🔧 Outback - Serpentine Belt Replacement

The serpentine belt drives accessories like the alternator and A/C. On your Outback, you relieve the automatic belt tensioner, slip the old belt off, then route and install the new belt the same way.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a cold engine—hot pulleys and radiator fans can hurt you.
• ⚠️ Keep fingers and clothing away from pulleys; never run the engine with hands near the belt.
• ⚠️ If you raise the vehicle for access, support it with jack stands on solid ground.
• ⚠️ Battery disconnect is not required, but you can disconnect the negative terminal if you want extra safety.

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🔧 Required Tools

You'll need the following tools for this repair:

• 14mm socket
• 3/8" drive ratchet
• 3/8" drive breaker bar
• Serpentine belt tool (specialty)
• Flat-blade screwdriver
• Pliers
• Flashlight
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Open the hood and let the engine cool fully.
• Look for the belt routing diagram in the engine bay. If you don’t see one, take a clear photo of the current routing with your phone.
• If you need more room, you can remove the front plastic air snorkel/duct clips with flat-blade screwdriver and pliers (gentle—plastic gets brittle).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm belt routing

• Use a flashlight to trace the belt around each pulley.
• Take a photo so you can copy it exactly later. Photos prevent routing mistakes.

Step 2: Locate the automatic belt tensioner

• Use a flashlight to find the spring-loaded tensioner pulley (it’s the pulley that “moves” when you apply force).
• The tensioner is what keeps the belt tight automatically (no manual adjustment).

Step 3: Relieve belt tension

• Install a 14mm socket on a 3/8" drive breaker bar (or use a serpentine belt tool (specialty) if space is tight).
• Place the socket onto the tensioner’s hex boss/bolt head and rotate the tensioner to relieve tension.
• Hold the tensioner in the released position while you slide the belt off one easy-to-reach pulley.
• Move slowly—spring tension is strong.

Step 4: Remove the old belt

• With the tension released, use your hands (and a flashlight) to walk the belt off the remaining pulleys.
• Inspect the old belt for cracks, missing ribs, or glazing (shiny spots). This confirms it was due for replacement.

Step 5: Inspect pulleys before installing the new belt

• Spin each pulley by hand (engine OFF) and feel for roughness or wobble.
• If any pulley feels gritty, wobbly, or noisy, stop—there may be a bad idler/tensioner/alternator pulley that will destroy the new belt.

Step 6: Route the new belt

• Route the new belt around the pulleys following your photo/diagram, leaving the easiest pulley for last.
• Make sure the belt ribs sit perfectly in the grooved pulleys. Use a flashlight and look from the side.
• One rib off will shred the belt.

Step 7: Apply tension and seat the belt

• Use the 14mm socket with the breaker bar (or serpentine belt tool (specialty)) to rotate the tensioner again.
• Slip the belt onto the last pulley, then slowly release the tensioner so it tightens the belt.
• Re-check every pulley to confirm the belt is fully seated and straight.

Step 8: Reinstall any removed intake ducting (if removed)

• Reinstall clips/fasteners using pliers and a flat-blade screwdriver.
• Make sure nothing is left loose near the belt path.

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✅ After Repair

• Start the engine and watch the belt for 15–30 seconds (hands clear). It should run smooth with no wandering.
• Listen for chirping/squealing. If you hear noise, shut it off and re-check belt seating on every pulley.
• Take a short test drive, then re-check belt alignment once more with a flashlight.

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💰 DIY vs Shop Cost

Shop Cost: $140-$260 (parts + labor)

DIY Cost: $25-$60 (parts only)

You Save: $115-$200 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.