2017 Toyota Tacoma Serpentine Belt Routing & Part Numbers

Quick Answer

For most 2017 Toyota Tacoma models, especially those with the 3.5L V6 engine, here are the key details for your serpentine belt:

• Belt Length: Approximately 2035mm (80.1 inches)
• Rib Count: 6-rib
• OEM Belt PN: 90916-A2002
• Aftermarket Cross-references:
  • Gates K060801
  • Dayco 5060800
  • Continental Elite 4060800
• Auto-Tensioner PN: 16620-0P020
• Idler Pulley PN: 16603-0P030

Note: Part numbers can vary based on engine size and specific vehicle configurations. Always verify part numbers with your VIN at a Toyota dealership or trusted auto parts supplier.

Belt Routing

The serpentine belt on your 2017 Toyota Tacoma (3.5L V6) plays a critical role in powering essential accessories like the alternator, power steering pump, air conditioning compressor, and water pump. Before you remove your old belt, it is highly recommended to take a clear photograph of the existing belt routing. This will serve as an invaluable reference during reinstallation.

Here's a typical routing path description, assuming a clockwise rotation from the crankshaft pulley:

1. Begin at the crankshaft pulley (the largest pulley at the bottom front of the engine).
2. From the crankshaft, the belt typically goes up to the A/C compressor pulley.
3. From the A/C compressor, the belt may route over an idler pulley (a smooth pulley that guides the belt).
4. Next, the belt wraps around the alternator pulley (usually located higher up on the engine, charging the battery).
5. From the alternator, it often descends to the power steering pump pulley.
6. The belt then typically goes to the water pump pulley.
7. Finally, the belt routes to the automatic tensioner pulley, which maintains proper belt tension.

Remember, minor variations can exist, even within the same model year, so your photo is your best friend!

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2017 Toyota Tacoma is a straightforward task for those comfortable with basic automotive repairs. You will primarily need a serpentine belt tool or a long 3/8" drive breaker bar.

1. Locate the Automatic Tensioner: This component will have a square opening for your serpentine belt tool or breaker bar.
2. Relieve Tension: Insert your tool into the square opening on the tensioner and rotate it counter-clockwise (or sometimes clockwise, depending on the engine) to relieve tension on the belt. This will allow the belt to become loose.
3. Remove the Old Belt: While holding tension off the belt, carefully slide the old belt off one of the pulleys, then completely remove it from all pulleys.
4. Compare: Before installing the new belt, compare it to the old one to ensure they are the same length and rib count.
5. Route the New Belt: Following your photograph (or the diagram above), carefully route the new belt around all pulleys, leaving the tensioner pulley for last or second to last, as this is where you will create slack.
6. Apply Tension: Once the belt is correctly routed on all other pulleys, return your tool to the automatic tensioner and rotate it again to create slack. Slide the belt over the tensioner pulley.
7. Release Tensioner: Slowly release the tensioner, allowing it to apply pressure to the new belt. Double-check that the belt is properly seated in all pulley grooves.
8. Inspect: Give the belt a good visual inspection to ensure it's correctly aligned and not twisted anywhere.

Replacement Interval

Toyota generally recommends inspecting the serpentine belt at every service interval (typically every 5,000 to 10,000 miles) and replacing it as needed. Most serpentine belts are designed to last between 50,000 to 100,000 miles, but this can vary significantly based on driving conditions, climate, and belt material. It's wise to replace the belt proactively when it shows signs of wear, rather than waiting for it to fail.

Signs of a Failing Belt or Tensioner

Ignoring a worn serpentine belt or a faulty tensioner can lead to a breakdown, as critical engine accessories will stop functioning. Here are common signs to watch for:

• Squealing Noises: A loud squealing or chirping noise, especially upon startup or when accelerating, is a classic sign of a worn, loose, or misaligned belt. It can also indicate a failing pulley bearing.
• Cracks or Fraying: Visible cracks, fraying, missing ribs, or glazing (a shiny, hardened appearance) on the belt surface are clear indicators that it needs replacement.
• Loss of Power Steering or A/C: If your power steering suddenly becomes difficult or your A/C stops blowing cold air, the belt may have slipped or broken.
• Overheating: A broken belt means the water pump isn't spinning, leading to rapid engine overheating.
• Battery Light On: If the serpentine belt breaks, the alternator will stop charging the battery, causing the battery warning light on your dashboard to illuminate.
• Vibrations or Wobbling from Pulleys: This can indicate a failing tensioner or idler pulley bearing. A faulty tensioner might also cause the belt to slip or track incorrectly.

If you notice any of these symptoms, it's crucial to inspect your belt and tensioner immediately.

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