Replacing an old serpentine belt (fan belt) isn't as hard as you think. We will demonstrate the proper procedure for replacing and installing a new serpentine belt. We will also show signs of wear or failure on a serpentine belt. In addition, we will show you how to replace your tensioner and idler pulley while you replace your serpentine belt. Proper belt tension is critical for the correct operation of all your accessories, and it’s the belt’s wedging force under tension that creates friction and transfers torque from the crank to your accessories. If the tensioner isn’t supplying enough tension, or if the belt is worn down, the belt may slip and create excessive heat or belt noise.
View the full job and shop supplies here:
Supplies Needed for This Job:
1. Safety Glasses:
2. Gloves:
3. Ratchet Set:
4. Serpentine Belt:
5. Idler Pulley:
6. Tensioner:
7. Breaker Bar:
0:00 Welcome Back
0:58 Prep the Vehicle
1:06 Note the Belt Routing
1:31 Remove the Belt
1:59 Remove the Tensioner
2:10 Install the New Tensioner
2:24 Idler Pulley Info
2:49 Route the New Belt
3:49 Start Your Engine
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Transcript:
Once you’ve got your materials together, here’s what you’ll do:
Turn off your vehicle, lift the hood and let the engine cool down.
The belt will be the first thing to come off and the last thing to go back on…
So find the routing layout of your vehicle’s serpentine belt. Each model will be different.
On our Jeep, we’ve got a diagram of the belt routing here on the radiator support, but you can usually find the layout in your owner’s manual or somewhere in the engine compartment.
For an easy reference, take a picture of the diagram so you’ll have it handy.
In some cases, you may have to make a sketch of the belt routing.
Your diagram should indicate where the tensioner is located.
Use your ratchet and socket to rotate the belt tensioner to relieve tension on the belt… and slip the belt off one of the pulleys.
If you need more leverage, use a breaker bar.
If your vehicle has a manual tensioner, you’ll tighten the bolt to keep it in place once tension is relieved.
Once the belt is slipped off, you can remove your ratchet from the tensioner.
Now, remove the belt completely.
To remove the tensioner, you’ll remove the bolt or bolts securing it.
Keep those bolts in case your new tensioner doesn’t include them.
Install your new tensioner by bolting it in place… torquing the bolts to manufacturer’s specifications.
An idler pulley is typically held in place by a single bolt.
To remove one, hold the pulley steady with one hand and remove the bolt with your ratchet.
Install your new pulley and torque it to the manufacturer’s specifications.
Good belt-to-pulley contact is necessary for the belt to create the friction needed to transfer the power to the accessories.
So before installing your new belt, inspect and clean all the accessory pulleys to ensure no oil or grease is on them.
A greasy pulley will contaminate the belt as soon as you start your vehicle.
Soap and water works great for this.
Now use your diagram as a reference, and start routing your new belt from the bottom.
Get the belt looped onto all but one pulley.
You’ll need your ratchet to turn the belt tensioner enough to get the belt around the last pulley.
Once the belt is in place, check it at each pulley to make sure it’s properly seated to avoid abnormal wear.
Now you can remove your ratchet.
Start up your engine, and take a look from a safe distance to make sure the belt is staying seated the way it should be with the vehicle running.
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