🔧 Supra - Serpentine Belt Replacement

The serpentine belt drives accessories like the alternator and A/C. On your Supra, belt access is tight, so the job is mostly about safely lifting the front, removing the underbody paneling, and unloading the spring tensioner to swap the belt.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours

---

⚠️ Safety & Precautions

• ⚠️ Let the engine cool completely; hot coolant/oil components can burn you.
• ⚠️ Support the car with jack stands; never rely on a floor jack alone.
• ⚠️ Keep fingers/tools clear of the tensioner and pulleys; the tensioner snaps back hard.
• ⚠️ Do not start the engine with any underbody panel loose.
• ⚠️ Battery disconnect is not usually required, but keep the key/fob away so the engine can’t be started accidentally.

---

🔧 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
• 1/2" drive breaker bar
• Serpentine belt tool (specialty)
• Torx bit socket set
• E-Torx socket set
• 8mm socket
• 10mm socket
• 13mm socket
• Trim clip removal tool
• Torque wrench (10–100 Nm range)
• Flashlight
• Paint marker

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Serpentine belt - Qty: 1
• Underbody panel fastener clips - Qty: 1 set

---

📋 Before You Begin

• Park on a level surface, shift to Park, and set the parking brake.
• Place wheel chocks behind the rear tires.
• Open the hood and use a flashlight to locate the belt routing diagram (or take a clear photo of the current belt path).
• Have your new belt ready and compare its length/rib count to the old one before removal.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and support the front

• Use a floor jack (rated 3-ton minimum) to lift the front of the car at the approved front center jack point.
• Place jack stands (rated 3-ton minimum) at the left and right front support points and lower the car onto them.
• Confirm stability by gently rocking the car before going underneath.

Step 2: Remove the front underbody paneling

• Use a trim clip removal tool to pop plastic clips without breaking them.
• Remove fasteners with an 8mm socket, 10mm socket, and Torx bit socket set as equipped.
• Keep fasteners grouped by location so reassembly is easy. Lay them on a towel in rows.

Step 3: Locate the belt and tensioner

• Use a flashlight to identify the serpentine belt path across the pulleys.
• Find the spring-loaded belt tensioner (the pulley mounted on a moving arm).
• A tensioner is a spring arm that keeps belt tight automatically.

Step 4: Mark belt routing and confirm pulley grooves

• Use a paint marker to mark the belt direction and one pulley location, or take a clear photo.
• Note which pulleys are ribbed (belt ribs sit in grooves) and which are smooth (belt back rides on it).

Step 5: Relieve belt tension

• Install a serpentine belt tool (specialty) or 1/2" drive breaker bar onto the tensioner’s drive point (varies by tensioner style).
• Rotate the tensioner smoothly to unload the belt, then slide the belt off the easiest-to-reach smooth pulley.
• Slowly let the tensioner return to rest—do not let it snap back.

Step 6: Remove the old belt

• Pull the belt out from around the remaining pulleys by hand.
• Inspect the old belt for cracks, glazing (shiny ribs), or missing ribs—this confirms replacement was needed.

Step 7: Inspect pulleys and tensioner movement

• Spin each pulley by hand and feel for roughness or wobble.
• Move the tensioner with the serpentine belt tool (specialty) / 1/2" drive breaker bar and confirm it moves smoothly and returns firmly.
• If any pulley is noisy/rough, stop and replace that component before installing the new belt.

Step 8: Route the new belt

• Route the new belt around the pulleys following your photo/diagram, leaving the easiest pulley for last.
• Make sure every rib sits fully in the pulley grooves; misalignment will shred the belt quickly.
• Use your flashlight to check every pulley edge.

Step 9: Apply tension and seat the belt

• Rotate the tensioner again using the serpentine belt tool (specialty) or 1/2" drive breaker bar.
• Slip the belt onto the final pulley, then slowly release the tensioner.
• Re-check belt alignment on all pulleys by sight and by lightly “walking” the belt with your fingers (engine OFF).

Step 10: Reinstall underbody panels

• Reinstall the underbody panels and fasteners using the 8mm socket, 10mm socket, and Torx bit socket set.
• Tighten small underbody fasteners snugly with a torque wrench (10–100 Nm range) if you have specs available for the panel hardware; otherwise do not over-tighten into plastic.

Step 11: Lower the car

• Use the floor jack (rated 3-ton minimum) to lift slightly, remove the jack stands (rated 3-ton minimum), then lower to the ground.
• Remove the wheel chocks.

---

✅ After Repair

• Start the engine and watch the belt for 30–60 seconds; it should run centered with no wandering.
• Listen for chirping/squealing; if present, shut off and re-check pulley alignment and routing.
• Take a short test drive, then re-check for any underbody panel looseness or new noises.

---

💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $45-$110 (parts only)

You Save: $175-$340 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.0 hours.

---

🎯 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.