump the engine can overheat. Stop driving and replace it.
Check these troubleshooting and repair guides for more help on your Mazda.
I cannot find a Mazda recommendation anywhere that a 2014 Mazda 3 serpentine belt should be replaced every 35K. I have seen folks state they proactively change the belt anywhere from 60K to 100K. I have only heard of one instance where a Mazda 3 serpentine belt failed and that was on a Mazda 3 with over 120K on it.
Given these facts it seems that replacing the belt every 35K is both a waste of money and materials.
nicely illustrated with pictures.
Ok. So I have a 2012 Mazda Mazda5. Bought it some 5 years ago because I needed a third row for the car seat of my kids. I usually get my belts at Rockauto.com or amazon. I always try to buy decent belts, the ones I use are Gates and they’ve worked fine for me. After 30k miles I took my car to my a local mechanic I’ve dealt with for a long time. I’m told by his son that the man passed away.
My mechanics son was not able to do it that day and I decided to try it myself. The job was not easy, mainly because I had never change the belt to this car before. Mike, mentioned that he used a “C” clamp to keep the tensioner openned. He’s absolutely right the tensioner must be fully open to put the belt on.
Even with the tensioner fully openned I had trouble slipping the belt into all pulleys. So… I decided to remove the Idler pulley, slip on the belt and tightened it back. Voila!!!! It worked like a charm. Had I known that this would have been this easy, I would have done this myself all along.
If your going to attempt this on your own I suggest you have a nice long 14mm wrench. If you don’t you will have a hard time. Good luck. Hope this helps.
The article was very helpful. I used a 14 MM wrench with a
much larger wrench on the other end for torque and then I pushed the
tension-er and used a C clamp to hold the wrench to keep tension on the
tension-er so I could go to the top of the engine compartment and slip the
belt over the idler pulley. Then I took the C clamp off and released the
tension.