🔧 Outback - Serpentine Belt Replacement

The serpentine belt (the single belt that drives the alternator and A/C) can wear, crack, or start squealing. On your Outback, replacement is usually straightforward because the belt is held tight by an automatic belt tensioner (a spring-loaded pulley that keeps the belt tight).

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

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⚠️ Safety & Precautions

• 🧯 Work on a cool engine; hot pulleys can burn you.
• 🧤 Keep fingers/tools clear of pulleys; the tensioner can snap back.
• 🧱 If you raise the front, support with jack stands; never rely on a jack.
• 🔋 Battery disconnect is not required, but keep the key far away and do not start the engine during the job.

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🔧 Required Tools

You'll need the following tools for this repair:

• 14mm socket
• 17mm socket
• 3/8" ratchet
• 3/8" breaker bar (18"-24")
• 10mm socket
• Trim clip removal tool
• Flashlight
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Mechanic gloves
• Safety glasses

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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, shift to Park, and set the parking brake.
• Chock a rear wheel using wheel chocks.
• Open the hood and locate the belt routing diagram (usually on a sticker under the hood). If it’s missing, take a clear photo of the current belt routing before removing it.
• If access is tight from above, raise the front slightly with a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm belt routing and inspect pulleys

• Use a flashlight to find the belt routing diagram and compare it to what you see.
• Check the belt for cracks, missing ribs, or glazing (shiny, hardened rubber).

Step 2: Remove any covers that block access (if equipped)

• If your Outback has a plastic engine cover, remove it by pulling up firmly by hand (it’s held by rubber grommets).
• If you’re working from underneath and there’s a lower splash shield in the way, remove fasteners with a 10mm socket and a trim clip removal tool.

Step 3: Locate the automatic belt tensioner

• Use a flashlight to locate the tensioner pulley (the pulley on a spring-loaded arm).
• Find the bolt head on the tensioner pulley/arm that your tool will turn.

Step 4: Relieve belt tension

• Install a 14mm socket on a 3/8" breaker bar (18"-24") and test-fit it on the tensioner’s bolt head.
• If 14mm does not fit snugly, switch to a 17mm socket on the same breaker bar.
• Rotate the tensioner smoothly to relieve tension. Hold steady; don’t let it snap back.

Step 5: Remove the old belt

• While holding the tensioner rotated with the breaker bar, slip the belt off the easiest-to-reach pulley (often the top pulley).
• Slowly release the tensioner back to its resting position.
• Remove the belt from the remaining pulleys and pull it out.

Step 6: Install the new belt (start routing first, tension last)

• Route the new belt around the pulleys following the under-hood belt routing diagram.
• Make sure the belt ribs sit fully in the grooved pulleys (no ribs hanging off).
• Leave the easiest pulley for last so you can slip the belt on while the tensioner is rotated.

Step 7: Apply tension and seat the belt

• Rotate the tensioner again using the breaker bar and the correct socket.
• Slip the belt onto the last pulley, then slowly release the tensioner.
• Use the flashlight to re-check every pulley: the belt must be centered and fully seated.

Step 8: Reinstall covers/shields

• Reinstall any splash shield fasteners using the 10mm socket and trim clip removal tool.
• Reinstall the engine cover by aligning grommets and pressing down by hand.

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✅ After Repair

• Start the engine and watch the belt for 15–30 seconds. It should run straight with no wobble.
• Listen for squeal or chirping. If you hear noise, shut it off and re-check belt seating on every pulley.
• After a short 5–10 minute drive, re-check belt alignment again with a flashlight.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $25-$70 (parts only)

You Save: $110-$325 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?

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