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2005 Mustang GT Serpentine Belt Tensioner Replacement

This guide will help you to replace a bad...

iFixit Library Ford Mustang Easy 30 - 50 minutes Guide 142256

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Guide overview

Before you begin

This guide will help you to replace a bad tensioner pulley in your 2005 Mustang GT. This may also apply to other years as well. If the tensioner is broken or just very noisy, this guide will help you correct the issue by replacing the part. Please use caution when working on any vehicle as serious injury can occur if you do not take proper precautions. Be sure the car is off and the parking brake is engaged.

Step 1

Repair step

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To open the hood, pull the hood latch located on the left side of the driver's foot well.

Step 2

Repair step

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Push a lever (located just above the horse in the grill) to the left.
Lift the hood up, pull the prop out, and insert it into the hole on the hood labeled "prop."

Step 3

Repair step

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Disconnect the battery using an 8 mm socket and 3/8 inch drive ratchet.

Step 4

Repair step

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TOOL USED ON THIS STEP 6-in-1 Screwdriver Referenced by the iFixit guide

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Loosen the band clamp on the throttle body with a flathead screwdriver.

Step 5

Repair step

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Loosen the band clamp on the air filter or airbox.

Step 6

Repair step

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Pull the intake tube back and to the left to remove it from the throttle body and airbox.
Place the intake tube out of the way

Step 7

Repair step

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Make note of the orientation that the serpentine belt runs. If the tensioner is broken, and the belt is no longer on, refer to a diagram for the vehicle. If still attached, release tension on the belt using a 1/2 inch breaker bar turned in the clockwise direction and remove it.

Step 8

Repair step

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Remove the three 10 mm bolts with your 3/8 drive and 10 mm socket.
Remove the tensioner.

Step 9

Repair step

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Install the new tensioner and torque the bolts to 20ft lbs. then using the breaker bar turn clockwise to allow the reinstallation of the belt.
Using the breaker bar, turn clockwise to allow the reinstallation of the belt.

Step 10

Repair step

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Make sure all the grooves of the pullies are seated in the belt correctly, then release the tensioner to seat the belt.