F-150 - Serpentine Belt Replacement 🔧

I’ll lay this out step-by-step for your 2016 5.0L so it’s beginner-friendly.

Tools & Parts Needed 🧰

• 🔧 Serpentine belt (correct length for 5.0L with your options – match by engine & A/C at the parts counter)
• 🔧 3/8" or 1/2" drive ratchet (the handle you attach sockets to)
• 🔧 Serpentine belt tool or long breaker bar (a long handle that gives extra leverage to move the tensioner)
• 🔧 Socket set (metric; 8–15 mm will cover what you need)
• 🔧 Flat trim tool or flat screwdriver (to pop plastic clips if needed)
• 🔧 Work light (seeing the pulleys clearly is important)
• 🔧 Gloves & safety glasses

Safety First ⚠️

• ⚠️ Engine OFF and cool – never work around the belt with the engine running.
• ⚠️ Battery negative cable disconnected is a good idea if you’re new:
  • Use a 10 mm wrench, loosen the negative (-) terminal, and move it aside.
• ⚠️ Keep fingers and clothing clear of pulleys and sharp edges.

F-150 - Belt Routing Overview 🧵

From the factory there is usually a belt routing diagram sticker on the radiator support or underside of the hood.

• 🔍 If you see it, take a clear photo before starting.
• 🔍 If not, draw a simple sketch of how the belt runs over/under each pulley:
  • Smooth pulleys = belt runs on the smooth back side.
  • Ribbed pulleys = belt ribs sit in the grooves.

On the 5.0L, the belt runs around: crankshaft pulley, alternator, power steering, A/C compressor, idler(s), and automatic tensioner.

Step 1 – Access the Belt 👀

• 🧰 Park on level ground, set the parking brake, and open the hood.
• 🧰 Remove any plastic engine cover if fitted:
  • Usually pulls up off rubber grommets; if bolts are present, remove with 8–10 mm socket.
• 🧰 If needed for space, remove the air intake tube from the airbox to the throttle body:
  • Loosen the hose clamps (usually 7–8 mm or flat screwdriver).
  • Unplug the MAF sensor connector carefully (press tab and pull).
  • Lift the tube out and set aside.

Step 2 – Locate the Belt Tensioner 🔄

The belt tensioner is a spring-loaded pulley that keeps the belt tight.

• 🔍 On the 5.0L, it’s on the front of the engine, slightly toward the passenger side, with a pulley and a square hole or bolt head for your tool.
• 🔍 Look for:
  • Either a 3/8" or 1/2" square hole in the arm (for your ratchet/belt tool), or
  • A bolt head in the center of the pulley (often 15 mm) where you put your socket.

Step 3 – Relieve Tension and Remove Old Belt 🧯

• 🧰 Insert your ratchet or belt tool into the tensioner:
  • Use the correct square hole or socket on the pulley bolt.
• 🧰 Rotate the tensioner in the direction that loosens the belt:
  • On this engine, you typically pull the handle toward the driver side (but watch the belt – you’ll see it slacken).
• 🧰 While holding the tensioner released, slide the belt off one easy-to-reach smooth pulley (often an idler at the top).
• 🧰 Slowly let the tensioner return to its rest position. Don’t let it snap back hard.
• 🧰 Now remove the belt completely from all pulleys and pull it out of the engine bay.

Step 4 – Compare Old and New Belt 📏

• 📌 Lay the old and new belts side by side on the ground.
• 📌 Check:
  • Same number of ribs (grooves).
  • Very similar length (a tiny difference is normal; big difference is wrong part).

Step 5 – Route the New Belt (Except One Pulley) 🧩

• 🧰 Using your diagram/photo, start routing the new belt:
  • Begin at the crankshaft pulley (big one at the bottom).
  • Work your way around the lower accessories (A/C, power steering).
  • Then around the alternator and idler pulleys.
• 🧰 Make sure:
  • Belt ribs sit fully in the grooves on ribbed pulleys.
  • The back (smooth side) runs on smooth pulleys.
• 🧰 Leave the belt off one easy-to-reach smooth pulley at the top (often an idler). This will be your last pulley to slip it over.

Step 6 – Apply Tension and Seat the Belt 💪

• 🧰 Reinstall your ratchet/belt tool on the tensioner.
• 🧰 Rotate the tensioner again to create slack in the belt.
• 🧰 With your other hand, slip the belt onto the last pulley you left for last.
• 🧰 Slowly release the tensioner so it tightens the belt.
• 🧰 Double-check:
  • Belt is centered on every pulley.
  • No ribs hanging off the edge.
  • Routing matches your diagram exactly.

Step 7 – Reassemble and Final Checks ✅

• 🧰 Reinstall the air intake tube:
  • Slide onto throttle body and airbox.
  • Tighten hose clamps snug (about 35–45 in-lb – firm but not crushing).
  • Reconnect the MAF sensor plug until it clicks.
• 🧰 Reinstall engine cover if removed (push onto grommets or tighten bolts snug).
• 🧰 Reconnect the battery negative terminal and tighten the 10 mm nut snug (around 62 in-lb / ~7 N·m – don’t overtighten).
• 🧰 Before starting, visually inspect the belt one more time.
• 🧰 Start the engine and let it idle:
  • Watch the belt for 30–60 seconds.
  • It should run smooth, no wobble, no squeal.

Torque & Notes 📎

• 🔧 Tensioner pulley bolt – if you had to remove it (usually you don’t): about 35–40 ft-lb (Ford spec varies slightly by supplier; snug plus a bit more with a 3/8" ratchet if you don’t have a torque wrench).
• 🔧 Any bracket/cover bolts – typically 7–9 ft-lb for small 8–10 mm bolts.

Tips & Tricks 💡

• 💡 If the belt keeps slipping off while routing, use a small bungee cord or a helper to hold it on one pulley while you work around.
• 💡 If you hear squealing after install, recheck that the belt is fully seated in every groove and that no pulley is oily or dirty.
• 💡 A long serpentine belt tool makes this job much easier than a short ratchet because of the extra leverage.

If you want, tell me if your truck has A/C and I can confirm the exact belt routing and part style you need. HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need!