2024 Toyota Tundra Serpentine Belt Routing & Part Numbers

As an ASE-certified master technician, I know that routine maintenance is the key to keeping your truck on the road and out of the shop. The 2024 Toyota Tundra, powered by the robust 3.4L V35A-FTS Twin-Turbo V6 (standard i-FORCE and hybrid i-FORCE MAX), utilizes a single serpentine belt to drive its vital engine accessories.

Whether you are performing a preventative replacement or dealing with a squealing belt, this reference guide provides all the part numbers, routing details, and step-by-step procedures you need to get the job done right on your 2024 Toyota Tundra.

Quick Answer: Part Numbers & Specifications

Before you open the hood, make sure you have the correct replacement parts. The 2024 Tundra's 3.4L twin-turbo V6 uses a modern 6-rib micro-V belt. (Note: Always verify exact part numbers with your VIN, especially between standard and hybrid i-FORCE MAX powertrains).

• Rib Count: 6-rib
• Belt Length: Approximately 78.5 inches (varies slightly by exact trim/alternator package)
• OEM Toyota Belt Part Number: 90916-02781 (Standard V35A-FTS)
• Aftermarket Cross-References: Gates K060785, Dayco 5060785, Continental Elite 4060785
• OEM Auto-Tensioner Assembly: 16620-F0010
• OEM Idler Pulley: 16604-F0010

Belt Routing

The 2024 Tundra features an electric power steering (EPS) rack, meaning there is no power steering pump driven by the belt. Because modern engine bays are incredibly tight and the routing path can be confusing once the old belt is removed, always take a clear photograph of your existing belt routing before removal.

Since we cannot render an image here, follow this text-based step-by-step routing path for the standard 3.4L V6:

1. Start by looping the belt down and around the bottom of the Crankshaft Pulley.
2. Bring the belt straight up from the right side of the crank to wrap over the top of the Water Pump Pulley.
3. From the water pump, route the belt down and under the Idler Pulley.
4. Pull the belt up from the idler to wrap around the Alternator.
5. Bring the belt across the engine downwards to wrap around the A/C Compressor.
6. Finally, route the back (smooth side) of the belt over the Auto-Tensioner Pulley before connecting back to the crankshaft.

Double-check that the ribbed side of the belt sits perfectly into the grooves of the crank, alternator, and A/C compressor, while the smooth side rests against the tensioner and smooth idlers.

How to Replace the Serpentine Belt

Replacing the serpentine belt on the 2024 Tundra is straightforward, provided you have the right leverage.

Tools required:

• Long-handled serpentine belt tool or a standard 3/8" drive breaker bar (depending on clearance)
• Socket set (typically 14mm or 15mm for the tensioner bolt head)
• Flashlight

Step-by-Step Procedure:

1. Locate the tensioner: Find the spring-loaded automatic belt tensioner on the front of the engine block.
2. Release the tension: Insert your serpentine belt tool or breaker bar into the tensioner pulley bolt (or square drive slot). Rotate the tensioner counter-clockwise (or away from the belt) to relieve the spring pressure.
3. Remove the old belt: While holding the tensioner open, slip the belt off the easiest accessible pulley (usually the idler or alternator). Carefully release the tensioner back to its resting position.
4. Route the new belt: Follow the routing path described above or your reference photograph. Leave the tensioner pulley for last.
5. Install the new belt: Rotate the tensioner open again, slip the smooth side of the new belt over the tensioner pulley, and gently release the tensioner so it clamps down on the belt.
6. Inspect: Ensure the belt is perfectly seated in the grooves of all ribbed pulleys. A misaligned belt will shred upon startup.

Replacement Interval

Toyota generally recommends inspecting the serpentine belt every 15,000 miles or 18 months. As a rule of thumb, modern EPDM (Ethylene Propylene Diene Monomer) belts should be replaced every 60,000 to 90,000 miles, or every 5 to 7 years, whichever comes first. You should also replace the auto-tensioner and idler pulleys every second belt change (roughly 120,000 miles), as the bearings will wear out.

Signs of a Failing Belt or Tensioner

Do not wait for a complete failure to address your drive belt. Look out for these common warning signs:

• Squealing or Chirping: High-pitched noises, especially on cold starts or when the A/C kicks on, indicate a glazed belt or weak tensioner spring.
• Visible Wear: Look for deep cracks in the ribs, missing chunks of rubber, or frayed edges.
• Accessory Issues: A slipping belt can cause random battery warning lights (low alternator output) or poor A/C performance.
• Tensioner Bounce: While the engine is idling, watch the auto-tensioner. Excessive vibrating or bouncing means the internal dampener has failed and the assembly needs replacing.

If you don't have the tools or time to tackle this maintenance item yourself, don't risk a breakdown on the highway. Find a trusted shop on Repairius.