🔧 Pathfinder - Accessory Drive Belt Replacement (No Timing Belt)

Your Pathfinder’s 3.5L V6 uses a timing chain (internal) and does not have a timing belt to replace on a maintenance schedule. Most people asking for a “timing belt” on this engine actually mean the accessory/serpentine drive belt that runs the alternator and A/C.

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

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⚠️ Safety & Precautions

• 🛑 Work on a cool engine; keep hands clear of pulleys.
• 🧰 Support your Pathfinder with jack stands if you lift it—never rely on a jack alone.
• 🔌 No battery disconnect is required for this belt replacement, but keep the key away so nobody starts it.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Mechanic gloves
• 17mm socket
• Breaker bar (1/2")
• Torque wrench (20–200 ft-lbs range)
• 10mm socket
• Ratchet (3/8")
• Trim clip removal tool
• 14mm socket
• Long-handled ratchet (3/8")
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Accessory drive belt (serpentine belt) - Qty: 1
• Plastic underbody clips - Qty: 2–6

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📋 Before You Begin

• 🅿️ Park on level ground, shift to Park, and set the parking brake.
• 🧱 Place wheel chocks behind the rear tires.
• 📸 Take a photo of the belt routing if you can see it, or look for the belt-routing sticker under the hood.
• “Tensioner” = spring-loaded arm that tightens the belt.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Lift the right-front corner (if needed for access)

• Use 17mm socket and breaker bar to slightly loosen the right-front wheel lug nuts.
• Use floor jack (rated 3-ton minimum) to lift at the front right jack point.
• Set the vehicle onto jack stands (rated 3-ton minimum).
• Remove the wheel with the 17mm socket.

Step 2: Remove the lower splash shield / access panel

• Use a trim clip removal tool to pop out plastic clips.
• Use a 10mm socket and ratchet (3/8") to remove any small bolts.
• Set the panel and hardware aside in order.

Step 3: Locate the belt tensioner

• Use a flashlight to find the belt and the spring-loaded tensioner arm.
• Confirm the belt path around the pulleys before removing anything.

Step 4: Release belt tension

• Place a 14mm socket on the tensioner’s hex boss/bolt head.
• Use a long-handled ratchet (3/8") to rotate the tensioner and relieve tension (it will feel springy).
• While holding the tensioner rotated, slip the belt off the easiest-to-reach top pulley.
• Slowly let the tensioner return to rest. Don’t let it snap back.

Step 5: Remove the old belt and compare

• Pull the belt out from all pulleys by hand.
• Compare the old and new belt length/rib count before installing.

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

• Route the new belt around all pulleys except one easy pulley (leave that one for last).
• Make sure every rib sits fully in each pulley groove (no ribs hanging off an edge).
• Use the 14mm socket and long-handled ratchet (3/8") to rotate the tensioner again.
• Slip the belt onto the final pulley, then slowly release the tensioner.

Step 7: Reinstall the splash shield and wheel

• Reinstall the splash shield using the 10mm socket, ratchet (3/8"), and the plastic clips (press clips in by hand).
• Reinstall the wheel and hand-thread lug nuts.
• Lower your Pathfinder off the stands using the floor jack (rated 3-ton minimum).
• Tighten lug nuts in a star pattern with a torque wrench (20–200 ft-lbs range): Torque to 133 Nm (98 ft-lbs).

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✅ After Repair

• 🔍 Before starting, re-check the belt is seated on every pulley groove.
• 🚗 Start the engine and watch the belt for 20–30 seconds—no wobble, squeal, or walking off a pulley.
• 🛑 If you hear squealing, shut it off and re-check routing and rib alignment.

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💰 DIY vs Shop Cost

Shop Cost: $150-$300 (parts + labor)

DIY Cost: $30-$70 (parts only)

You Save: $120-$230 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.

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Quick question (so I guide you correctly): Did you mean the accessory/serpentine belt (external belt), or are you trying to address a timing chain issue (rattle on cold start, P0011/P0014-type codes, etc.)?