Video tutorial on how to replace the serpentine belt on a Ford Ranger equipped with a 2.5L 4 cylinder engine, this is a 1998 model. The same procedure can also be used on the same generation Mazda B series truck. Worn or older serpentine belts can be cracked or checked due to age, even leaking to a break. Or stretch typically causing a squeaking or squealing sound, especially in damp weather, this can cause certain components to slip such as an alternator or power steering pump and you’ll notice a shinny finish on the belt’s surface, this is called glazing. #ford #fordranger #mazdabseries

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Tools/Supplies Needed:
-new serpentine belt
-3/8″ drive ratchet

Procedure:
It’s best to do the replacement when the engine is cold as you will be working around warmer or hot components.

Usually, it’s best to either draw a diagram or source one out on the vehicle. As you can see there is a sticker still on the radiator support showing the route of the belt.

Using only a 3/8” drive, there will be a square hole where the ratchet can clip into on the tension. One belt drives all the accessories.

Rotate the tension counterclockwise to relieve the tension on the belt. There should also be an arrow on the tensioner, showing which way the tension is removed on the belt.

The easiest way to remove the belt is by removing it off the smooth idler pulley. If you are removing the belt off of a grooved pulley first, you’ll need to pull back the tensioner further which can sometimes be a bit harder. Once that belt is off the one pulley, allow the tensioner to retract, then remove the belt off the rest of the pulleys.

Pull the belt up and then feed it around the mechanical fan, you can use the assistance of the blades while rotating the fan by hand.

Once that belt has been removed, it will be stretched, however, you should size it up with the new replacement to ensure it’s the same size. Stick the belts between your thumbs and stretch them out.

To insert the new belt, first, it must be routed around the mechanical fan. Push it past some of the blades, then rotate the mechanical fan by hand to feed it around.

Before putting that belt in place, it’s important to check the idler pulley, tensioner pulley, and water pump for any play, noise, or movement issues in the bearings. Being that a new belt will be installed, there will be more tension due to less stretch and this can cause an already worn bearing to fail much quicker. When a pulley fails, there is a risk of causing more damage so a worn bearing in a pulley or water pump should be addressed immediately.

Install the belt onto the pulleys, first started with the ridged pulleys. Leaving the smooth pulley for the end requires less movement when pulling back the tensioner.

Once it’s somewhat in place, pull the tensioner back with the ratchet and then slide it over the idler pulley.

When it’s finally in place, take a close inspection to ensure the belt is in place and fully seated on the pulleys. If it’s not fully seated on the pulley, don’t start the engine. Pull the tension back and reposition the belt as needed.

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