2023 Toyota Tacoma Serpentine Belt Routing & Replacement

Quick Answer

• Belt Length: 2105 mm (82.7 inches)
• Rib Count: 6-rib
• OEM Belt Part Number: 90916-A2002
• Aftermarket Cross-references:
  • Gates K060827
  • Dayco 5060827
  • Continental Elite 4060827
• Auto-Tensioner Part Number: 16620-0P030
• Idler Pulley Part Number: 16603-0P030

Belt Routing

The 2023 Toyota Tacoma, equipped with the 3.5L V6 engine, uses a single serpentine belt to drive all its accessories. Before you begin any work, it is highly recommended to take a clear photograph of the current belt routing. This will serve as an invaluable reference during reinstallation.

Here's the typical routing path for the 3.5L V6 engine:

1. Begin at the Crankshaft Pulley (the largest pulley at the bottom, closest to the engine block).
2. From the crankshaft, the belt goes up and to the left to the A/C Compressor Pulley (located on the lower passenger side).
3. From the A/C compressor, the belt travels vertically upwards to the Idler Pulley (a smooth pulley, usually above the A/C compressor).
4. The belt then goes horizontally to the left from the idler pulley to the Alternator Pulley (located high on the passenger side).
5. From the alternator, the belt routes down and slightly left to the Power Steering Pump Pulley (positioned below the alternator).
6. Next, the belt moves horizontally to the left from the power steering pump to the Water Pump Pulley (located on the driver's side, often with a fan attached in some applications, though not directly driven by the serpentine belt in this configuration).
7. Finally, the belt runs down from the water pump and around the Automatic Tensioner Pulley (usually spring-loaded, located below and to the right of the water pump), which maintains proper belt tension, before returning to the crankshaft pulley.

How to Replace the Serpentine Belt

Replacing the serpentine belt on your 2023 Toyota Tacoma is a straightforward procedure that can be done with basic tools.

1. Safety First: Ensure the engine is off and cool. Disconnect the negative terminal of the battery for added safety.
2. Locate the Tensioner: Identify the automatic belt tensioner. It will have a 3/8-inch square drive opening or a hexagonal bolt head.
3. Relieve Tension: Insert a serpentine belt tool or a 3/8-inch drive breaker bar into the square opening of the tensioner. Rotate the tensioner counter-clockwise (or clockwise, depending on the design – observe which way loosens the belt) to relieve the tension on the belt. While holding the tensioner in the loosened position, carefully slip the old belt off one of the pulleys.
4. Remove Old Belt: Once slack, completely remove the old serpentine belt from all the pulleys.
5. Route New Belt: Using the photograph you took earlier (or the diagram above), meticulously route the new belt around all the pulleys, leaving the tensioner pulley for last or second to last. Ensure the ribs of the belt are properly seated in the grooves of the ribbed pulleys.
6. Final Tensioning: With almost all the belt in place, use your serpentine belt tool or breaker bar to again relieve the tensioner and slip the new belt over the tensioner pulley. Slowly release the tensioner, allowing it to apply proper tension to the new belt.
7. Double-Check: Visually inspect the entire belt path to confirm it is correctly seated on all pulleys and that no part of the belt is pinched or misaligned.
8. Start Engine: Reconnect the battery. Start the engine briefly and listen for any unusual noises. Turn off the engine and re-inspect the belt for proper alignment.

Replacement Interval

Toyota generally recommends inspecting the serpentine belt at every service interval (typically 5,000 to 10,000 miles) and replacing it if signs of wear are present. As a general guideline, a serpentine belt typically lasts between 60,000 to 100,000 miles under normal driving conditions. However, various factors like extreme temperatures, harsh driving, and oil leaks can accelerate wear. It's always best to follow your owner's manual recommendations and a visual inspection.

Signs of a Failing Belt or Tensioner

Ignoring a failing serpentine belt or tensioner can lead to a breakdown, as it drives crucial components like the alternator, power steering pump, and A/C compressor. Here are the warning signs to look out for:

• Squealing or Chirping Noises: This is the most common sign. A loose, worn, or misaligned belt will often squeal, especially on startup, during turns (power steering), or when the A/C is engaged. A failing tensioner can also cause these noises if it's not maintaining proper tension.
• Visible Cracks, Fraying, or Glazing: Inspect the belt's surface. Cracks, missing chunks, or a shiny, glazed appearance on the ribbed side indicate significant wear and reduced grip. Fraying along the edges is also a clear sign for replacement.
• Loss of Power Steering, A/C, or Charging System Failure: If the belt breaks, you'll immediately lose power steering assist, the air conditioning will stop blowing cold, and the battery warning light will illuminate (as the alternator is no longer being driven to charge the battery). Your engine may also overheat if the water pump stops circulating coolant.
• Vibration or Wobble from Pulleys: A failing tensioner or idler pulley might exhibit excessive wobble or vibration when the engine is running. This can lead to premature belt wear.
• Inoperative Accessories: Any accessory driven by the serpentine belt, if it