2023 Toyota Tundra: Serpentine Belt Routing & Replacement

Quick Answer

• Belt Length & Rib Count: 2321mm (91.38 inches), 8-rib
• OEM Belt Part Number: 90916-02793
• Aftermarket Belt Cross-References: Gates K080913, Dayco 5080915, Continental 4080913
• Auto-Tensioner Part Number: 16620-F0010
• Idler Pulley Part Number: 16604-F0010 (upper)

Belt Routing

Before you begin, we strongly recommend taking a photo of the current serpentine belt routing to ensure you can properly reinstall the new one. The 2023 Toyota Tundra with the V35A-FTS 3.4L V6 engine follows this belt routing path:

1. Starts at the crankshaft pulley at the bottom center of the engine.
2. Wraps up and around the A/C compressor on the lower passenger side.
3. Goes up to the idler pulley located above the A/C compressor.
4. Travels across to the alternator on the upper driver's side.
5. Loops down and around the power steering pump pulley, positioned below the alternator.
6. Moves across to the water pump pulley in the center of the engine.
7. Finally, the belt goes under the auto-tensioner, located on the passenger side, which maintains proper belt tension.

How to Replace the Serpentine Belt

Replacing the serpentine belt on a 2023 Tundra is a manageable task for a DIYer. You will need a serpentine belt tool or a 3/8" breaker bar to release the tension on the belt.

1. Locate the auto-tensioner: Find the auto-tensioner on the passenger side of the engine.
2. Release tension: Insert your serpentine belt tool or breaker bar into the designated opening on the tensioner arm. Rotate the tensioner to release the belt's tension.
3. Remove the old belt: Carefully slip the old belt off the pulleys.
4. Install the new belt: Following the routing path you photographed earlier (and our text-based guide), carefully thread the new belt onto all the pulleys except for the tensioner.
5. Re-engage tensioner: Release the tensioner tool to apply tension to the new belt. Make sure the belt is properly seated in the grooves of each pulley.

Replacement Interval

Toyota does not specify a strict replacement interval for the serpentine belt on the 2023 Tundra. However, as a general rule, it is wise to inspect the belt during routine oil changes and plan to replace it every 60,000 to 100,000 miles, or if you notice any signs of wear.

Signs of a Failing Belt or Tensioner

It is important to be aware of the signs of a failing serpentine belt or tensioner to avoid a breakdown. If the belt snaps, you will lose power to crucial components like the alternator, power steering, and water pump, which can cause the engine to overheat and the battery to die.

• Squealing or chirping noises: This is often the first sign of a worn or loose belt.
• Visible wear: Look for cracks, fraying, or glazing on the belt. Any visible damage means it is time for a replacement.
• Tensioner noise: A grinding or rattling noise coming from the tensioner indicates that the bearing is failing.
• "Bouncing" tensioner arm: A tensioner arm that visibly jumps or bounces while the engine is running is a sign that the tensioner is weak and needs to be replaced.

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